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List of Freshwater Fishes reported from Thailand
n = 879
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Table 1: 826 species currently present in the country/island (endemic, native, introduced, reintroduced);
Table 2: 31 species possibly present in the country/island (stray, questionable);
Table 3: 22 species demonstrated to be absent in the country/island (extirpated, not established, misidentification, error).
Table 4: 879 species reported from the country/island altogether.
Table : 879 .
     
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Family Species Author Info Occurrence Common names Abundance Max length Maturity Remark Photo
Cyprinidae Aaptosyax grypus Rainboth, 1991 Fr, Br, Thr native  Giant salmon carp (English)  130 cm SL male/unsexed  Known from the Mekong River (Ref. 26336). Occurs in Loei but reported that is not found there anymore indicating that the present day distribution may be significantly reduced (Ref. 37770). Found at Khong Chiam Dist., Ubon Ratchathani Prov (Ref. 33021); also from Mukda Han and Nakhon Phanom (Ref. 37773). Threatened due to habitat loss and overfishing (Ref. 58784). Museum: Mekong river, Thailand at Ubotrachatance, BMNH 1989.6.30.2a., BMNH 1989.6.30.1-2 (Ref. 31982). Also Ref. 10431, 37770, 43281, 94476. Status of threat: Critically Endangered (Ref. 58784). 
Gobionidae Abbottina rivularis (Basilewsky, 1855) Fr introduced   18.90 cm TL male/unsexed  Introduced into the Mekong basin in Yunnan, China from where it spreads to northern Thailand (Ref. 43281). Recorded from the Mekong River at Chiangkong, Chiangrai Province. Collected at a depth of 0.8-1.0 m over a sand and gravel bottom covered with green algae (Ref. 12819). Also Ref. 26336. 
Nemacheilidae Acanthocobitis botia (Hamilton, 1822) Fr native   14.87 cm TL male/unsexed  Known from the Mae Khlong basin. Recorded from Kanchanaburi (Ref. 37773). 
Nemacheilidae Acanthocobitis pictilis Kottelat, 2012 Fr native    Known from the Mae Klong drainage (Ref. 90177).  No picture yet.
Cobitidae Acanthopsoides delphax Siebert, 1991 Fr native   6.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya and Salween basins (Ref. 27732). Known from the Khorat Plateau (Ref. 12693); also from Phrae, Chiang Mai and Mae Hong Son (Ref. 37773). Also Ref. 26336, 27732, 37773, 26580. 
Cobitidae Acanthopsoides gracilentus (Smith, 1945) Fr native   6.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya and Maeklong basins (Ref. 26336) and in Khorat Plateau (Ref. 12693). Collected at Mae Nam Fang, 35 km south of Fang on road to Chiang Mai, Mekong basin, Chiang Mai Province (Ref. 39226); also from Phrae, Chiang Rai, Nan, Chanthaburi, Kanchanaburi, Prachin Buri, Phitsanulok and Nakhon Ratchasima (Ref. 37773). Also Ref. 27732, 26580. 
Cobitidae Acanthopsoides gracilis Fowler, 1934 Fr native   5.40 cm SL male/unsexed  Found in the Chao Phraya (Ref. 12041, 26580), Chieng Mai (Ref. 33021) and Mekong basins (Ref. 2091). Museum: Chieng Mai, ANSP 56999 (holotype, 4.43 cm SL) (Ref. 28631); also from Chiang Rai (Ref. 37773).  No picture yet.
Cobitidae Acanthopsoides hapalias Siebert, 1991 Fr native   6.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 26336, 27732). Also known from the Chao Phrya basin (Ref. 12693). Found in Lam Nam Mun, 2 km downstream from Phimai, 15° 14' N, 102° 31' E, Nakhon Ratchasima Prov (Ref. 33021); also from Nakhon Ratchasima, Ubon Ratchathani, Nong Khai, Surin and Roi Et. (Ref. 37773). Also Ref. 27732. 
Cobitidae Acanthopsoides molobrion Siebert, 1991 Fr native   4.50 cm SL male/unsexed  Found in the Mekong River. Also recorded from Surat Thani (Ref. 37773). 
Cobitidae Acantopsis dialuzona Van Hasselt, 1823 Fr native  Pla kluay (Thai), Pla chon sai (Thai), Pla moo (Thai), Pla rak kluay (Thai), Pla sai (Thai), ปลากล้วย (Thai), ปลาช่อนทราย (Thai), ปลาทราย (Thai), ปลารากกล้วย (Thai), ปลาหมู (Thai), Long nosed loach (English)  25.00 cm SL male/unsexed  Found in the Mekong, Chao Phraya, Maeklong and Southeast Thailand river systems (Ref. 26336); also from Phrae, Khon Kaen, Phitsanulok, Kemarat (Ubon Ratchathani), Nong Khai, Nakhon Ratchasima, Trang, Surat Thani, Nakhon Si Thammarat, Nakhon Sawan, Ratchaburi, Chanthaburi, Uthai Thani, Kanchanaburi, Yala, Prachin Buri and Surat Thani (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Museum: Mekong river at Chiang Khan CAS 63027 (Ref. 5515). Also Ref. 1632, 4832, 4537, 7050, 9648, 26580, 36654. 
Cobitidae Acantopsis dinema Boyd & Page, 2017 Fr native  Peppered horseface loach (English)  11.67 cm SL male/unsexed  Known from the tributaries of the Mekong River draining the Khorat Plateau and Mekong Delta ecoregions and from Songkhram River in eastern Thailand (Ref. 116755).  No picture yet.
Cobitidae Acantopsis ioa Boyd & Page, 2017 Fr native   13.20 cm SL male/unsexed  Widely distributed in the mainstem Mekong River (Ref. 116755).  No picture yet.
Cobitidae Acantopsis rungthipae Boyd, Nithirojpakdee & Page, 2017 Fr native  Piebald horseface loach (English)  11.97 cm SL male/unsexed  Known from Tapi, Mae Khlong, Chao Phraya, Bang Pakong, Welu and Mekong River basins (Ref. 116755).  No picture yet.
Cobitidae Acantopsis thiemmedhi Sontirat, 1999 Fr native   11.76 cm SL male/unsexed  Found in the Mae Preeg stream of Lampang Province, in the Huey Nam Khoon and Huey Song Thang; tributaries of Huey Tab Salao within the Huey Kha Khaeng Wildlife Sanctuary, Uthai Province and Chao Phraya river in Tambon Tha Nam Oi, Amphur Payuhakiri of Nakorn Sawan Province (Ref. 48303)). Type locality, Huey Nam Khoon, Huey Kha Khaeng Wildlife Sanctuary, Amphur Lan Sak, Uthai Thani Prov., elev. 200 m. KUMF-3131 (Ref. 48303). 
Gobiidae Acentrogobius chlorostigmatoides (Bleeker, 1849) Fr, Br native   12.40 cm TL male/unsexed  Reported fro Si Racha (Chon Buri), Tale Sap Songkhla, Samut Prakan Lem Sing (Chanthaburi), Bang Pakong river (Chachoengsao) and Tha Chin river (Samut Sakhon) (Ref. 37773). 
Gobiidae Acentrogobius viridipunctatus (Valenciennes, 1837) Fr, Br native  Buhuato (Thai), บู่หัวโต (Thai)  16.50 cm TL male/unsexed  Reported from lower Chao Phraya river (Ref. 37773). Also found in brackish waters (Ref. 11344). Also Ref. 7050, 52823. 
Acheilognathidae Acheilognathus deignani (Smith, 1945) Fr native   5.20 cm SL male/unsexed  Known from the Mekong River. Also Ref. 37773. 
Acheilognathidae Acheilognathus kyphus (Mai, 1978) Fr questionable    The type locality of this species seems uncertain. It is known to be in creeks in northern Thailand (Ref. 97102). Kottelat 2013 (Ref. 94476) indicated that the type locality is in creeks in northern Vietnam, but this is probably in Ky Phu stream, Dai Tu District in Thai Nguyen Province.  No picture yet.
Soleidae Achiroides leucorhynchos Bleeker, 1851 Fr, Br native   8.00 cm SL male/unsexed  Known from Klong Sok, Bandon (Surat Thani) and Nakhon Phanom (Ref. 37773). Also Ref. 12693. 
Soleidae Achiroides melanorhynchus (Bleeker, 1850) Fr, Br native   14.00 cm SL male/unsexed   
Akysidae Acrochordonichthys gyrinus Vidthayanon & Ng, 2003 Fr, Thr endemic  Falcate chameleon catfish (English)  10.00 cm TL male/unsexed  Known only from Nan basin (Ref. 58784). Threatened due to habitat loss (Ref. 58784). Museum: Phitsanulok Province, Yom River at Prompiram, NIFI 2645, (holotype, 7.17 cm SL) (Ref. 50585). Status of threat: Endangered (Ref. 58784). 
Akysidae Acrochordonichthys rugosus (Bleeker, 1846) Fr native   11.00 cm SL male/unsexed  Known from the narathiwat Prov.: Sungai Kolok, Mae Nam Sungai Kolok at Ban Sac and Mae Nam Sai Buri at Sukhirin; and in Pattani River at Yala (Ref. 37794). 
Akysidae Acrochordonichthys septentrionalis Ng & Ng, 2001 Fr, Thr native  Maeklong chameleon catfish (English)  10.13 cm SL male/unsexed  Known from the Mae Khlong River drainage (Ref. 37794). Threatened due to habitat loss (Ref. 58784). Museum: Kwae Noi River, Kanchanaburi Prov., NIFI 3128 (holotype of A. septentrionalis, 10.13 cm SL ) (Ref. 37794). Status of threat: Endangered (Ref. 58784).  No picture yet.
Akysidae Akysis hendricksoni Alfred, 1966 Fr native   4.87 cm SL male/unsexed  Known from southern Peninsular Thailand. 
Akysidae Akysis maculipinnis Fowler, 1934 Fr native   3.13 cm SL male/unsexed  Known from the Mekong and Chao Phrya basins as well as basins around the upper Gulf of Thailand; also from Chanthaburi (Ref. 37773). Also Ref. 30226, 52824. 
Akysidae Akysis pictus Günther, 1883 Fr questionable   5.92 cm SL male/unsexed  Reported from Tenasserim (Salween river) (Ref. 37773). Outside distributional range, occurrence needs further verification. 
Akysidae Akysis pulvinatus Ng, 2007 Fr native   2.96 cm SL male/unsexed  Found only in the upper Tapi River drainage and hillstreams flowing into the Andaman Sea on the western half of the Isthmus of Kra (Ref. 59363). 
Akysidae Akysis recavus Ng & Kottelat, 1998 Fr native   4.00 cm SL male/unsexed  Known from the western Chao Phraya basin. 
Akysidae Akysis varius Ng & Kottelat, 1998 Fr native   4.00 cm SL male/unsexed  Known from the Mekong basin at Mun River in Nakhon Ratchasima, Ubon Ratchathani (Ref. 30226). Also Ref. 43281. 
Cyprinidae Albulichthys albuloides (Bleeker, 1855) Fr, Br, Fi, Thr native  Paled barb (English)  30.00 cm SL male/unsexed  Known from the Maeklong, Chao Phraya and Mekong rivers (Ref. 26336); also from Bangkok, Samut Prakan and Nakhon Nayok (Ref. 37773). Threatened due to habitat loss (Ref. 58784). Also Ref. 2091, 7050, 26580, 36654, 43281. Status of threat: Endangered (Ref. 58784). 
Batrachoididae Allenbatrachus grunniens (Linnaeus, 1758) Fr, Br, M native  Up (Thai), อุบ (Thai)  30.00 cm TL male/unsexed  Found in Chao Phraya basin (Ref. 12041); also from Bangkok, Nonthaburi, Bang Pakong river (Chachoengsao), Ko Kram (Chon Buri) and Songkhla (Ref. 37773). Also Ref. 12041, 52823, 90102. 
Cyprinidae Altigena discognathoides (Nichols & Pope, 1927) Fr native   33.00 cm TL male/unsexed  Occurs in the Mekong River (Ref. 37773). 
Cyprinidae Altigena lippa (Fowler, 1936) Fr native   28.40 cm SL male/unsexed    No picture yet.
Cyprinidae Altigena sinkleri (Fowler, 1934) Fr native   6.91 cm SL male/unsexed  Known from the Chao Phraya basin. Also recorded from Mae Tang (Chiang Mai) (Ref. 37773). Also Ref. 26580, 27732. 
Ambassidae Ambassis buruensis Bleeker, 1856 Fr native   8.20 cm TL male/unsexed  Reported from Bangkok, Keng Sok (Surat Thani) and Klong Wan (Prachuap Khiri Khan) (Ref. 37773). 
Ambassidae Ambassis gymnocephalus (Lacepède, 1802) Fr, Br, M native   16.00 cm TL male/unsexed  Reported from Paknam (Samut Prakan), Bangkok, Tha Chin river (Samut Sakhon), Pak Payoon (Phatthalung), Tale Sap, Klong Wan (Prachuap Khiri Khan), Songkhla and Si Racha (Chon Buri) (Ref. 37773). 
Ambassidae Ambassis miops Günther, 1872 Fr native   10.30 cm TL male/unsexed  Reported from Pak Poon (Nakhon Si Thammarat), Banghia and Paknam (Samut Prakan) (Ref. 37773). 
Botiidae Ambastaia nigrolineata (Kottelat & Chu, 1987) Fr, Or, Thr native  Mekong clawn loach (English)  8.00 cm SL male/unsexed  Occurs in the Mekong basin. Some are collected as aquarium fish. Threatened due to overfishing (Ref. 58784). Also Ref. 43281. Status of threat: Endangered (Ref. 58784). 
Botiidae Ambastaia sidthimunki (Klausewitz, 1959) Fr, Pr, Or, Thr native  Dwarf clawn loach (English), Dwarf loach (English) occasional (usually not seen) 5.50 cm SL male/unsexed  Known from Chao Phraya, Mekong and Maeklong basins (Ref. 26336). Recorded from Kanchanaburi (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 1632, 12041, 12217, 37773, 26580. Status of threat: Critically Endangered (Ref. 58784). 
Amblycipitidae Amblyceps caecutiens Blyth, 1858 Fr native   7.30 cm SL male/unsexed  Known from the Salween and Mekong river drainages. Type locality, Huang R. tributary, Mekong R. basin, Loei Prov. (Ref. 37785).  No picture yet.
Amblycipitidae Amblyceps foratum Ng & Kottelat, 2000 Fr native   8.51 cm SL male/unsexed  Known from the southern peninsular Thailand (Khlong Sok at Ban Khlong Sok, Surat Thani Prov.) and SE Thailand (provinces of Trat and Chantaburi) (Ref. 37785). 
Amblycipitidae Amblyceps mangois (Hamilton, 1822) Fr native   12.50 cm SL male/unsexed  Occurs in the Mekong basin at Nam Man about 2 km upstream of Amphoe Dan Sai in Loei Province (Ref. 39226); also from Chumphon, Tak, Nakhon Nayok, Surat Thani, Salween river and its tributaries, Nakhon Ratchasima, Nakhon Si Thammarat, Chanthaburi, Phrae and Phitsanulok (Ref. 37773). Also Ref. 1632, 4833, 41236. 
Amblycipitidae Amblyceps platycephalus Ng & Kottelat, 2000 Fr native   12.00 cm NG male/unsexed  Known from a single specimen caught from the Salween River drainage in NW Thailand. Type locality, immediately downstream of Nam Mae Sa-Nga at Ban Yang Top Sole, Nam Mae Pai basin, Mae Hong Son Prov. (Ref. 37785). 
Amblycipitidae Amblyceps protentum Ng & Wright, 2009 Fr native    Known from the Salween River drainage in western Thailand (Ref. 81214). 
Amblycipitidae Amblyceps variegatum Ng & Kottelat, 2000 Fr native   6.29 cm SL male/unsexed  Known from the Mae Khlong River drainage. Type locality, riffles between second ford and reservoir, upstream of Ban Huai Pak Khung, Nam Khung, Mae Nam Khwae Noi basin, Kanchanaburi Prov. (Ref. 37785).  No picture yet.
Danionidae Amblypharyngodon chulabhornae Vidthayanon & Kottelat, 1990 Fr native   4.00 cm SL male/unsexed  Known from the Chao Phraya, Maeklong, Mekong and Southeast Thailand river systems (Ref. 26336); also from Nong Khai and Phrae (Ref. 37773). Also Ref. 12693, 26580, 43281. 
Cyprinidae Amblyrhynchichthys micracanthus Ng & Kottelat, 2004 Fr native   19.67 cm SL male/unsexed  Known from Chao Phraya, Mekong and Mae Khlong river drainages (Ref. 55878). 
Cyprinidae Amblyrhynchichthys truncatus (Bleeker, 1850) Fr native  Pla taa luerk (Thai), Pla ngam lang (Thai), Pla nham lang (Thai), Pla ta kok (Thai), Pla ta luerk (Thai), Pla ta min (Thai), Pla taa min (Thai), Pla tha lon (Thai), Pla tha lun (Thai), Pla tha-lon (Thai), Pla tha-loon (Thai), ปลาตะโกก (Thai), ปลาตามิน (Thai), ปลาตาเหลือก (Thai), ปลาถลน (Thai), ปลาถลุน (Thai), ปลาหนามหลัง (Thai)  40.00 cm SL male/unsexed  Known from Peninsular Thailand, Maeklong, Chao Phraya and Mekong basins (Ref. 26336). Occurs in Maenam Chao Phaya; Pasak River; Tapi River, Bandon; Rachaburi (Ref. 1632); also from Bangkok, Nonthaburi, Nakhon Sawan, Nong Khai, Sakon Nakhon, Phra Nakhon Si Ayutthaya and Khon Kaen (Ref. 37773). Also Ref. 9648, 26580, 36654, 37773, 43281. 
Anabantidae Anabas testudineus (Bloch, 1792) Fr, Br, Fi, Aq native  Pla mor Thai (Thai), Pla mor (Thai), Pla sadet (Thai), ปลาหมอ (Thai), ปลาหมอไทย (Thai), ปลาเสด็จ (Thai)  25.00 cm TL male/unsexed  Found in Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Tale Sap (inner lake) (Phatthalung), Kwan Phayao (Phayao), Mae Kok (Chiang Rai), Chiang Mai, Phra Nakhon Si Ayutthaya, Ubon Ratchathani and Uthai Thani (Ref. 3773). Also Ref. 1632, 7306, 9648, 27732, 41236, 57235. 
Cyprinidae Anematichthys repasson (Bleeker, 1853) Fr native  Pla soi (Thai), Pla soi nok khao (Thai), Tapien sai (Thai), ปลาสร้อย (Thai), ปลาสร้อยนกเขา (Thai)  28.00 cm SL male/unsexed  Occurs in the Mekong River and its tributaries (Ref. 9648, 27732), Chao Phraya, Meklong, Pattani, Tale Sap (Ref. 2091) and Peninsular Thailand river system (Ref. 26336); also from Chiang Mai, Chiang San, Phrae, Phitsanulok, Chiang Rai, Surat Thani, Khon Kaen, Udon Thani, Kanchanaburi, Uthai Thani, Nong Khai, Yala and Prachin Buri (Ref. 37773). Also Ref. 26580, 36654. 
Anguillidae Anguilla australis Richardson, 1841 Fr, Br, M questionable   130 cm TL male/unsexed ;107 cm TL female  Reported to occur in the Bangkapi Canal, Bangkok and Phuket. Occurrence needs confirmation. 
Anguillidae Anguilla japonica Temminck & Schlegel, 1846 Fr, Fi, Ex not established  Pla lai yee pun (Thai), ปลาไหลญี่ปุ่น (Thai), Freshwater eel (English)  150 cm TL male/unsexed  Has established in aquaculture through continuous importation. Has not established in the wild (Ref. 1739). Main culture location is Bangkok (Ref. 6459). 
Anguillidae Anguilla malgumora Kaup, 1856 Fr native   80.00 cm TL male/unsexed  Reported from Southern peninsula (Ref. 37773). 
Anguillidae Anguilla marmorata Quoy & Gaimard, 1824 Fr native   70.00 cm TL male/unsexed ;200 cm TL female  Known from the Mekong River (Ref. 26336) as far upstream as Nakhon Phanom (Ref. 12693). 
Aplocheilidae Aplocheilus panchax (Hamilton, 1822) Fr, Br, Or native  Panchax (Thai), Pla hua ngen (Thai), Pla hua ngon (Thai), Pla hua ta kua (Thai), ปลาหัวงอน (Thai), ปลาหัวตะกั่ว (Thai), ปลาหัวเงิน (Thai)  9.00 cm TL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). Reported from Nonthaburi, Trat, Chanthaburi, Nakhon Si Thammarat, Ko Pha-ngan (Surat Thani), Songkhla, Phra Nakhon Si Ayutthaya, and Ranong (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 1632, 27139, 41236, 57235. 
Arapaimidae Arapaima gigas (Schinz, 1822) Fr introduced   450 cm TL male/unsexed   
Ariidae Arius acutirostris Day, 1877 Fr, Br native   40.00 cm NG male/unsexed  Found in Ranong (Ref. 94495). 
Ariidae Arius dispar Herre, 1926 Fr, Br native   34.00 cm SL male/unsexed  Reported from the Gulf of Thailand (Ref. 37773). 
Ariidae Arius macracanthus Günther, 1864 Fr native      No picture yet.
Ariidae Arius maculatus (Thunberg, 1792) Fr, Br, M, Fi native   80.00 cm TL male/unsexed  Known from the Gulf of Thailand, Songkhla, Chanthaburi and Bang Pakong river (Chachoengsao) (Ref. 37773); lower courses of rivers in Chao Phrya basin (Ref. 12693); and Bangkok (Ref. 37773). Also Ref. 3279. 
Ariidae Arius microcephalus Bleeker, 1855 Fr, Br, M native   60.00 cm TL male/unsexed  Reported from eastern Thailand (Ref. 38478). Known from the Tapi River near Bandon; also from Surat Thani, Samut Prakan and Songkhla (Ref. 37773). Also Ref. 6868, 58022. 
Ariidae Arius subrostratus Valenciennes, 1840 Fr, Br, M native   39.50 cm NG male/unsexed   
Gobiidae Aulopareia unicolor (Valenciennes, 1837) Fr, Br native   10.74 cm TL male/unsexed  Also Ref. 7050. 
Tetraodontidae Auriglobus modestus (Bleeker, 1850) Fr native   10.60 cm SL male/unsexed  Known from Nonthaburi, Bangkok, Klong Ko Nang Loeng, Suphan Buri river and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 2091. 
Tetraodontidae Auriglobus nefastus (Roberts, 1982) Fr native   13.00 cm SL male/unsexed  Known from the river systems of Peninsular Thailand and Mekong. Reported from Tale noi (Phatthalung) (Ref. 37773). Also Ref. 36654, 43281. 
Gobiidae Awaous melanocephalus (Bleeker, 1849) Fr, Br native   15.00 cm TL male/unsexed   
Badidae Badis badis (Hamilton, 1822) Fr questionable   7.10 cm TL male/unsexed  Known from the Mekong, Maeklong and Peninsular Thailand river systems (Ref. 26336). Outside distributional range, occurrence needs confirmation. 
Badidae Badis khwae Kullander & Britz, 2002 Fr native   2.91 cm SL male/unsexed  Known so far only from the localities in the Mae Nam Khwae Noi watershed, in the Mae Nam Mae Khlong basin, which drains to the Gulf of Thailand. Type locality, small stream near Ban Chong Lu, about 13 km northwest of Sangkhlaburi, Mae Nam Khwae Noi drainage, Kanchanaburi Prov. (Ref. 46238). 
Badidae Badis ruber Schreitmüller, 1923 Fr native   5.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281, 46238). 
Badidae Badis siamensis Klausewitz, 1957 Fr endemic   3.93 cm SL male/unsexed  Restricted to coastal drainages on the western side of the country (Ref. 46238). 
Sisoridae Bagarius bagarius (Hamilton, 1822) Fr, Fi, Or misidentification  Pla kae (Thai), Kae (Thai), Pla khae (Thai), Pla took kae (Thai), ปลาตุ๊กแก (Thai), ปลาแก้ (Thai), ปลาแค้ (Thai)  230 cm TL male/unsexed  Probably referring to Bagarius vegrandis or Bagarius lica. 
Sisoridae Bagarius lica Volz, 1903 Fr native   200 cm SL male/unsexed  Known from the Peninsular Thailand, Salween, Maeklong, Chao Phraya and Mekong basins (Ref. 26336). Migrates downstream from just above the Khone Falls to Chiang Saen in Thailand from October- December (Ref. 37770); also from Mae Hong Son (Ref. 37773). Also Ref. 2091, 27732, 35669. 
Sisoridae Bagarius suchus Roberts, 1983 Fr, Fi native   70.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 35669) and Chao Phraya basin (Ref. 43281). Museum: Mekong river mainstream at Bung Kla, ca 140 km. Northwest of Nakhon Phanom, CAS 95030 (Ref. 95030). Also Ref. 35669. 
Sisoridae Bagarius vegrandis Ng & Kottelat, 2021 Fr native   22.00 cm SL male/unsexed  Type locality of Bagarius vegrandis, Nakhon Phanom province, Mekong River at Ban Tha Kai, 21 km downstream of Mukdahan, 16 km E of Mukdahan by road (Ref. 123776).  No picture yet.
Bagridae Bagrichthys hypselopterus (Bleeker, 1852) Fr, Fi native   40.00 cm TL male/unsexed  Known from the upper part of Chao Phraya river, Nonthaburi, Nakhon Nayok river, Nong Khai and Ubon Ratchathani (Ref. 37773). Also Ref. 4537. 
Bagridae Bagrichthys macracanthus (Bleeker, 1854) Fr native  Pla kayeng bi kao (Thai), Pla kayeng wang (Thai), ปลาแขยงวัง (Thai), ปลาแขยงใบข้าว (Thai)  25.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 26336); also from Nonthaburi, Nakhon Nayok river, Nong Khai and Ubon Ratchathani (Ref. 37773). Also Ref. 9648, 36654, 43281. 
Bagridae Bagrichthys macropterus (Bleeker, 1854) Fr, Fi native   30.00 cm TL male/unsexed  Known from the Mekong and Chao Phraya basins (Ref. 26336); also from Phra Nakhon Si Ayutthaya, Ubon Ratchathani, Bang Pakong river (Chachoengsao) and Nakhon Nayok river (Ref. 37773). Also Ref. 12693, 36654. 
Bagridae Bagrichthys majusculus Ng, 2002 Fr native    Type locality, Mun R. at Ban Dan, 3 km upstream from Mekong R. confluence, Khong Chiam district, Ubon Ratchathani Prov. (Ref. 46206). 
Bagridae Bagrichthys obscurus Ng, 1999 Fr native   24.91 cm SL male/unsexed  Known from the Chao Phraya, Bang Pakong and Mekong drainages (Ref. 38653). Also Ref. 43281. 
Bagridae Bagroides melapterus Bleeker, 1851 Fr native   34.00 cm TL male/unsexed  Known from Chao Phraya river (Ref. 37773). Also Ref. 7050. 
Cyprinidae Balantiocheilos ambusticauda Ng & Kottelat, 2007 Fr native  Pla hang mai (Thai), Burnt tail fish (English)  10.51 cm SL male/unsexed  Type locality, Nakhon Sawan province, Bung Borapet, MHNG 2689.096 (holotype of Balantiocheilos ambusticauda, 10.51cm SL) (Ref. 58339). This species is considered endemic to the Mae Khlong and Chao Phraya basins. Its assessment in 2011 was also based on surveys done over the last 15 years throughout its confirmed range but no individual was recorded. The last specimen was found in 1974 that the species may already be extinct. Reasons for population decline were overfshing for international aquarium trade, habitat loss due to developnents of infrastructures anad possibly deterioration in water quality due to pollution caused by agro-chemicals. For these reasons the species is listed as Critically Endangered with a assumed population of less than 50 mature individuals. Further survey is still recommended and records from the Mekong basin should be further investigated (Ref. 117908).  No picture yet.
Cyprinidae Balantiocheilos melanopterus (Bleeker, 1850) Fr, Aq, Or native  Silver shark (English)  35.00 cm SL male/unsexed  Occurs in Maeklong, Chao Phraya and Mekong basins (Ref. 26336); also from Nonthaburi, Phra Nakhon Si Ayutthaya, Nakhon Sawan, Chai Nat, Uthai Thani and Kemarat (Ubon Ratchathani) (Ref. 37773). Controlled reproduction for the ornamental fish trade (Ref. 6459). Also Ref. 1632, 2091, 4537, 26580, 36654, 43281. 
Balitoridae Balitora annamitica Kottelat, 1988 Fr native   12.00 cm TL male/unsexed  Known from the Mekong River. 
Balitoridae Balitora brucei Gray, 1830 Fr native   10.50 cm SL male/unsexed  Reported from Mae Hong Son and Sa Kaew (Ref. 37773). 
Balitoridae Balitora burmanica Hora, 1932 Fr native   10.00 cm TL male/unsexed  Known from the Salween basin (Ref. 37826). Also Ref. 4832. In range Ref. 12041. 
Balitoridae Balitora meridionalis Kottelat, 1988 Fr native   8.15 cm SL male/unsexed  Occurs in high gradient streams in southeastern Thailand. Also Ref. 37826, 26580. 
Balitoridae Balitoropsis zollingeri (Bleeker, 1853) Fr native   10.00 cm TL male/unsexed  Known from Bangpakong (Ref. 7050). Occurs in the Chao Phraya basin (Ref. 43281); also from Phrae, Khon Kaen and Prachin Buri (Ref. 37773). Also Ref. 7050, 12041, 26580. 
Cyprinidae Bangana devdevi (Hora, 1936) Fr native   50.00 cm NG male/unsexed   
Cyprinidae Barbichthys laevis (Valenciennes, 1842) Fr native  Pla i gun pa pid (Thai), Pla hang buang (Thai), Pla hua liem (Thai), Pla kom hang wong (Thai), Pla sai tan (Thai), ปลากลมหางวง (Thai), ปลาหัวเหลี่ยม (Thai), ปลาหางบ่วง (Thai), ปลาอิกันปาปิด (Thai), ปลาไส้ตัน (Thai)  31.00 cm TL male/unsexed  Known from Chao Phraya, Mae Khlong and Mekong basins (Ref. 26336). Found in Kemarat (Ubon Ratchathani), Chiang Rai, Chai Nat, Nakhon Sawan, Nonthaburi and Yala (Ref. 37773). Also Ref. 1632, 2091, 9648, 12693, 26580, 36654, 43281. 
Cyprinidae Barbodes aurotaeniatus (Tirant, 1885) Fr native   9.00 cm TL male/unsexed  Known from the Mekong (Ref. 26336) and south-eastern region (Chao Phraya basin and small coastal drainages of the Gulf of Thailand (Ref. 12693); also from Chanthaburi and Kemarat (Ubon Ratchathani) (Ref. 37773). In range Ref. 12041, 27732, 36654, 43281. 
Cyprinidae Barbodes binotatus (Valenciennes, 1842) Fr, Or native   20.00 cm SL male/unsexed  Known from Salween, Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chiang Mai, Chiang Rai, Phrae, Kanchanaburi, Phitsanulok, Rayong, Surat Thani, Trang, Chanthaburi, Nakhon Si Thammarat, Uthai Thani, Chonburi, Nakhon Nayok, Chumphon, Nakhon Ratchasima, Prachin Buri and Narathiwat (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 1632, 2091, 26580, 36654. 
Cyprinidae Barbodes colemani (Fowler, 1937) Fr native    Reported from Mae Chaem (Chiang Mai) and Phra Nakhon Si Ayutthaya (Ref. 37773). Type locality, Me Poon [Mae Poon] R., Chiengmai (Ref. 50838). Also Ref. 33250.  No picture yet.
Cyprinidae Barbodes rhombeus (Kottelat, 2000) Fr native   6.50 cm SL male/unsexed  Known from the Mekong, Chao Phraya and Meklong basins and peninsular Thailand north of isthmus of Kra (Ref. 36949). Also Ref. 43281. 
Cyprinidae Barbonymus altus (Günther, 1868) Fr, Or native  Pla kra hea tong (Thai), Pla mong ka (Thai), Pla pak (Thai), Pla ta pien tong (Thai), ปลากระแหทอง (Thai), ปลาตะเพียนทอง (Thai), ปลาปาก (Thai), ปลาโมงค่า (Thai), Red tailed tinfoil (English)  25.00 cm TL male/unsexed  Occurs in the Mekong, Chao Phraya (Ref. 27732), Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336 ). Found in Bangkok, Paknam and Kemarat. Captured from the wild for the ornamental fish trade (Ref. 6459). Museum: Mekong mainstream near Chiang Sen, CAS 96265 (Ref. 5515); also from Phetchaburi, Nakhon Sawan, Chai Nat, Nakhon Phanom, Nong Khai and Surat Thani (Ref. 37773). Also Ref. 1632, 9648, 36654 
Cyprinidae Barbonymus balleroides (Valenciennes, 1842) Fr native   30.00 cm TL male/unsexed  Known from the Chao Phraya basin (Ref. 26580). 
Cyprinidae Barbonymus gonionotus (Bleeker, 1849) Fr, Fi, Aq native  Pla ta pien khao (Thai), Pla ta pien (Thai), Pla ta pien khaw (Thai), Pla ta pien sai (Thai), Pla tek kheng (Thai), ปลาตะเพียน (Thai), ปลาตะเพียนขาว (Thai), ปลาตะเพียนทราย (Thai), ปลาเต้กเคี้ยง (Thai), Puntius carp (English)  43.00 cm TL male/unsexed  Known from the Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336). Reported from Nakhon Nayok, Phetchaburi, Ratchaburi, Phra Nakhon Si Ayutthaya, Khon Kaen, Ubon Ratchathani, Bangkok, Kanchanaburi, Chanthaburi, Prachin Buri, Surat Thani and Phitsanulok (Ref. 37773). Also Ref. 1632, 6459, 7306, 9648, 26580, 27732. 
Cyprinidae Barbonymus schwanefeldii (Bleeker, 1854) Fr, Fi, Or native  Pla ta pien hang deng (Thai), Pla kra hea (Thai), Pla kra hea tong (Thai), Pla lam pam (Thai), Pla ta pien (Thai), Pla ta pien tong (Thai), ปลากระแห (Thai), ปลากระแหทอง (Thai), ปลาตะเพียน (Thai), ปลาตะเพียนทอง (Thai), ปลาตะเพียนหางแดง (Thai), ปลาลำปำ (Thai), Tinfoil (English)  35.00 cm SL male/unsexed  Found in Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Nonthaburi, Chiang Mai, Chanthaburi, Phattalung, Pattani, Phra Nakhon Si Ayutthaya, Surat Thani, Nakhon Sawan, Ratchaburi, Nakhon Ratchasima, Chiang Rai, Nakhon Nayok, Kanchanaburi and Phitsanulok (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 1739, 9648, 27732, 36654. 
Danionidae Barilius huahinensis Fowler, 1934 Fr native    Known from Nakhon Ratchasima, Kanchanaburi, Chiang Mai, Phrae and Nan. (Ref. 37773). Type locality: Ban Thung Luang, sw. Thailand (Ref. 33021). Museum: Mekong mainstream near Chiang Khan, CAS 96275 (Ref. 5515). In range Ref. 26580. Also Ref. 33021.  No picture yet.
Danionidae Barilius ponticulus (Smith, 1945) Fr native    Type locality: Chang-mai, presumably in the Meping R. (Ref. 33021). Also Ref. 2091.  No picture yet.
Bagridae Batasio fluviatilis (Day, 1888) Fr native   12.80 cm TL male/unsexed  Known from Ronpibun. Also recorded from Chumphon, Trang, Kanchanaburi and Nakhon Si Thammarat (Ref. 37773). Also Ref. 6868. 
Bagridae Batasio tengana (Hamilton, 1822) Fr native   9.00 cm TL male/unsexed  Reported from Surat Thani (Ref. 37773). Also Ref. 4833, 41236. 
Bagridae Batasio tigrinus Ng & Kottelat, 2001 Fr native   6.21 cm SL male/unsexed  Known from the Mae Nam Khwae Noi basin (part of Mae Khlong basin) in western Thailand. Type locality, 49 km on road from Thon Pha Phun to Sangkhla, 15°04'25"N, 98°33'51"E, Huai Lia, Mae Nam Khwae Noi basin, , Kanchanaburi Prov., Thailand. 
Gobiidae Bathygobius fuscus (Rüppell, 1830) Fr, Br, M native   12.00 cm TL male/unsexed  Reported from Rayong, Paknam (Samut Prakan), Chanthaburi, Lem Sing (Chanthaburi), Klong Wan (Prachuap Khiri Khan), Ko Racha Nork, Ko Racha Nai (Phuket), Ko Nu and Ko Maew (Songkhla) (Ref. 37773). 
Ariidae Batrachocephalus mino (Hamilton, 1822) Fr, Br, M, Fi native   25.00 cm TL male/unsexed  Known from Chanthaburi and Songkhla (Ref. 37773). 
Siluridae Belodontichthys dinema (Bleeker, 1851) Fr native   100.00 cm TL male/unsexed  Known from the Chao Phraya, Maeklong and Peninsular Thailand river systems (Ref. 26336). Also Ref. 7050, 36654, 37773. 
Siluridae Belodontichthys truncatus Kottelat & Ng, 1999 Fr native   60.00 cm SL male/unsexed  Known from the Chao Phraya and Mekong basins (Ref. 26336). 
Osphronemidae Belontia hasselti (Cuvier, 1831) Fr native   20.00 cm SL male/unsexed  Known from Thailand (Ref. 57235). 
Osphronemidae Betta apollon Schindler & Schmidt, 2006 Fr native   5.10 cm SL male/unsexed  Type locality, Province Narathiwat, about 20 km west of Narathiwat at street to Marubo, MTD F 30341 (holotype of Betta apollon, 5.1 cm SL, adult male). Known only from the hill streams west of Narathiwat in peninsular Thailand. Formerly, specimens from southern Thailand were classified as B. taeniata or identified as B. pugnax by Vierke in Geisler (1981). (Ref. 78499). 
Osphronemidae Betta ferox Schindler & Schmidt, 2006 Fr native   6.29 cm SL male/unsexed  Type locality, Hat Yai, about 30 km south-west of Rattsphun, Bori Pat, at the national street 406, 150 m before the junction into the Bori Pat waterfall park. MTD F 30355 (holotype of Betta ferox, 6.29 cm SL) . Known only from Bori Pat (Ref. 78499). 
Osphronemidae Betta imbellis Ladiges, 1975 Fr native   6.00 cm SL male/unsexed  Also Ref. 56613. 
Osphronemidae Betta kuehnei Schindler & Schmidt, 2008 Fr native   8.00 cm TL male/unsexed  Collected in Narathiwat; known from extreme south of peninsular Thailand in the vicinity of Sungkai Golok (Ref. 82661).  No picture yet.
Osphronemidae Betta mahachaiensis Kowasupat, Panijpan, Ruenwongsa & Sriwattanarothai, 2012 Fr, Br native   4.37 cm SL male/unsexed  Known from the Samut Sakhon Province and western Bangkok bordering Samut Sakhon Province (Ref. 92085). 
Osphronemidae Betta pallida Schindler & Schmidt, 2004 Fr native   3.35 cm SL male/unsexed ;3.28 cm SL female  Type locality, Narathiwat Province, Thailand; about 30 km west of Narathiwat at the street to Ruso. Known from the east coast of the country, from Surat Thani, Ko Samui in the north to Sungai Kolok in the south (Ref. 54318). 
Osphronemidae Betta pi Tan, 1998 Fr native   9.00 cm SL male/unsexed  Type locality, Province Narathiwat, Mae Nam Tod Deng, about 6 km north of Sungai Kolok, ZRC 40289 (holotype of Betta pi) (Ref. 78499). Known only from the peatswamps around Sungai Kolok in southern Thailand, at the border with Malaysia. Recorded from Toh Daeng Peat (Ref. 57235). Also Ref. 30225, 56613. 
Osphronemidae Betta prima Kottelat, 1994 Fr native   5.00 cm SL male/unsexed  Found in southeastern Thailand (Ref. 43281). 
Osphronemidae Betta pugnax (Cantor, 1849) Fr native   6.73 cm SL male/unsexed   
Osphronemidae Betta siamorientalis Kowasupat, Panijpan, Ruenwongsa & Jeenthong, 2012 Fr native   3.61 cm SL male/unsexed  Presently known from only Chachoengsao, Sa Kaeo, Prachin Buri, and Chon Buri provinces (only in areas close to Chachoengsao). In the Chon Buri province, this species is found only in Phanat Nikhom district (Ref. 93122).  No picture yet.
Osphronemidae Betta simplex Kottelat, 1994 Fr, Or, Thr native  Krabi mouth brooder betta (English)  8.00 cm TL male/unsexed  Known only from Krabi Province (Ref. 58784). Type locality: Spring (small lake) of Tham Sra Kaew and Nine Ponds, 2.2 km from National hwy 4034, nw. Krabi, Krabi Prov. Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 56613. Status of threat: Critically Endangered (Ref. 58784). 
Osphronemidae Betta smaragdina Ladiges, 1972 Fr native   7.00 cm TL male/unsexed  Known from the Mekong and Chao Phraya basins. Also Ref. 4537, 43281, 56613. 
Osphronemidae Betta splendens Regan, 1910 Fr, Or native  Siamese fighting fish (English)  6.50 cm TL male/unsexed  Known from Metang (Chiang Mai) (Ref. 37773). Highly bred for aquarium export trade (Ref. 12693). Also Ref. 4537, 6459, 12693, 56613. 
Osphronemidae Betta taeniata Regan, 1910 Fr questionable   5.49 cm SL male/unsexed  Reported from Klong Nakon Noi (Nakhon Si Thammarat) and Ban Ang (Chanthaburi) (Ref. 37773). Outside distributional range, occurrence needs confirmation. 
Sciaenidae Boesemania microlepis (Bleeker, 1858) Fr, Br, Fi native  Pla hang kew (Thai), Pla ma (Thai)  100.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong basins (Ref. 26336). Reported from Nan, Tachin, and Bang Pakong Rivers (Ref. 43946); Chai Nat, Chachoengsao, and Suphan Buri (Ref. 37773). Museum: Mekong river mainstream at Bung Kla, ca. 140 km nw of Nakhon Phanom, CAS 95034 (Ref. 5515). Also Ref. 9772. 
Oxudercidae Boleophthalmus boddarti (Pallas, 1770) Fr, Br, M native  Bulai (Thai), บู่ลาย (Thai)  22.00 cm TL male/unsexed  Known from Bangkok, Paknam (Samut Prakan), Bang Pakong river (Chachoengsao), Trat and Klong Wan (Prachuap Khiri Khan) (Ref. 37773). Also Ref. 52823. 
Danionidae Boraras maculatus (Duncker, 1904) Fr, Or native   2.50 cm SL male/unsexed  Reported from Narathiwat (Ref. 37773). Frequently seen in the aquarium trade (Ref. 57235). Also Ref. 4537. 
Danionidae Boraras micros Kottelat & Vidthayanon, 1993 Fr native   1.33 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281). Found in swamp 6 km north of Udon Thani where road no. 2 crosses railway, Mekong basin Udon Thani province (Ref. 33021); also from Nong Khai (Ref. 37773). Also Ref. 26336. 
Danionidae Boraras naevus Conway & Kottelat, 2011 Fr native   1.27 cm SL male/unsexed   
Danionidae Boraras urophthalmoides (Kottelat, 1991) Fr native   4.00 cm TL male/unsexed  Known from the Chao Phraya and Mae Khlong basins (Ref. 26580). Reported from Pattani, Narathiwat, and Nakhon Sawan (Ref. 37773). Also Ref. 7050, 57235. 
Butidae Bostrychus sinensis Lacepède, 1801 Fr, Br, M native   22.00 cm SL male/unsexed  Reported from Songkhla and Bang Pakong river (Chachoengsao) (Ref. 37773). 
Botiidae Botia rostrata Günther, 1868 Fr, Or, Thr native  Emperor loach (English)  25.00 cm NG male/unsexed  Inhabits mainstream of Salween river . Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Endangered (Ref. 58784).) 
Soleidae Brachirus aenea (Smith, 1931) Fr, Br, M native   21.00 cm TL male/unsexed  Reported from Chiang Mai, Kanchanaburi, Lop Buri river (Lop Buri), Nakhon Phanom, Nong Khai, Phra Nakhon Si Ayutthaya and Ubon Ratchathani (Ref. 37773).  No picture yet.
Soleidae Brachirus harmandi (Sauvage, 1878) Fr native   10.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 26336, 27732); also from Mae Klong river (Samut Songkhram) (Ref. 37773). Also Ref. 43281. 
Soleidae Brachirus pan (Hamilton, 1822) Fr, Br, M native   11.10 cm TL male/unsexed   
Soleidae Brachirus panoides (Bleeker, 1851) Fr, Br native   20.00 cm TL male/unsexed  Known from the Chao Phraya basin (Ref. 12041); also from Tapi river (Surat Thani), Klong Ko Nang Loeng (Bangkok), Ko Yai, Bang Thorani (Nonthaburi), Samut Prakan and Bandon (Ref. 37773). Also Ref. 12693. 
Soleidae Brachirus siamensis (Sauvage, 1878) Fr native   15.00 cm SL male/unsexed  Occurs in Chao Phraya and Mekong basins (Ref. 26336) and Peninsular Thailand (Ref. 43281).  No picture yet.
Gobiidae Brachyamblyopus brachysoma (Bleeker, 1854) Fr, Br native   10.50 cm TL male/unsexed  Also Ref. 7050, 092840.  No picture yet.
Gobiidae Brachygobius aggregatus Herre, 1940 Fr native   4.40 cm SL male/unsexed   
Gobiidae Brachygobius kabiliensis Inger, 1958 Fr native   1.80 cm SL male/unsexed   
Gobiidae Brachygobius mekongensis Larson & Vidthayanon, 2000 Fr native   1.75 cm SL male/unsexed  Known from the Mekong River (Ref. 38652). Also Ref. 43281. 
Gobiidae Brachygobius nunus (Hamilton, 1822) Fr native   2.50 cm SL male/unsexed  Also Ref. 37773. 
Gobiidae Brachygobius sabanus Inger, 1958 Fr native   2.70 cm SL male/unsexed  Recorded from a tidal ditch in Bangkok and from a freshwater pond, Gulf of Thailand (Ref. 43716).  No picture yet.
Gobiidae Brachygobius sua (Smith, 1931) Fr native   4.20 cm TL male/unsexed  Known from the Chao Phraya basin (Ref. 12041). Recorded from Khorat Plateau during Mekong fishery studies in 1975, but this record has to be confirmed (Ref. 12693); also from Bangkok and Klong Wan (Prachuap Khiri Khan) (Ref. 37773). 
Gobiidae Brachygobius xanthozona (Bleeker, 1849) Fr native  Bumblebeefish (English)  3.80 cm SL male/unsexed  Reported from Bangkok and Surat Thani (Ref. 37773). 
Dasyatidae Brevitrygon imbricata (Bloch & Schneider, 1801) Fr, Br, M native  Tuk ga (Thai), Kabang (Thai), กะบาง (Thai)  25.50 cm WD male/unsexed ;31.00 cm WD female  Collected from the sea at Had Chao Samran and Laem Pak Bia, Amphoe Ban Laem, Phetchaburi Province (Ref. 32547). Reported from the lower inner part of the Songkhla Lake (Thale Luang) (Ref. 32463); also from Chon Buri, Chanthaburi, Trat, Klong Wan (Prachuap Khiri Khan) and Si Racha Bay (Chon Buri) (Ref. 37773). Most common stingray in the Gulf of Thailand (Ref. 32457). Also Ref. 32444, 52823. 
Butidae Butis gymnopomus (Bleeker, 1853) Fr native   11.50 cm TL male/unsexed  Reported from Chanthaburi (Ref. 37773)  No picture yet.
Butidae Butis melanostigma (Bleeker, 1849) Fr, Br, M native   18.00 cm TL male/unsexed  Reported from Klong Dan (Samut Prakan) (Ref. 37773). 
Danionidae Cabdio morar (Hamilton, 1822) Fr native   20.00 cm NG male/unsexed  Known from Salween river (Tak) (Ref. 37773). Also Ref. 4832, 41236. 
Gobiidae Callogobius hasseltii (Bleeker, 1851) Fr, Br, M native   7.30 cm TL male/unsexed  Reported from Chanthaburi (Ref. 37773). 
Gobiidae Caragobius urolepis (Bleeker, 1852) Fr, Br native   8.50 cm SL male/unsexed  Known from Bang Pakong river (Chachoengsao) and Chao Phraya river (Ref. 37773). Also Ref. 7050. 
Cyprinidae Carassius auratus (Linnaeus, 1758) Fr, Aq introduced   48.00 cm TL male/unsexed  Also Ref. 1632, 58915. 
Cyprinidae Carassius carassius (Linnaeus, 1758) Fr, Fi not established   64.00 cm TL male/unsexed   
Carcharhinidae Carcharhinus leucas (Valenciennes, 1839) Fr, Br, M native  Chararm Hua-bart (Thai)  360 cm TL male/unsexed ;400 cm TL female  Occurs in the Gulf of Thailand (Ref. 244, 9997). 
Tetraodontidae Carinotetraodon lorteti (Tirant, 1885) Fr native   6.00 cm SL male/unsexed  Reported from NakhonChaisi river (Nakhon Pathom) (Ref. 37773). Also Ref. 13214. 
Cyprinidae Catlocarpio siamensis Boulenger, 1898 Fr, Fi, Thr native  Siamese giant carp (English), Pla kra ho (Thai), Kaho (Thai), Pla kaho (Thai), ปลากระโห้ (Thai) scarce (very unlikely) 300 cm TL male/unsexed  Occurs in the Mekong, Maeklong and Chao Phraya rivers (Ref. 26336, 26580). Population has declined drastically in Thailand, where it was formerly abundant (Ref. 10431). Naturally occurring population in the Chao Phraya has probably disappeared (Ref. 10431). Seems to encountered regularly from Nongkhai and further north up to Chiang, both on the Thai-and the Lao side of the Mekong; also recorded in Nakhon Phanom and Ubol Ratchathani (Ref. 37770). Juveniles measuring 2-6 cm were found from three places in Thailand: Chiang Saen in Chiang Rai Province, Tad Phanom in Nakhon Phanom Province and Khemaratch in Ubol Ratchathani Province. Juveniles of size 10-14 cm were also seen in November in Songkhram River, which indicates that this fish spawns in the Songkhram River basin (Ref. 37770); also from Chai Nat, Lop Buri, Ratchaburi, Nakhon Sawan, Nonthaburi and Phra Nakhon Si Ayutthaya (Ref. 37773). The flesh is fairly good to eat (Ref. 6459). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 1632, 9648, 12693, 36732, 43281. Status of threat: Endangered (Ref. 58784). 
Ariidae Cephalocassis borneensis (Bleeker, 1851) Fr, Br native   30.00 cm SL male/unsexed  Known from the Chao Phraya basin (Ref. 43281). Reported from Bangkok, Bang Pakong river (Chachoengsao), Nakhon Sawan, Chai Nat, and Nonthaburi (Ref. 37773). Also Ref. 36654. 
Ariidae Cephalocassis melanochir (Bleeker, 1852) Fr questionable   30.00 cm TL male/unsexed  Reported from Bangkok (Ref. 37773). Outside distributional range, occurrence needs further confirmation. 
Cyprinidae Ceratogarra cambodgiensis (Tirant, 1883) Fr, Or native  Siamese stone lapping fish (English)  24.00 cm TL male/unsexed  Found in the Maeklong, Mekong, Chao Phrya and Southeast Thailand river systems (Ref. 26336). Captured from the wild for the ornamental fish trade (under the name G. taeniata (Ref. 6459). Museum: Mekong river at Chiang Khan, CAS 63046 (Ref. 5515); Phrae, Phitsanulok, Kemarat (Ubon Ratchathani), Trang, Chanthaburi, Chiang Mai, Nakhon Si Thammarat, Kanchanaburi, Nakhon Sawan, Yala, Chiang Rai and Surat Thani (Ref. 37773). Also Ref. 12041, 27732, 26580, 36654, 43281. 
Cyprinidae Ceratogarra fasciacauda (Fowler, 1937) Fr native   11.00 cm SL male/unsexed  Known from the Maeklong, Chao Phraya and Mekong basins (Ref. 26336). Caught with large haul seines in the main stream of the Mekong (Ref. 12693). Museum: Mekong mainstream, CAS 96287 (between Pak Ing and Jom Paeng, about 4-5 km downstream); CAS 96286 (near Chiang Khan); CAS 96285 (ca. 4 km downriver from Pak Ing, ca. 25 km downriver from Chiang Khong) (Ref. 5515); Phrae, Phitsanulok, Kemarat (Ubon Ratchathani), Trang, Chanthaburi, Chiang Mai, Nakhon Si Thammarat, Kanchanaburi, Nakhon Sawan, Yala, Chiang Rai and Surat Thani (Ref. 37773). Also Ref. 1632, 27732, 43281. 
Siluridae Ceratoglanis pachynema Ng, 1999 Fr, Thr native  Club-barbel sheatfish (English), Pla ked (Thai), Pla ket (Thai), Pla sai yu (Thai), ปลาสายยู (Thai), ปลาเกด (Thai)  28.00 cm SL male/unsexed  Known from the Mekong drainage at Ubon Ratchathani and from the southeastern part of Chao Phraya drainage (Ref. 38651). Recorded from Bangpakong (Ref. 58784). Threatened due to habitat loss and overfishing (Ref. 587840. Also Ref. 9648, 37773, 43281. Status of threat: Critically Endangered (Ref. 58784). 
Chacidae Chaca bankanensis Bleeker, 1852 Fr native   20.00 cm TL male/unsexed  Known from Toh Daeng Peat, Thailand (Ref. 57235); also from Narathiwat (Ref. 37773). 
Cyprinidae Chagunius baileyi Rainboth, 1986 Fr native   30.00 cm NG male/unsexed  Known from Mekong Kha (Mae Hong Son) and Mae Sam Laep (Tak) (Ref. 37773). Also Ref. 4832. 
Cyprinidae Chagunius chagunio (Hamilton, 1822) Fr native   50.00 cm TL male/unsexed  Reported from Mae Hong Son and Kanchanaburi (Ref. 37773). 
Channidae Channa gachua (Hamilton, 1822) Fr native   32.90 cm TL male/unsexed  Known from the river systems of Peninsular and Southeast Thailand, Salween, Maeklong, Chao Phraya and Mekong (Ref. 26336); also from Doi Sutep, Chiangdao, Metang (Chiang Mai), Chanthaburi, Bua Yai (Nakhon Ratchasima), Huai Thap Salao (Uthai Thani), Ubon Ratchathani, Kanchanaburi, Chon Buri, Nakhon Nayok, Chiang Rai and Nakhon Si Thammarat (Ref. 37773). Also Ref. 27732. 
Channidae Channa lucius (Cuvier, 1831) Fr, Br, M native  Pla kra song (Thai), Pla ka song (Thai), ปลากระสง (Thai), ปลากะสง (Thai)  53.00 cm TL male/unsexed  Found in the river systems of Peninsular and Southeast Thailand, Maeklong, Chao Phraya and Mekong (Ref. 26336); also from Pak-Hai (Phra Nakhon Si Ayutthaya), Chanthaburi, Nakhon Sawan, Phuket, Pattani, Songkhla, Ubon Ratchathani, Nong Khai and Chanthaburi (Ref. 37773). Also Ref. 7773, 9648, 39648, 57235. 
Channidae Channa marulius (Hamilton, 1822) Fr, Fi native  Pla tjon gnoo aow (Thai), Great snakehead (English)  183 cm TL male/unsexed  Known from the Mekong basin (Ref. 26336); also from Kanchanaburi, Mae Hong Sorn and Uttaradit (Ref. 37773). Also Ref. 36654, 41236, 43638. 
Channidae Channa melasoma (Bleeker, 1851) Fr native   30.00 cm SL male/unsexed  Known from the Mekong basin. Recorded from Toh Daeng Peat, peninsular Malaysia and previously from Borneo (Ref. 57235); also from Mun river at Pakjong (Nakhon Ratchasima) (Ref. 37773). Also Ref. 2091, 12693, 36654. 
Channidae Channa micropeltes (Cuvier, 1831) Fr, Br, M, Fi, Aq, Or native  Pla ma lang poo (Thai), Pla ai pok (Thai), Pla cha do (Thai), ปลาชะโด (Thai), ปลาอ้ายป๊อก (Thai), ปลาแมงพู่ (Thai), Snakehead fish (English)  130 cm SL male/unsexed  Occurs in the Chao Phraya and Mekong basins (Refs. 27732, 9648), Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chiang Mai, Nonthaburi, Songkhla and Mekong river (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 7306, 37772, 43638, 57235. 
Channidae Channa orientalis Bloch & Schneider, 1801 Fr, Fi native   33.00 cm TL male/unsexed  Also Ref. 41236. 
Channidae Channa punctata (Bloch, 1793) Fr questionable   31.00 cm TL male/unsexed   
Channidae Channa striata (Bloch, 1793) Fr, Fi, Aq native  Pla chon (Thai), ปลาช่อน (Thai), Snakehead (English)  100.00 cm SL male/unsexed  Known from the river systems of Peninsular and Southeast Thailand, Salween, Maeklong, Chao Phraya and Mekong (Ref. 26336). Found throughout the length and breadth of the coastal plains and central plains, eastern plateau and piedment districts. Very popular fish as it is a daily food for both the rich and the poor. Preserved by sun drying (Ref. 6459); also from Metang (Chiang Mai), Chanthaburi, Ko Chang (Trat.), Mekong river, Songkhla and Huai Thap Salao (Uthai Thani) (Ref. 37773). Also Ref. 7306, 27732, 37772, 43640, 57235. 
Chaudhuriidae Chaudhuria caudata Annandale, 1918 Fr native   6.00 cm TL male/unsexed  Known from the river systems of Peninsular Thailand, Salween, Maeklong, Chao Phraya and Mekong (Ref. 26336). Occurred uncommonly in Thailand and southeast Asia (Ref. 57235); also from Pattani (Ref. 37773). Also Ref. 4833, 36654. 
Notopteridae Chitala blanci (d'Aubenton, 1965) Fr, Fi, Aq, Thr native  Mekong featherback (English)  120 cm SL male/unsexed  Found in the mainstream of the Mekong River (Ref. 7431). Spends the entire year in deep pools in the main river channel, but in few places like Klong Kaem in Ubol Ratchatani it enters tributaries during the flood season (Ref. 37770). Has been bred for several years in captivity at Sri Chiengmai Fisheries station (near Nongkhai) and elsewhere in Thailand (Ref. 7431). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 1632, 12255, 9648, 26336, 27732, 36654, 43281. In range Ref. 12041. Status of threat: Endangered (Ref. 58784). 
Notopteridae Chitala borneensis (Bleeker, 1851) Fr native   39.30 cm SL male/unsexed  Also Ref. 1632.  No picture yet.
Notopteridae Chitala chitala (Hamilton, 1822) Fr, Fi, Aq, Or misidentification  Pla tong krai (Thai), Knife fish (English), Pla hang pan (Thai), Pla krai (Thai), ปลากราย (Thai), ปลาตองกราย (Thai), ปลาหางแพน (Thai)  122 cm SL male/unsexed  Reported from the Mekong River and its tributaries (Ref. 9648); also from Phra Nakhon Si Ayutthaya, Nakhon Sawan, Ubon Ratchathani, Nong Khai, Khon Kaen, Bangkok, Chai Nat, Kanchanaburi, Phitsanulok and Surat Thani (Ref. 37773). Highly favoured food fish with a distinct flavour. Processed into fish balls and fish cakes. Captured from the wild for the ornamental fish trade (Ref. 6459). Outside the distributional range of the species and occurrence may be based on C. ornata (Ref. 7431). 
Notopteridae Chitala lopis (Bleeker, 1851) Fr, Fi, Thr extirpated  Giant featherback (English)  150 cm SL male/unsexed  Occurs in the Mekong (Ref. 43281), Meklong and the Chao Phraya basins (Ref. 10431). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 7050, 7431. Status of threat : Endangered (Ref. 58784). 
Notopteridae Chitala ornata (Gray, 1831) Fr native   100.00 cm SL male/unsexed  Known from Mekong, Chao Phraya and Meklong basins (Ref. 7431, 27732) and Southeast Thailand (Ref. 26336). Museum: Mekong river at Nakom Phanom, CAS 76170 (Ref. 5515). Also Ref. 26336, 27732, 37770. 
Tetraodontidae Chonerhinos naritus (Richardson, 1848) Fr native   28.50 cm TL male/unsexed  Reported from Phra Nakhon Si Ayutthaya and Bangkok (Ref. 37773). Also Ref. 4833. 
Cyprinidae Cirrhinus cirrhosus (Bloch, 1795) Fr, Fi, Aq not established   100.00 cm SL male/unsexed  Also Ref. 58915. 
Cyprinidae Cirrhinus jullieni Sauvage, 1878 Fr native   20.00 cm SL male/unsexed  Recorded from the Chao Phraya basin. Also known from Phra Nakhon Si Ayutthaya, Uthai Thani, Nakhon Sawan, Phitsanulok, Phrae, Chiang Mai, Chiang Rai, Nong Khai, Khon Kaen, Kanchanaburi, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 33488. 
Cyprinidae Cirrhinus microlepis Sauvage, 1878 Fr, Fi native  Small scale mud carp (English)  65.00 cm SL male/unsexed  Found in the Chao Phraya and Mekong basins (Ref. 26336, 33488); also from Bangkok, Chanthaburi, Nakhon Sawan and Phra Nakhon Si Ayutthaya (Ref. 37773). From Xayabouri in Laos to Chiang Saen in Thailand, it undertakes upstream migrations from March to August. From Klong Kaem District, Ubolratchatani, fish migrates upstream in February; at Khemmaratch further upstream in Ubolratchatani, it moves upstream in March-April; at Mukdahan, it goes upstream in May. However, it migrates downstream at Klong Kaem in June-July (Ref. 37770). Fish caught in dams are known to reach up to 15 kg in (Jean-Francois, pers. comm. 11/02). Also Ref. 12041, 26336, 27732, 37772, 43281. 
Cyprinidae Cirrhinus molitorella (Valenciennes, 1844) Fr native   55.00 cm TL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732), Maeklong (Ref. 26336) and the Tapi basin in Peninsular Thailand (Ref. 33488). Reported from Khon Kaen, Nongkhai, Kemarat (Ubon Ratchathani), Phitsanulok, Phrae, and Surat Thai (Ref. 37773). Also Ref. 12041, 26580, 43281. Reported as introduced (Ref. 74657, 26336, 26580). 
Clariidae Clarias batrachus (Linnaeus, 1758) Fr, Fi, Ex, Or misidentification  Pla duk dan (Thai), Pla duk (Thai), Pla duk dam (Thai), Pla duk nam jued (Thai), Pla duk nam juend (Thai), ปลาดุก (Thai), ปลาดุกด้าน (Thai), ปลาดุกน้ำจืด (Thai), Albino walking fish (English)  47.00 cm TL male/unsexed  Occurs in the Chao Phraya, Mekong, Maeklong, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). Recorded from Chiengmai (Chiang Mai), Me Poon, Pitsanulok, Bangkok, and Tale Sap (Ref. 1632); also from Kanchanaburi and Surat Thani (Ref. 37773). Highly priced food fish. Consumed fresh (Ref. 6459). Also Ref. 9648, 27732, 37773, 39637, 57235. 
Clariidae Clarias cataractus (Fowler, 1939) Fr native    Known from Trang, Nakhon Si Thammarat and Surat Thani (Ref. 37773).  No picture yet.
Clariidae Clarias gariepinus (Burchell, 1822) Fr introduced   170 cm TL male/unsexed  Introduced from Laos in 1987 for aquaculture reasons (Ref. 58848). It has an invasive impact (Ref. 58848). Also Ref. 58915. 
Clariidae Clarias leiacanthus Bleeker, 1851 Fr native   33.00 cm TL male/unsexed   
Clariidae Clarias macrocephalus Günther, 1864 Fr, Fi native  Pla duk uey (Thai), Duk uey (Thai), Pla douk uey (Thai), Pla oui chae (Thai), ปลาดุกอุย (Thai), ปลาอั้วะชื้อ (Thai) common (usually seen) 120 cm TL male/unsexed  Found in the Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Nakhon Sawan, Khon Kaen, Songkhla and Phitsanulok (Ref. 37773). Generally occurs in rivers, canals and swamps. Consumed as food (Ref. 6459). In Thailand, this fish is considered to be better and more nourishing than Clarias batrachus and thought wrongly as female of Clarias batrachus (Ref 2686). Also Ref. 1632, 9648, 37772, 57235. 
Clariidae Clarias meladerma Bleeker, 1846 Fr native   35.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Peninsular and Southeast Thailand river systems (Ref. 26336). Recorded from Mekong basin on the basis of material from Nong Khai Province (Ref. 37786); also from Nakhon Sawan, Phichit, Khao Lue Nai (Chachoengsao), Sa Keaw, Narathiwat and Surat Thani (Ref. 37773). Also Ref. 7050, 57235. 
Clariidae Clarias nieuhofii Valenciennes, 1840 Fr, Br, M, Fi native   50.00 cm TL male/unsexed  Reported from Krat river (Trat), Chumphon, Patthalung and Songkhla (Ref. 37773). Restricted to peats and lowland forest streams. Important foodfish in Southern Thailand (Ref. 57235). Also Ref. 36654. 
Clariidae Clarias teijsmanni Bleeker, 1857 Fr native   22.00 cm TL male/unsexed  Reported from Nakhon Si Thammarat (Ref. 37773). 
Ehiravidae Clupeichthys aesarnensis Wongratana, 1983 Fr, Fi native   7.00 cm SL male/unsexed  Occurs in the Mekong basin. Museum: Mekong river, CAS 96711, 63016 (near Chiang Khan) (Ref. 5515); also from Khon Kaen and Phitsanulok (Ref. 37773). Commercial catches occur in northeastern part of Thai reservoir, also in the east and middle parts of the Pasak Jolasid reservoir (Ref. 85859). Also Ref. 188, 26336, 27732, 43281. 
Ehiravidae Clupeichthys goniognathus Bleeker, 1855 Fr, Fi native  Pla sew kaew (Thai), Kajok (Thai), Pla siew keaw (Thai), ปลาซิวแก้ว (Thai)  12.00 cm TL male/unsexed  Known from the Mekong River and its tributaries (Ref. 9648); also from Kalasin, Khon Kaen, Kanchanaburi, Chanthaburi, Phitsanulok and Surat Thani (Ref. 37773). Also Ref. 188, 7050, 36654. 
Ehiravidae Clupeichthys perakensis (Herre, 1936) Fr native   4.00 cm SL male/unsexed  Known from Malay Peninsula to Perak river (Ref. 57235). 
Ehiravidae Clupeoides borneensis Bleeker, 1851 Fr, Fi native   8.00 cm SL male/unsexed  Known from the Chao Phaya and Mekong basins (Ref. 27732). Occurs in Tachin (Samut Sakhon) and Bangkok (Ref. 1632). Also Ref. 188, 27732, 43281. 
Ehiravidae Clupeoides venulosus Weber & de Beaufort, 1912 Fr native   9.00 cm SL male/unsexed  Reported from Puang Klong Nong Moh (Phra Nakhon Si Ayutthaya) (Ref. 37773). 
Ailiidae Clupisoma sinense (Huang, 1981) Fr native   31.00 cm SL male/unsexed  Known from the Mekong and Maeklong basins (Ref. 26336, 43281). 
Cobitidae Cobitis laoensis (Sauvage, 1878) Fr native   10.60 cm SL male/unsexed  Found in the Mekong basin.  No picture yet.
Ariidae Cochlefelis burmanicus (Day, 1870) Fr, Br native   40.00 cm NG male/unsexed   
Engraulidae Coilia lindmani Bleeker, 1857 Fr, Br, Fi native   20.00 cm SL male/unsexed  Known from the Bangpakong River (Ref. 1632) and Gulf of Thailand (Ref. 36654); also from Chao Phraya river (Bangkok) (Ref. 37773). Also Ref. 189. 
Serrasalmidae Colossoma macropomum (Cuvier, 1816) Fr introduced   108 cm TL male/unsexed   
Cichlidae Coptodon rendalli (Boulenger, 1897) Fr, Br, Fi introduced   45.00 cm TL male/unsexed  Also Ref. 58915. 
Cichlidae Coptodon zillii (Gervais, 1848) Fr introduced   40.00 cm SL male/unsexed   
Ehiravidae Corica laciniata Fowler, 1935 Fr, Br, Fi native   7.00 cm SL male/unsexed  Known from Paknam (Samut Prakan), Tachin (Samut Sakhon) and Bangkok (Ref. 1632). Also Ref. 188, 7050. 
Ehiravidae Corica soborna Hamilton, 1822 Fr native   5.30 cm TL male/unsexed  Reported from Huey Khrai (Prachin Buri) and Khon Kaen (Ref. 37773). 
Cyprinidae Cosmochilus harmandi Sauvage, 1878 Fr native   100.00 cm TL male/unsexed  Known from the Chao Phraya and Mekong basins (Ref. 26336, 43281). Museum: Mekong river mainstream at bung Kla, ca. 140 km nw of Nakhon Phanom, CAS 96128 (Ref. 5515); also from Phra Nakhon Si Ayutthaya and Nong Khai (Ref. 37773). Also Ref. 26580, 36654. 
Mugilidae Crenimugil heterocheilos (Bleeker, 1855) Fr native   50.00 cm SL male/unsexed  Reported from Ko Tao (Surat Thani) (Ref. 37773). 
Cyprinidae Crossocheilus atrilimes Kottelat, 2000 Fr native   16.40 cm TL male/unsexed  Occurs in the Mekong and Chao Phraya basins. Also Ref. 43281. 
Cyprinidae Crossocheilus cobitis (Bleeker, 1854) Fr native   14.80 cm TL male/unsexed  Known from Mekong and Chao Phraya basins (Ref. 43281). Found in Phayao, Nakhon Sawan, Chiang Rai, and Ubon Ratchathani (Ref. 37773). Also Ref. 7050, 43281. 
Cyprinidae Crossocheilus oblongus Kuhl & Van Hasselt, 1823 Fr native   16.00 cm SL male/unsexed  Known from the Chao Phraya, Mekong and Peninsular Thailand river systems (Ref. 26336). Reported from Phayao, Pattani, Khon Kaen, Salween river and its tributaries, Chiang Mai, and Phitsanulok (Ref. 37773). Museum: Mekong river at Chiang Khan, CAS 63035 (Ref. 5515). Also Ref. 1632, 12693, 26580, 27732, 43281. 
Cyprinidae Crossocheilus reticulatus (Fowler, 1934) Fr native   17.00 cm SL male/unsexed  Found in the Chao Phrya basin (Ref. 12693, 12041), Mae Khlong basin (Ref. 12041) and Mekong basin (Ref. 27732). Museum: Mekong, CAS 63037 (Chiang Khan); CAS 96129, 96115 (mainstream near Chiang Saen); CAS 96119 (ca. 4 km downriver from Pak Ing, ca. 25 km downriver from Chiang Khong); CAS 96118 (between Pak Ing and Jom Paeng, about 4-5 km downstream) (Ref. 5515); also from Si Sawat (Kanchanaburi), Trang, Nong Khai, Surat Thani, Nakhon Nayok, Phra Nakhon Si Ayutthaya, Sakhon Nakhon, Phayao, Kalasin, Khon Kaen, Chiang Mai, Phrae, Phitsanulok and Prachinburi (Ref. 37773). Also Ref. 1632, 26580, 36654, 43281. 
Cyprinidae Crossocheilus tchangi Fowler, 1935 Fr native   12.90 cm SL male/unsexed  Known from Chao Phraya, Mae Khlong, Bangpakong, Tapi, and Trang basins (Ref. 116015).  No picture yet.
Ariidae Cryptarius truncatus (Valenciennes, 1840) Fr, Br, M native   42.00 cm SL male/unsexed  Known from the lower course of the Chao Phraya (Ref. 12693), Bangkok and Songkhla (Ref. 37773). Also Ref. 7050. 
Balitoridae Cryptotora thamicola (Kottelat, 1988) Fr endemic   2.84 cm SL male/unsexed  Appears to be restricted to two caves, Tham Susa and Tham Mae Lana (Ref. 42927). Tham Susa in Mae Hong Son Province is an outflow stream cave rising to the east of Nam Khong, a tribuary of Nam Mae Pai, itself a tributary of the Salween River (Ref. 37846). Syntopic with Schistura oedipus in Tham Mae Lana (Ref. 42927). Type locality: Susa Cave, Mae Hong Son Prov., Thailand, 19°28'N, 98°08'E (Ref. 37846). Also Ref. 27299, 26580, 37773. 
Gobiidae Ctenogobius vexillifer Fowler, 1937 Fr native    Found only in the lower Chao Phraya basin in Bangkok (Ref. 92298).  No picture yet.
Xenocyprididae Ctenopharyngodon idella (Valenciennes, 1844) Fr, Fi introduced  Pla chao heu (Thai), Pla chao hea (Thai), Pla kin ya (Thai), Pla van hea (Thai), Pla van heu (Thai), ปลากินหญ้า (Thai), ปลาหวันฮื้อ (Thai), ปลาเฉาฮื้อ (Thai), Gardd carp (English), Grass carp (English)  150 cm TL male/unsexed  Also Ref. 1632. Popular food fish among the Chinese. Usually eaten raw (Ref. 6459). Also Ref. 58915. 
Cyprinidae Cyclocheilichthys apogon (Valenciennes, 1842) Fr, Fi native  Pla ya (Thai), Pla ngam lung (Thai), Pla nham lung (Thai), Pla sai tan (Thai), Pla ta deng (Thai), Pla ta pien sai (Thai), Pla taa dang (Thai), ปลาตะเพียนทราย (Thai), ปลาตาแดง (Thai), ปลาหญ้า (Thai), ปลาหนามหลัง (Thai), ปลาไส้ตัน (Thai) abundant (always seen in some numbers) 28.70 cm TL male/unsexed  Occurs in the Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Bangkok, Petchaburi, Kanchanaburi, Kalasin, Khon Kaen, Surat Thani, Chanthaburi, Nakhon Si Thammarat, Ubon Ratchathani, Prachuap Khiri Khan, Phitsanulok, Phrae, Narathiwat and Surat Thani (Ref. 37773). Widely distributed and an important element in the food supply of the people living along the large rivers (Ref. 4832). Also Ref. 9648, 26580, 36654, 43281, 57235. 
Cyprinidae Cyclocheilichthys armatus (Valenciennes, 1842) Fr native  Pla pak leim (Thai), Pla pak luem (Thai), Tapien sai (Thai), ปลาปากเหลี่ยม (Thai)  23.00 cm SL male/unsexed  Known from Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336). Museum: Mekong river at Chiang Khan, CAS 63032 (Ref. 5515); also from Phitsanulok, Phrae, Nakhon Sawan, Kemarat (Ubon Ratchathani), Phra Nakhon Si Ayutthaya, Khon Kaen, Kanchanaburi, Phayao, Uttaradit, Nong Khai and Surat Thani (Ref. 37773). Also Ref. 9648, 2091, 26580, 27732, 33021, 36654. 
Cyprinidae Cyclocheilichthys enoplos (Bleeker, 1849) Fr, Fi, Ex native  Pla ta kok (Thai), Pla ka ti (Thai), Pla kra tai (Thai), Pla nham lung (Thai), Pla takoke (Thai), Pla tiok (Thai), Takok tapien (Thai), ปลากระต่าย (Thai), ปลากะทิ (Thai), ปลาตะโกก (Thai), ปลาหนามหลัง (Thai)  74.00 cm SL male/unsexed  Occurs in Peninsular Thailand, Chao Phraya, Maeklong and Mekong river systems (Ref. 26336). Reported from Bangkok, Khon Kaen, Nonthaburi, Nakhon Sawan, Nakhon Phanom, Nong Khai and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 1632, 7050, 26580. 
Cyprinidae Cyclocheilichthys furcatus Sontirat, 1989 Fr native   60.00 cm SL male/unsexed  Known from the Mekong River. Also found in Khong Chiam (Ubon Ratchathani) and Mukda Han (Ref. 37773). Also Ref. 12693, 43281. 
Cyprinidae Cyclocheilichthys heteronema (Bleeker, 1854) Fr native   12.00 cm SL male/unsexed  Known from the Chao Phraya, Mekong and Southeast Thailand river systems (Ref. 26336); also from Phatthalung, Surat Thani and Phra Nakhon Si Ayutthaya (Ref. 37773). Once common in central Thailand but now endangered. Recently known from Mun river and Southern Thailand including flood plain and Toh Daeng Peat (Ref. 57235). Also Ref. 10417, 26580, 43281. 
Cyprinidae Cyclocheilichthys lagleri Sontirat, 1989 Fr native   15.00 cm SL male/unsexed  Known from the Chao Phraya basin (Ref. 12041); also from Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 12693, 26580. 
Cynoglossidae Cynoglossus microlepis (Bleeker, 1851) Fr native   32.50 cm SL male/unsexed  Occurs in the Chao Phraya basin (Ref. 43281); also from Nonthaburi, Pak-kret, Ko Yai, Nakhon Sawan and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 5297, 12693, 36654. 
Cyprinidae Cyprinus carpio Linnaeus, 1758 Fr, Fi, Aq introduced  Pla nai (Thai), Pla lee heu (Thai), Pla lee ko (Thai), ปลาหลีฮื้อ (Thai), ปลาหลีโก (Thai), ปลาไน (Thai), Common carp (English)  120 cm TL male/unsexed  Occurs in the Mekong basin at the Low Pamong (Ref. 37772). Also Ref. 1632, 12228, 58848, 58915. 
Danionidae Danio albolineatus (Blyth, 1860) Fr, Fi, Or native   9.58 cm TL male/unsexed  Known from Salween, Maeklong, Peninsular and Southeast Thailand, Chao Phraya and Mekong river systems (Ref. 26336). Occurs in Koh Samui and Phliu waterfall stream, Chantaburi (Chanthaburi) (Ref. 1632); also from Ko Samui (Surat Thani) (Ref. 37773). A popular aquarium fish (Ref. 57235). Also Ref. 26580, 36654, 37788, 43281. 
Danionidae Danio kerri Smith, 1931 Fr native   5.00 cm TL male/unsexed  Occurs in Koh Yao Yai (Ref. 1632); also from Surat Thani and Chanthaburi (Ref. 37773). Also Ref. 4537. 
Danionidae Danio roseus Fang & Kottelat, 2000 Fr native  Purple passion danio (English)  3.65 cm SL male/unsexed  Known from the Mekong basin in Nong Khai and Chiang Rai Provinces. Also Ref. 43281. 
Lobotidae Datnioides microlepis Bleeker, 1854 Fr, Fi, Pr, Or native  Pla soua taw (Thai), Pla seua taw (Thai), Seua (Thai), Seua tor (Thai) scarce (very unlikely) 55.00 cm TL male/unsexed  Occurs in the central section, in the Chao Phrya, the Sak, the Nan, and Bung Borapet. Most numerous in the Mekong River at Ubol Ratchathani and Nakhon Phanom provinces. Also found in the Maeklong basin (Ref. 26336). Its flesh has good flavour & quality & fetches a high price (Ref. 6459). Protected (Ref. 12217). Museum: Mekong river at Chiang Khan, CAS 63018 (Ref.5515); also from Central Thailand, Phra Nakhon Si Ayutthaya, Nakhon Sawan and Ubon Ratchathani (Ref. 37773). Heavily exploited for the aquarium trade in Chao Phraya from about 1960 through the 1970's (Ref. 10425). Has become very rare, perhaps due to environmental deterioration of the Chao Phraya as well as intensive fishing (Ref. 10425). 
Lobotidae Datnioides polota (Hamilton, 1822) Fr, Fi, Or native  Pla kapong lai (Thai), Four barred tiger fish (English)  30.00 cm SL male/unsexed  Known from the lower parts of Chao Phraya, Bangpakong and Tapi rivers; Krabi; Tale Sap (Ref. 10425); also from Nonthaburi, Tale Sap Songkhla, Pak Payoon (Phatthalung) and Thai waters (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). 
Lobotidae Datnioides pulcher (Kottelat, 1998) Fr, Thr extirpated  Siamese tiger perch (English)  40.00 cm SL male/unsexed  Occurs in the Chao Phraya and Mekong basins (Ref. 58784). Wiped out or disappeared due to habitat loss and overfishing (Ref. 58784). Also Ref. 27732, 43281. Status of threat: Extinct (Ref. 58784). 
Lobotidae Datnioides undecimradiatus (Roberts & Kottelat, 1994) Fr, Thr native  Mekong tiger perch (English)  40.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 26336, 27732). Threatened due to habitat loss and overfishing (Ref. 58784). Museum: Ubol Ratchatani market, USNM 325065. Also Ref. 10425, 43281. Status of threat: Endangered (Ref. 58784). 
Zenarchopteridae Dermogenys pusilla Kuhl & van Hasselt, 1823 Fr, Br, Aq, Or questionable  Halfbeak (English)  16.10 cm TL male/unsexed  Reported from Chanthaburi, Bangkok, and Songkhla (Ref. 37773); reared in captivity for the ornamental fish trade (Ref. 6459, 57235). Recorded from Chao Phraya River and Mekong River (Ref. 26336). Also Ref. 1632, 36654. Outside distributional range, occurrence needs further confirmation. 
Zenarchopteridae Dermogenys siamensis Fowler, 1934 Fr native   4.00 cm SL male/unsexed ;6.00 cm SL female  Occurs in the Mekong and Chao Phraya basins (Ref. 43281). Also from the Maeklong basin (Ref. 26336). 
Cyprinidae Desmopuntius hexazona (Weber & de Beaufort, 1912) Fr native   5.50 cm TL male/unsexed  Known from Toh Daeng Peat (Ref. 57235). 
Cyprinidae Desmopuntius johorensis (Duncker, 1904) Fr native   12.00 cm TL male/unsexed  Known from Narathiwat Province (Ref. 37849). 
Danionidae Devario aequipinnatus (McClelland, 1839) Fr native   15.00 cm TL male/unsexed  Occurs in Nakon Sritamarat (Nakhon Si Thammarat); also from Kanchanaburi and Mae Hong Son (Ref. 37773). Also Ref. 41236, 43638, 43640. 
Danionidae Devario annandalei (Chaudhuri, 1908) Fr native   9.00 cm SL male/unsexed  Known from Chao Phraya and Mekong basins. Also Ref. 26580. 
Danionidae Devario laoensis (Pellegrin & Fang, 1940) Fr native   8.00 cm TL male/unsexed  Known from several localities in the upper Mekong drainage (Ref. 37788). Collected at Nam Mae Mao at Ban Huai Phak Phai in the Mekong basin of Chiang Mai Province (Ref. 39226); also from Mae Hong Son and Chiang Rai (Ref. 37773). Also Ref. 37787, 37788, 43281. 
Danionidae Devario maetaengensis (Fang, 1997) Fr endemic   5.00 cm SL male/unsexed  Type locality of Danio maetaengensis, Chiang Mai Province: Nam Mae Taeng River, tributary of Mae Nam Ping, about 56 km north of Chiang Mai; holotype: ANSP 174721 (Ref. 94476). Seems to be restricted to mountain streams of upper Mae Nam Ping of Chao Phraya drainage (Ref. 13393). 
Danionidae Devario peninsulae (Smith, 1945) Fr native   8.00 cm SL male/unsexed  Type locality, base of Kao Luang, Naka Sritamarat [Nakorn-Sritamarat], Peninsular Thailand, elev. 300 m. (Ref. 46206). Also Ref. 37773. 
Danionidae Devario regina (Fowler, 1934) Fr, Br, M native   10.80 cm TL male/unsexed  Reported from Ko Samui (Surat Thani), Nakhon Si Thammarat, Trang, Phuket, Kanchanaburi, Mae Hong Son and Surat Thani (Ref. 37773). Also Ref. 4832, 41236. 
Danionidae Devario shanensis (Hora, 1928) Fr questionable   7.00 cm TL male/unsexed  Reported from Chiang Mai and Surat Thani (Ref. 37773). In range Ref. 12041. 
Danionidae Devario suvatti (Fowler, 1939) Fr native   9.00 cm SL male/unsexed  Reported from Trang and Chanthaburi (Ref. 37773). Type locality, Chong Mountain, waterfall at Trang (Ref. 46206, 50126).  No picture yet.
Leiognathidae Deveximentum ruconius (Hamilton, 1822) Fr, Br, M native   8.00 cm TL male/unsexed  Found in mangrove forest at Phang-nga Bay. Also known from Tha Chin river (Samut Sakhon), Paknam (Samut Prakan), Krabi, Lem Sing (Chanthaburi), Klong Wan (Prachuap Khiri Khan), Thai waters and Andaman sea (Ref. 37773). 
Tetraodontidae Dichotomyctere nigroviridis (Marion de Procé, 1822) Fr, Br native  Pakpaokhiaochut (Thai), ปักเป้าเขียวจุด (Thai)  17.00 cm TL male/unsexed   
Cyprinidae Discherodontus ashmeadi (Fowler, 1937) Fr native   13.60 cm SL male/unsexed 5.5 TL Known from the Mekong (Ref. 26336, 27732) and Maeklong (Ref. 26580); also from Kemarat (Ubon Ratchathani) (Ref. 37773). Also Ref. 43281. 
Cyprinidae Discherodontus halei (Duncker, 1904) Fr native   10.50 cm TL male/unsexed  Occurs in Mekong (Ref. 33021) and Chao Phraya (Ref. 26580); also from Kanchanaburi and Phichit (Ref. 37773). Also Ref. 3881, 26580. 
Cyprinidae Discherodontus schroederi (Smith, 1945) Fr native    Known from the Chao Phraya basin. Also found in Mae Klang (Chiang Mai), Tak and Uthai Thani (Ref. 37773). Also Ref. 26580. 
Syngnathidae Doryichthys boaja (Bleeker, 1850) Fr, Or native  Pipe fish (English)  41.00 cm SL male/unsexed  Captured from the wild for the ornamental fish trade (Ref. 6459). Found in the lower Mekong or nearby parts of Thailand (Ref. 12693) and Chao Phraya basin (Ref. 43281); also from Nakhon Sawan, Chai Nat, Nakhon Nayok and Chanthaburi (Ref. 37773). Also Ref. 5316. 
Syngnathidae Doryichthys contiguus Kottelat, 2000 Fr native   10.98 cm SL male/unsexed  Known from the Mekong basin. Material has been collected in Bung Kan (Ref. 36949). Also Ref. 43281. 
Syngnathidae Doryichthys deokhatoides (Bleeker, 1854) Fr native   18.50 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732); also from Tale Sap at Lampam (Phatthalung) (Ref. 37773). Also Ref. 5316. 
Syngnathidae Doryichthys martensii (Peters, 1868) Fr native   15.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chanthaburi, Nakhon Sawan and Songkhla (Ref. 37773). Also Ref. 5316. 
Cyprinidae Eirmotus octozona Schultz, 1959 Fr native   3.56 cm SL male/unsexed  Known from Bung Boraphet (Nakhon Sawan) (Ref. 37773). Has not been collected anymore in Thailand despite numerous sampling efforts (Ref. 78741). Occurrence needs further confirmation in Chao Phraya (Ref. 26580). Also Ref. 7050, 78741. 
Ellopostomatidae Ellopostoma mystax Tan & Lim, 2002 Fr, Thr endemic  Enigmatic loach (English)  7.00 cm TL male/unsexed  Known only from Peninsular Thailand, Tapi and Pattani basins (Ref. 58784). Threatened due to habitat loss (Ref. 58784). Type locality, Khlong Sok on highway 410, 5 km west of Phanom, Tapi basin, Surat Thani Province (Ref. 50838). Status of threat: Critically Endangered (Ref. 58784). 
Clariidae Encheloclarias kelioides Ng & Lim, 1993 Fr native  scarce (very unlikely) 6.48 cm SL male/unsexed  Reported from Tonh Daeng Peat (Ref. 57235).  No picture yet.
Engraulidae Encrasicholina devisi (Whitley, 1940) Fr, Br, M, Fi native   9.70 cm TL male/unsexed ;10.00 cm TL female  Reported from Phangnga, Prachuap Khiri Khan and Chumphon (Ref. 37773). Also Ref. 189. 
Cyprinidae Epalzeorhynchos bicolor (Smith, 1931) Fr, Aq, Or, Thr endemic  Redtail shark (English), Pla hang daeng (Thai), Pla cha lam hang daeng (Thai), Pla song kruang (Thai), Pla song krueng (Thai), ปลาทรงเครื่อง (Thai), ปลาหางแดง (Thai) scarce (very unlikely) 13.00 cm TL male/unsexed  Known from Maeklong to Bang Pakong basins (Ref. 58784). Recorded from Chao Phraya basin (Ref. 28024); Phra Nakhon Si Ayutthaya, Nakhon Sawan, Chai Nat and Kanchanaburi (Ref. 37773). Occurrence in the Mekong River and its tributaries (Ref. 9648, 37773) needs confirmation (Ref. 28024). Controlled reproduction for the ornamental fish trade (Ref. 6459). It is not clear whether the species still exists in the wild (Ref. 12217). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 26580. Status of threat: Critically Endangered (Ref. 58784). 
Cyprinidae Epalzeorhynchos frenatum (Fowler, 1934) Fr, Or native  Red finned shark (English)  15.00 cm TL male/unsexed  Occurs in the Maeklong (Ref. 26336), Mekong and Chao Phraya basins (Ref. 26336, 27732). Known from Chiang Mai and the Tachin ( Samut Sakhon) River (Ref. 1632); also from Phra Nakhon Si Ayutthaya, Nakhon Sawan, Ubon Ratchathani, Kanchanaburi, Nakhon Ratchasima, Phrae and Phitsanulok (Ref. 37773). Controlled reproduction for the ornamental fish trade (Ref. 6459). Also Ref. 26580, 36654, 43281. 
Cyprinidae Epalzeorhynchos kalopterum (Bleeker, 1850) Fr native   16.00 cm TL male/unsexed  Known from Surat Thani and Yala (Ref. 37773). Also Ref. 1632, 4537, 28024. 
Cyprinidae Epalzeorhynchos munense (Smith, 1934) Fr native   9.30 cm SL male/unsexed  Occurs in the Mekong (Ref. 27732), Maeklong (Ref. 26336) and Chao Phraya (Ref. 43281). 
Epinephelidae Epinephelus bruneus Bloch, 1793 Fr, Br, M, Lf native   136 cm TL male/unsexed  Reported from Phuket, Ranong, Prachuap Khiri Khan, Chumphon and Surat Thani (Ref. 37773). 
Epinephelidae Epinephelus malabaricus (Bloch & Schneider, 1801) Fr, Br, M, Fi, Lf native  Pla karang-dum (Thai)  234 cm TL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan), Gulf of Thailand, Andaman sea, Songkhla and Samut Prakan (Ref. 37773). Museum: CAS 61519 (Ref. 5515). Also Ref. 1602. 
Epinephelidae Epinephelus morrhua (Valenciennes, 1833) Fr, Br, M native   90.00 cm TL male/unsexed  Reported from the Gulf of Thailand, Prachuap Khiri Khan, Chumphon and Phuket (Ref. 37773). 
Epinephelidae Epinephelus quoyanus (Valenciennes, 1830) Fr, Fi, Lf native  Pla karang-dok-namtal (Thai)  40.00 cm TL male/unsexed  Reported from Ranong, Chumphon, Chanthaburi, Trat and Krabi (Ref. 37773). Museum: BMNH 1920.7.13.18. Bangkok, ANSP 62323-27. Gulf of Thailand, Chol Buri Province, Ko Kram Noi Is., CAS 62163. Ko Samet Is., CAS 61624. Prachuap Khiri Khan, UMMZ 191432. Phuket, BPBM 22897. Also Ref. 4787, 5222. 
Epinephelidae Epinephelus sexfasciatus (Valenciennes, 1828) Fr, Br, M, Fi native   40.00 cm TL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan), Samut Prakan, Chumphon, Songkhla and Si Racha (Chon Buri) (Ref. 37773). Museum: Phuket, ZUMC P43614-18. Gulf of Thailand, RUSI 27670. Prachuap Khiri Khan, CAS 62164; UMMZ 191130. Ko Chang, ZUMC CN4; ANSP 89390; CAS 61559. Also Ref. 4787, 5222. 
Leiognathidae Equulites popei (Whitley, 1932) Fr, Br, M, Fi native   12.00 cm TL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan), Andaman sea and Si Racha (Chon Buri) (Ref. 37773). Also Ref. 3424. 
Danionidae Esomus danrica (Hamilton, 1822) Fr, Fi questionable   13.00 cm TL male/unsexed  Also Ref. 2073. 
Danionidae Esomus longimanus (Lunel, 1881) Fr native   8.00 cm SL male/unsexed  Found in the Mekong (Ref. 12693, 26336) and Chao Phraya (Ref. 12041, 26580); also from Phitsanulok and Kemarat (Ubon Ratchathani) (Ref. 37773). Also Ref. 12693, 26580, 36654, 43281. 
Danionidae Esomus metallicus Ahl, 1923 Fr native  Pla siew nuad yao (Thai), ปลาซิวหนวดยาว (Thai)  7.50 cm SL male/unsexed  Occurs in Mekong River and its tributaries (Ref. 9648), the Chao Phraya and Salween basins, and northern Malay Peninsula (Ref. 27732). Reported from Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336). Also Ref. 12693, 26580, 36654, 37773, 43281, 57235. 
Gobiidae Eugnathogobius kabilia (Herre, 1940) Fr native  Pla bu (Thai)  3.60 cm TL male/unsexed  Reported from Bangkok (Ref. 12041). Also Ref. 12693, 43716. 
Gobiidae Eugnathogobius microps Smith, 1931 Fr, Br native   2.65 cm SL male/unsexed  Type locality, lower Bangpakong River, central Thailand, USNM 90316 (holotype of Eugnathogobius microps, 2.6 cm SL) (Ref. 80545). Small mangrove creek, Klong Bang Sai, Phuket Island, NTM S.13953-013 (7, 1.8-2.55 cm SL) (Ref. 43716). 
Gobiidae Eugnathogobius siamensis (Fowler, 1934) Fr native   4.00 cm TL male/unsexed  Known from the Chao Phrya basin (Ref. 12693). Museum: Silom Canal, Bangkok, ANSP 60025 (holotype of Vaimosa siamensis, 3.15 cm SL) (Ref. 43716). Also Ref. 1632. 
Schilbeidae Eutropiichthys salweenensis Ferraris & Vari, 2007 Fr native   13.20 cm SL male/unsexed  Found only in one location along Salween River (Ref. 75095).  No picture yet.
Schilbeidae Eutropiichthys vacha (Hamilton, 1822) Fr, Fi native   38.20 cm TL male/unsexed  Known from Moei river (Tak) (Ref. 37773). Also Ref. 41236. 
Sisoridae Exostoma berdmorei Blyth, 1860 Fr native   10.00 cm TL male/unsexed    No picture yet.
Sisoridae Exostoma effrenum Ng & Vidthayanon, 2014 Fr native   6.50 cm SL male/unsexed  Type locality, upper reaches of the Ping River (one of two main tributaries of the Chao Phraya River) drainage in northwestern Thailand, NIFI 4955 (holotype of Exostoma effrenum, 5.13 cm SL), Found in the upper reaches of the Ping River (one of two main tributaries of the Chao Phraya River) drainage in northwestern Thailand (Ref. 97386).  No picture yet.
Sisoridae Exostoma labiatum (McClelland, 1842) Fr, Thr native  Burmese bat catfish (English)  11.00 cm TL male/unsexed  Known from the Salween basin (Ref. 58784). Threatened due to habitat loss (Ref. 58784). Status of threat: Endangered (Ref. 58784). 
Sisoridae Exostoma peregrinator Ng & Vidthayanon, 2014 Fr native   7.02 cm SL male/unsexed  Type locality of Exostoma peregrinator (Ref. 97386).  No picture yet.
Gobiidae Favonigobius reichei (Bleeker, 1854) Fr, Br, M native   8.30 cm TL male/unsexed  Known from Ko Chang (Trat) and Songkhla (Ref. 37773). Also Ref. 7050, 52823. 
Dasyatidae Fluvitrygon kittipongi (Vidthayanon & Roberts, 2005) Fr native   26.80 cm WD male/unsexed ;28.50 cm WD female  Type locality, Menam Maekhlong near Kanchanaburi, Kittipongs Jarutanin, ZRC 50381 (holotype of Himantura kittipongi, 26.4 cm disc width, female) (Ref. 59378). 
Dasyatidae Fluvitrygon oxyrhynchus (Sauvage, 1878) Fr native   36.00 cm WD male/unsexed  Known from Menam Nan river (Ref. 40953). 
Dasyatidae Fluvitrygon signifer (Compagno & Roberts, 1982) Fr, Br, Fi, Or native  Krabane khao (Thai)  60.00 cm WD male/unsexed  Found in estuaries and rivers of the Gulf of Thailand (Ref. 12693), Mekong River at Nong Khai (Ref. 37773) and Tapi River (Ref. 38725). Common in the Chao Phraya River (from Nontaburi to Nakhon Sawan Provinces), the Nan River (at Phichit Province), the Yom River (at Phitsanulok Province), and the Tachin River (Ref. 32457). Found year-round (Ref. 32457). Caught with hook-and-lines and sold fresh in local markets (Ref. 32457). Utilized by the aquarium trade (Ref. 32457). Museum: Chao Phrya, Nakornsawan Province, KUMF 2862 (Ref. 2091). Also Ref. 32444. 
Cyprinidae Folifer brevifilis (Peters, 1881) Fr native   40.50 cm TL male/unsexed  Known from Salween and Mekong basins. Also Ref. 37773. 
Sisoridae Gagata cenia (Hamilton, 1822) Fr, Fi questionable   15.00 cm SL male/unsexed  Known from Ta Ta Fang (Mae Hong Son) (Ref. 37773). Species reported to occur in the country in Ref. 1632 but not in Ref. 40780, thus report might be referring to G. gasawyuh (Ref. 40780:325). Occurrence needs further confirmation. 
Poeciliidae Gambusia affinis (Baird & Girard, 1853) Fr, Br introduced   5.10 cm TL male/unsexed ;7.00 cm TL female  Also Ref. 58848, 58915. 
Cyprinidae Garra fisheri (Fowler, 1937) Fr native   5.00 cm TL male/unsexed  Known from the Maeklong, Chao Phraya, Mekong and Peninsular Thailand river systems (Ref. 26336); also from Yom river (Phrae) and Tha Chin river (Samut Sakhon) (Ref. 37773). Also Ref. 12693. 
Cyprinidae Garra fuliginosa Fowler, 1934 Fr native   18.00 cm SL male/unsexed  Found in the Chao Phraya, Mekong, Maeklong and Peninsular Thailand river systems (Ref. 26336); also from Uthai Thani, Kanchanaburi, Phrae, Chiang Mai, Phitsanulok and Surat Thani (Ref. 37773). Also Ref. 12693, 43281. 
Cyprinidae Garra nasuta (McClelland, 1838) Fr native   20.00 cm NG male/unsexed  Known from Chao Phraya basin (Ref. 26580). Also Ref. 36949. 
Cyprinidae Garra salweenica Hora & Mukerji, 1934 Fr native   17.44 cm SL male/unsexed  Known from Nam Mae Surin and Mae Nam Moei (Ref. 36949). 
Cyprinidae Garra waensis Lothongkham, Arbsuwan & Musikasinthorn, 2014 Fr native   9.09 cm SL male/unsexed  Known so far from the Wa River (locally called as 'Nam Wa'), a tributary of the Upper Nan River in Bo Kluea District, Nan Province, northern Thailand (Re. 95678).  No picture yet.
Leiognathidae Gazza minuta (Bloch, 1795) Fr, Br, M native   21.00 cm FL male/unsexed  Reported from Si Racha (Chon Buri), Paknam (Samut Prakan), Rayong and Lem Sing (Chanthaburi) (Ref. 37773). Museum: Chonburi Fish Market, BIMS 0123. Tanna I., Banuatu, BMNH 1979.6.13 (syntypes of G. tapeinosoma). Gulf of Thailand, CBM-ZF 9011, 9014 - 9016. Yanaw Fish Market, CBM-ZF 9012 (Ref. 27956). 
Eleotridae Giuris margaritaceus (Valenciennes, 1837) Fr, Br, M native   29.00 cm TL male/unsexed   
Glaucostegidae Glaucostegus thouin (Anonymous [Lacepède], 1798) Fr, Br, M, Fi, Thr native  Clubnose guitarfish (English), Ee-mud (Thai)  300 cm TL male/unsexed  Known from Samud Prakan; Maenam Wen; Lem Sing,Chantaburi; the Gulf of Thailand; and Tale Sap (Ref. 1632); also from Wain river (Chon Buri), Rayong, Trat and Songkhla (Ref. 37773). Threatened due to overfishing (Ref. 58784). Also Ref. 9909. Status of threat: Endangered (Ref. 58784). 
Gobiidae Glossogobius aureus Akihito & Meguro, 1975 Fr native   25.00 cm SL male/unsexed  Found in the Chao Phraya basin (Ref. 43281). Also Ref. 5259. 
Gobiidae Glossogobius circumspectus (Macleay, 1883) Fr, Br native   35.00 cm TL male/unsexed  Also Ref. 52823. 
Gobiidae Glossogobius giuris (Hamilton, 1822) Fr, Br, M native  Buhin (Thai), บู่หิน (Thai)  50.00 cm SL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan) (Ref. 37773). Also Ref. 41236, 52823. 
Sisoridae Glyptothorax buchanani Smith, 1945 Fr native    Found in the Chao Phraya basin (Ref. 12041); also from Nong Khai and Chiang Mai (Ref. 37773). 
Sisoridae Glyptothorax callopterus Smith, 1945 Fr native    Known from Trang, Mae Hong Son and Phrae (Ref. 37773). 
Sisoridae Glyptothorax fuscus Fowler, 1934 Fr native   12.10 cm SL male/unsexed  Known from the Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chanthaburi, Nakhon Si Thammarat, Phrae, Mae Hong Son, Chiang Mai and Yala (Ref. 37773). Also Ref. 12693, 43281. 
Sisoridae Glyptothorax lampris Fowler, 1934 Fr native   12.10 cm SL male/unsexed  Known from the Chao Phraya basin, Mekong basin and southeastern Thailand (Ref. 43281); also from Chiang Mai (Ref. 37773). Also Ref. 1693, 12041, 27732. 
Sisoridae Glyptothorax laosensis Fowler, 1934 Fr native   10.80 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 26336, 27732). Also Ref. 12041. 
Sisoridae Glyptothorax macromaculatus Li, 1984 Fr native   16.08 cm SL male/unsexed  Reported from Lop Sao (Chiang Rai) (Ref. 37773). 
Sisoridae Glyptothorax major (Boulenger, 1894) Fr native   14.40 cm TL male/unsexed  Reported from Chanthaburi, Chiang Rai, Phitsanulok and Phrae (Ref. 37773). 
Sisoridae Glyptothorax platypogonides (Bleeker, 1855) Fr native   12.30 cm TL male/unsexed  Known from Phrae, Mae Hong Son, Nakhon Si Thammarat and Surat Thani (Ref. 37773). Also Ref. 36654. 
Sisoridae Glyptothorax prashadi Mukerji, 1932 Fr native   6.60 cm SL male/unsexed  Known from Nakhon Si Thammarat (Ref. 37773). Also Ref. 4833.  No picture yet.
Sisoridae Glyptothorax rugimentum Ng & Kottelat, 2008 Fr native   7.86 cm SL male/unsexed  Known from Salween River drainage (Ref. 74930). 
Sisoridae Glyptothorax siamensis Hora, 1923 Fr native   13.90 cm TL male/unsexed  Known from Nakhon Si Thammarat (Ref. 56938). 
Sisoridae Glyptothorax trilineatus Blyth, 1860 Fr, Fi native  Pla tid hin (Thai), Kae (Thai), Kot kae (Thai), ปลาติดหิน (Thai)  30.00 cm TL male/unsexed  Found in the Mekong, Chao Phraya, Salween, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chiang Mai, Trang, Nakhon Si Thammarat, Chanthaburi and Chiang Mai (Ref. 37773). Also Ref. 1632, 4833, 9648, 41236. 
Gobiidae Gobiopsis macrostoma Steindachner, 1861 Fr, Br, M native   10.00 cm SL male/unsexed  Reported from Paknam (Samut Prakan) and Chanthaburi (Ref. 37773). 
Gobiidae Gobiopsis quinquecincta (Smith, 1931) Fr native   2.40 cm SL male/unsexed  Reported from Ko Phi Phi Don (Krabi) (Ref. 37773). 
Gobiidae Gobiopterus brachypterus (Bleeker, 1855) Fr native   2.90 cm TL male/unsexed   
Gobiidae Gobiopterus chuno (Hamilton, 1822) Fr native   3.00 cm SL male/unsexed  Known from the Mekong and Chao Phraya basins (Ref. 26336); also from Bangkok (Ref. 37773). Also Ref. 7050, 11344. 
Characidae Gymnocorymbus ternetzi (Boulenger, 1895) Fr introduced   7.50 cm SL male/unsexed   
Cyprinidae Gymnostomus ariza (Hamilton, 1807) Fr, Fi native   30.00 cm SL male/unsexed  Occurrence needs further confirmation in Chao Phraya (Ref. 26580). 
Gyrinocheilidae Gyrinocheilus aymonieri (Tirant, 1883) Fr, Or native  Pla phueng (Thai), Pla e-dood (Thai), Pla luk phing (Thai), Pla luk phueng (Thai), Pla mood (Thai), Pla pak tai (Thai), Pla pak ti (Thai), Pla phing (Thai), Pla rak kluay (Thai), Pla ya lu (Thai), ปลาปากใต้ (Thai), ปลาผึ้ง (Thai), ปลามูด (Thai), ปลายาลู (Thai), ปลารากกล้วย (Thai), ปลาลูกผึ้ง (Thai), ปลาอีดูด (Thai), Algae eater (English)  28.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Meklong, Trang and Tapi basins (Ref. 13074). Also found in the river systems of Peninsular and Southeast Thailand (Ref. 26336); also from Chiang Mai, Nonthaburi, Nakhon Sawan, Nakhon Ratchasima, Udon Thani, Samut Prakan, Surat Thani, Lampang, Ratchaburi, Kanchanaburi, Chanthaburi, Phrae and Phitsanulok (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 9648, 26580, 27732, 36654. 
Gyrinocheilidae Gyrinocheilus pennocki (Fowler, 1937) Fr native   28.00 cm SL male/unsexed  Found in the Mekong basin (Ref. 13074, 26336); also from Kemarat (Ubon Ratchathani) (Ref. 37773). 
Cyprinidae Hampala dispar Smith, 1934 Fr native  Pla kra soop jud (Thai), Kasoop soop (Thai), Pla sood (Thai), ปลากระสูบจุด (Thai), ปลาสูด (Thai)  35.00 cm SL male/unsexed  Occurs in the Mekong River and its tributaries (Ref. 9648). Reported from the Chao Phraya basin (Ref. 26336) but this needs confirmation as this species is apparently endemic to the Mekong basin (Ref. 12693). Museum: Mekong mainstream near Chiang Khan, CAS 95580 (Ref. 5515); also from Sakon Nakhon, Ubon Ratchathani, Khon Kaen and Nong Khai (Ref. 37773). Also Ref. 27732, 36654, 43281. 
Cyprinidae Hampala lopezi Herre, 1924 Fr native   8.50 cm SL male/unsexed    No picture yet.
Cyprinidae Hampala macrolepidota Kuhl & Van Hasselt, 1823 Fr, Fi native  Pla i gun tu bu (Thai), Kasoop (Thai), Kasoop khap (Thai), Pla ka soop bung (Thai), Pla ka soop kead (Thai), Pla ka soop kiead (Thai), Pla sood (Thai), Pla soop (Thai), ปลากะสูบขีด (Thai), ปลากะสูบบั้ง (Thai), ปลาสูด (Thai), ปลาสูบ (Thai), ปลาอิกันตูบู (Thai)  70.00 cm SL male/unsexed  Found in Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Bangkok, Nonthaburi, Kanchanaburi, Phra Nakhon Si Ayutthaya, Chiang Mai, Chiang San (Chiang Rai), Phrae, Chanthaburi, Phitsanulok and Surat Thani (Ref. 37773). Also Refs. 1632, 2059, 9648, 26580, 27732, 36654, 43281, 45536, 57235. 
Cyprinidae Hampala salweenensis Doi & Taki, 1994 Fr native   30.00 cm NG male/unsexed  Specimens are collected from the Mae Pai River system, Mae Hong Son. Museum: (Mae Surin River, Ban Huei Phan, Mae Hong Son) NSMT-P 35838; (Mae Surin River, Ban Huei Phan, Mae Hong Son) NSMT-P 35839; (Mae Pai River, near Mae Hong Son Fisheries Station, Mae Hong Son) KUMF 2959. Also Ref. 37773. 
Sisoridae Hara filamentosa Blyth, 1860 Fr native   5.00 cm SL male/unsexed  Known from the Tak Province in Mae Nam Moei, a tributary of the Salween river on Thai-Burmese border (Ref. 37773). 
Sisoridae Hara mesembrina Ng & Kottelat, 2007 Fr native    Type locality, Hillstreams flowing from Langkatuek, Klong Naka, Baan Na District, Ranong Province, Thailand (Ref. 81932).  No picture yet.
Pangasiidae Helicophagus leptorhynchus Ng & Kottelat, 2000 Fr native   47.20 cm SL male/unsexed  Known from the Mekong and Chao Phraya basins (Ref. 43281). 
Pangasiidae Helicophagus waandersii Bleeker, 1858 Fr native  Pla sang ka ward na noo (Thai), Pla sa wai noo (Thai), Pla sa wai nu (Thai), Pla sang ka wart na nu (Thai), ปลาสวายหนู (Thai), ปลาสังกะวาดหน้าหนู (Thai)  70.00 cm TL male/unsexed  Found in the Mekong and Chao Phraya basins (Ref. 26336); also from Phra Nakhon Si Ayutthaya, Chai Nat, Nakhon Sawan, Ubon Ratchathani, Samut Prakan, Nong Khai and Lop Buri (Ref. 37773). Also Ref. 1632, 7432, 9648, 36654. 
Helostomatidae Helostoma temminckii Cuvier, 1829 Fr, Fi, Aq, Or native  Pla mor tan (Thai), Pla bai tan (Thai), Pla e - go (Thai), Pla e - tan (Thai), Pla mhor tan (Thai), Pla vee (Thai), ปลาวี (Thai), ปลาหมอตาล (Thai), ปลาอีตาล (Thai), ปลาอีโก (Thai), ปลาใบตาล (Thai)  30.00 cm TL male/unsexed  Occurs in riveres and swamps of central to peninsular Thailand (Ref. 57235). Reported from Tale Noi (Phatthalung), Bung Boraphet (Nakhon Sawan), Songkhla and Surat Thani (Ref. 37773). Consumed as food because of its excellent taste and quality. Also exported as aquarium fish (Ref. 6459). Also Ref. 1739, 7050, 9987. 
Ariidae Hemiarius stormii (Bleeker, 1858) Fr, Br native   50.00 cm TL male/unsexed  Known from the Chao Phraya basin (Ref. 43281). Also Ref. 7050, 37773. 
Ariidae Hemiarius verrucosus (Ng, 2003) Fr, Thr native  Shovelnose sea catfish (English)  80.00 cm TL male/unsexed  Reported from the Chao Phraya River (Ref. 58784). Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Endangered (Ref. 58784).  No picture yet.
Bagridae Hemibagrus baramensis (Regan, 1906) Fr native   24.00 cm SL male/unsexed  Reported from Songkhla (Ref. 37773). 
Bagridae Hemibagrus filamentus (Fang & Chaux, 1949) Fr, Br native   50.00 cm TL male/unsexed  Known from the Mekong basin (Ref. 38441). Reported from the river systems of Peninsular and Southeast Thailand, Maeklong and Chao Phraya (Ref. 26336). Also Ref. 43281. 
Bagridae Hemibagrus imbrifer Ng & Ferraris, 2000 Fr native   18.66 cm SL male/unsexed  Known only from the Salween river drainage.  No picture yet.
Bagridae Hemibagrus microphthalmus (Day, 1877) Fr native   150 cm NG male/unsexed  Known from the Salween River (Ref. 41209). Reported from Mae Hong Son (Ref. 37773). 
Bagridae Hemibagrus nemurus (Valenciennes, 1840) Fr, Br, Fi, Or native  Pla kot cha long (Thai), Pla i gun ba hung (Thai), Pla kayeng (Thai), Pla khang (Thai), Pla khueng (Thai), Pla kot (Thai), Pla kot ka rung (Thai), Pla kot khao (Thai), Pla kot khaw (Thai), Pla kot luang (Thai), Pla kot lueng (Thai), Pla kot mhor (Thai), Pla kot mor (Thai), Pla kot na (Thai), Pla kot nam jued (Thai), Pla kot nam juend (Thai), ปลากด (Thai), ปลากดกะรัง (Thai), ปลากดขาว (Thai), ปลากดชะโลง (Thai), ปลากดนา (Thai), ปลากดน้ำจืด (Thai), ปลากดหม้อ (Thai), ปลากดหลวง (Thai), ปลากดเหลือง (Thai), ปลากึง (Thai), ปลาอิกันบาฮุง (Thai), ปลาแขยง (Thai) common (usually seen) 65.00 cm SL male/unsexed  Found in the Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336). Recorded from Chienmai (Chiang Mai), Pitsanulok, Nontaburi , Bangkok, Tachin (Samut Sakhon), MepPoon and Tale Sap (Ref. 1632); also from Phrae, Uthai Thani, Songkhla, Khon Kaen, Kanchanaburi, Ubon Ratchathani, Chai Nat, Surat Thani, Nakhon Sawan, Phra Nakhon Si Ayutthaya, Chanthaburi, Prachin Buri and Narathiwat (Ref. 37773). Museum: Mekong mainstream, CAS 96573 (between Pak Ing and Jom Paeng, about 4-5 km downstream); CAS 96966 (Huay Nam Ngam near That Phanom) (Ref. 5515). Also Ref. 9648, 27732, 36654, 57235. 
Bagridae Hemibagrus planiceps (Valenciennes, 1840) Fr native   33.50 cm TL male/unsexed  Occurs in mangrove forests at Ban Don and Phang-nga Bays. Also known from Phrae, Phitsanulok, Rayong, Songkhla, Kanchanaburi and Chanthaburi (Ref. 37773). Also Ref. 36654. 
Bagridae Hemibagrus pluriradiatus (Vaillant, 1892) Fr native   21.60 cm SL male/unsexed  Occurs in the Mekong River. 
Bagridae Hemibagrus wyckii (Bleeker, 1858) Fr, Or native  Pla kot dum (Thai), Kot dong (Thai), Pla kot kaew (Thai), Pla kot keow (Thai), Pla kot khang mhor (Thai), Pla kot kheow (Thai), ปลากดข้างหม้อ (Thai), ปลากดดำ (Thai), ปลากดเขี้ยว (Thai), ปลากดแก้ว (Thai)  90.00 cm TL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong and Peninsular Thailand river systems (Ref. 26336). Also found in the Lopburi River and Bangkok (Ref. 1632); also from Phrae, Phitsanulok, Khon Kaen, Nakhon Ratchasima, Phra Nakhon Si Ayutthaya, Chiang Mai, Mae Hong Son, Nong Khai, Chai Nat, Kanchanaburi and Surat Thani (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 9648, 36654, 43281. 
Bagridae Hemibagrus wyckioides (Fang & Chaux, 1949) Fr native   130 cm TL male/unsexed  Occurs in the Mekong, Chao Phraya, Maeklong and Peninsular Thailand river systems (Ref. 26336); also from Phrae and Surat Thani (Ref. 37773). Also Ref. 27732. 
Gobiidae Hemigobius hoevenii (Bleeker, 1851) Fr, Br, M native   6.00 cm TL male/unsexed  Museum: mangrove swamp at Phuket, URM P.12662 (Ref. 43716). Also Ref. 44011. 
Balitoridae Hemimyzon formosanus (Boulenger, 1894) Fr questionable   10.00 cm SL male/unsexed  Reported from Thaungyin river, a tributary of Salwin river (Tak.) (Ref. 37773). Outside distributional range, occurrence needs further verification. 
Balitoridae Hemimyzon nanensis Doi & Kottelat, 1998 Fr native   5.66 cm SL male/unsexed  Type locality, Nam Wa River, Ban Nam Wa, Mae Nam Nan basin, Nan Province, NSMT-P 36130 (holotype, 3.96 cm SL) (Ref. 30340). Recorded in Yom basin (Ref. 94697). 
Zenarchopteridae Hemirhamphodon pogonognathus (Bleeker, 1853) Fr native   10.00 cm SL male/unsexed ;6.00 cm TL female  Known from Malay peninsula to Borneo (Ref. 57235). Also Ref. 26761. 
Siluridae Hemisilurus heterorhynchus (Bleeker, 1854) Fr native   80.00 cm TL male/unsexed  Reported from Ubon Ratchathani (Ref. 37773). 
Siluridae Hemisilurus mekongensis Bornbusch & Lundberg, 1989 Fr native   80.00 cm TL male/unsexed  Known from the Mekong River (Ref. 26336). Also Ref. 37773, 43281. 
Dasyatidae Hemitrygon laosensis (Roberts & Karnasuta, 1987) Fr, Fi native   62.00 cm WD male/unsexed  Reported from Mekong river (Chiang Rai), Nong Khai and Loei (Ref. 37773) and Chao Phraya basin (Ref. 9840). Found in Chiang Kham dist. Chieng Rai province (Ref. 33021). Caught with seines or hook and lines and sold fresh in local markets (Ref. 32457). Museum: Mekong river Chiang Kham district, Chieng Rai province, Thailand, BMNH 1985.9.26.1-2 (Ref. 31982). Also Ref. 9840, 11430, 26636, 43281. 
Cyprinidae Henicorhynchus caudiguttatus (Fowler, 1934) Fr native  Spotted mud carp (English)  5.94 cm SL male/unsexed  Type locality of Henicorhynchus caudiguttatus, Chieng Mai (Ref. 123185).  No picture yet.
Cyprinidae Henicorhynchus caudimaculatus (Fowler, 1934) Fr native  Striped mud carp (English), Pla soi lai (Thai), ปลาสร้อยลาย (Thai) occasional (usually not seen) 26.60 cm TL male/unsexed  Known to occur in the Chao Phraya basin (Ref. 27732, 33488). Reported from Maeklong, Mekong and Southeastern Thailand river systems (Ref. 26336, 123185); also from Phra Nakhon Si Ayutthaya, Uthai Thani, Nakhon Sawan, Phitsanulok, Phrae, Chiang Mai, Chiang Rai, Nong Khai, Khon Kaen, Kanchanaburi, Prachin Buri and Surat Thani (Ref. 37773). This species was reported to be extremely common in central Thailand (Ref. 12693) but apparently is greatly reduced and may be nearing extinction (Ref. 33488). Known to migrate up small rivers and streams and out into floodplains. Begins to return to permanent waters in October with migration peaking in November and December (Ref. 12693). Museum: Mekong mainstream, CAS 96196 (between Pak Ing and Jom Paeng, about 4-5 km downstream); CAS 91766 (from Pak Ing to Tom Paeng, 4-5 km downstream) (Ref. 5515). Also Ref. 26580. 
Cyprinidae Henicorhynchus entmema (Fowler, 1934) Fr native  Notched mud carp (English)  15.00 cm SL male/unsexed  Recorded from the Mekong basin (Ref. 33488), Me Kok near Cheng rai (Ref. 33021) and Chao Phraya (Ref. 26580). Museum: Mekong, CAS 96206 (near Chiang Saen); CAS 96193 (Huay Nam Ngam & Mekong mainstream near That Phanom); CAS 96203 (Mekong mainstream between Pak Ing and Jom Paeng, 4-5 km downstream); CAS 96202 (Mekong mainstream near Chiang Saen) (Ref. 5515); also from Phra Nakhon Si Ayutthaya, Uthai Thani, Nakhon Sawan, Phitsanulok, Phrae, Chiang Mai, Nong Khai, Khon Kaen, Kanchanaburi, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 43281. 
Cyprinidae Henicorhynchus ornatipinnis (Roberts, 1997) Fr native  Red-finned mud carp (English)  9.50 cm SL male/unsexed  Known from the middle Mekong basin of northeastern Thailand (Ref. 33488). Also Ref. 43281. 
Cyprinidae Henicorhynchus siamensis (Sauvage, 1881) Fr native   20.00 cm SL male/unsexed 20 TL Known from the Chao Phraya and the Mekong basins (Ref. 10431, 26580, 33488, 43281); including Bang Pakong, Mae Klong and Phetchaburi basins (Ref. 123185) . From Xayabouri in Laos to Chiang Khong this species is reported to migrate upstream from March to July, first by juveniles, later by adults (Ref. 37770). Museum: Mekong, CAS 79183 (ca. 4 km downriver from Pak Ing, ca 25 km downriver from Chiang Khong); CAS 96188 (near Chiang Saen) (Ref. 5515). Also Ref. 1632, 12693, 27732, 36654. 
Heteropneustidae Heteropneustes fossilis (Bloch, 1794) Fr, Fi questionable   41.20 cm TL male/unsexed  Outside distributional range, likely a misidentification of H. fossilis. Found in the Chao Phraya and its tributaries (Ref. 1632); also from Surat Thani, Nakhon Sawan, Trang, Nakhon Nayok river and Kemarat (Ubon Ratchathani) (Ref. 37773). Also Ref. 4833, 41236, 43640. 
Heteropneustidae Heteropneustes kemratensis (Fowler, 1937) Fr native   27.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 43281). Type locality, Kemrat (Ref. 40966). Probably extinct in both basins (Ref. 43281). 
Dorosomatidae Hilsa kelee (Cuvier, 1829) Fr, Br, M, Fi native  Pla mong groey (Thai), Mark pang (Thai), Mong (Thai), Pla mark phak (Thai), Pla mark phang (Thai), Pla mong grow (Thai), Pla tao muk gao (Thai), Pla toa mak goaw (Thai), ปลาตั้วมั่กโก๊ว (Thai), ปลามงโกรย (Thai), ปลาหมากผาง (Thai), ปลาโมงโกรย (Thai)  35.00 cm TL male/unsexed  Found in the Mekong River and its tributaries (Ref. 9648). Reported from Prachuap Khiri Khan (Ref. 37773). Also Ref. 188, 9684. 
Dasyatidae Himantura krempfi (Chabanaud, 1923) Fr native   40.00 cm WD male/unsexed  Usually caught in the tidal influences and freshwater reaches of the Bangpakong and Chao Phraya rivers with set nets and push seines and sold to aquarium fish dealers (Ref. 32457). Also Ref. 32444, 37773. 
Syngnathidae Hippichthys penicillus (Cantor, 1849) Fr, Br, M native  Chimfanchorakhe (Thai), จิ้มฟันจระเข้ (Thai)  18.00 cm SL male/unsexed  Also Ref. 52823. 
Balitoridae Homaloptera bilineata Blyth, 1860 Fr native   10.00 cm NG male/unsexed  Recorded from the Maeklong river (Ref. 78705). 
Balitoridae Homaloptera confuzona Kottelat, 2000 Fr native   6.80 cm SL male/unsexed  Known from small coastal basins in southeastern Thailand (Ref. 36949). Also Ref. 43281 and 78705. 
Balitoridae Homaloptera orthogoniata Vaillant, 1902 Fr native   13.00 cm SL male/unsexed  Known from Nakhon Nayok and Chanthaburi (Ref. 37773). Also Ref. 7050. 
Balitoridae Homaloptera parclitella Tan & Ng, 2005 Fr native   10.02 cm SL male/unsexed    No picture yet.
Balitoridae Homalopteroides modestus (Vinciguerra, 1890) Fr native   2.10 cm SL male/unsexed  Known from Lop Buri, Chanthaburi and Nakhon Si Thammarat (Ref. 37773). Also Ref. 4832.  No picture yet.
Balitoridae Homalopteroides smithi (Hora, 1932) Fr native   9.80 cm TL male/unsexed  Occurs in the Mekong, Chao Phraya (Ref. 27732), Chiengsen Kao (Ref. 33021), Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336). Collected in the Mekong basin at Nam Man about 2 km upstream of Amphoe Dan Sai in Loei Province and at Mae Nam Fang, 35 km south of Fang on road to Chiang Mai, Chiang Mai Province (Ref. 39226); also from Phrae, Chanthaburi, Nakhon Si Thammarat and Surat Thani (Ref. 37773). Also Ref. 36654, 26580, 78705. 
Bagridae Hyalobagrus ornatus (Duncker, 1904) Fr, Or native   3.00 cm SL male/unsexed   
Xenocyprididae Hypophthalmichthys molitrix (Valenciennes, 1844) Fr, Fi, Aq introduced  Pla lin (Thai), Pla leng hea (Thai), Pla leng heu (Thai), Pla pae long (Thai), Pla pea long (Thai), Pla pin hea (Thai), Pla pin heu (Thai), ปลาพิ่นฮื้อ (Thai), ปลาเล่งฮื้อ (Thai), ปลาแป๊ะหลง (Thai), Silver carp (English)  120 cm TL male/unsexed  Known from Bangkok (Ref. 37773). Stocked into the Sirikit (1973) and Ubolratana (1970) reservoirs (Ref. 12240). Established in aquaculture through assisted/artificial reproduction but not in the wild (Ref. 1739). One of the fish used for the extension of fish culture by the Fisheries Department. The flesh has good flavour and is highly priced (Ref. 6459). Probably established (Ref. 58915). Also Ref. 1632. 
Xenocyprididae Hypophthalmichthys nobilis (Richardson, 1845) Fr, Fi, Ex introduced  Pla song hea (Thai), Pla song heu (Thai), Pla tao teo (Thai), ปลาซ่งฮื้อ (Thai), ปลาเต๋าเต้ย (Thai), Big head carp (English)  146 cm SL male/unsexed  One of the cultivatable fishes introduced by the Fishes Department. Highly priced food fish (Ref. 6459). Stocked into the Sirikit (1973), Chulaporn (1972 and 1975) and Ubolratana (1970) reservoirs. Difficult to breed. Also Ref. 1632, 13364, 58848. 
Hemiramphidae Hyporhamphus limbatus (Valenciennes, 1847) Fr, Br, M native  Khempakdaeng (Thai), เข็มปากแดง (Thai)  35.00 cm TL male/unsexed  Also Ref. 4833, 52823. 
Loricariidae Hypostomus plecostomus (Linnaeus, 1758) Fr introduced  common (usually seen) 24.98 cm SL male/unsexed  Fishermen are catching significant numbers of this fish. Dr. Amararatne Yakupitiyage (pers. comm) July 22, 2004. 
Cyprinidae Hypsibarbus lagleri Rainboth, 1996 Fr native   40.00 cm SL male/unsexed  Known from the Mekong River. Also Ref. 43281. 
Cyprinidae Hypsibarbus malcolmi (Smith, 1945) Fr native   50.00 cm SL male/unsexed  Known from Maeklong, Chao Phraya, Mekong and Peninsular Thailand river systems (Ref. 26336). Museum: Mekong river at Chiang Khan, CAS 63040 (Ref. 5515); also from Mae Ping (Chiang Mai), Mae Hong Son and Trat (Ref. 37773). Also Ref. 26580, 43281. 
Cyprinidae Hypsibarbus pierrei (Sauvage, 1880) Fr native   36.90 cm TL male/unsexed  Occurs in the Mekong River (Ref. 26336). Type locality: Rapids of Dang-nai, Bien Hoa Prov., Thailand. Also Ref. 33021, 36654. 
Cyprinidae Hypsibarbus salweenensis Rainboth, 1996 Fr native   35.00 cm NG male/unsexed  Type locality: Salween R. midway between Mae Sam Laep and Paleh, Maehongsorn, Thailand. 
Cyprinidae Hypsibarbus suvattii Rainboth, 1996 Fr native   35.00 cm SL male/unsexed  Known from Mae Khlong basin and from South-East Thailand (Ref. 26580). Also Ref. 12693. 
Cyprinidae Hypsibarbus vernayi (Norman, 1925) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya and Meklong basins (Ref. 26580, 27732, 26336, 43281); also from Kanchanaburi, Surat Thani and Chanthaburi (Ref. 37773). 
Cyprinidae Hypsibarbus wetmorei (Smith, 1931) Fr native  Peek (Thai), Pla ta paak (Thai), Pla ta pak (Thai), ปลาตะพาก (Thai)  46.00 cm TL male/unsexed  Known from the Chao Phraya, Mekong, Maeklong and Peninsular Thailand river systems (Ref. 26336). Reported from Phrae, Phitsanulok, Kanchanaburi, Nong Khai, Chanthaburi, Surat Thani, Kemarat (Ubon Ratchathani), and Chai Nat (Ref. 37773). Museum: Mekong river at Chiang Khan, CAS 63036 (Ref. 5515). Also Ref. 12041, 26580, 43281. 
Syngnathidae Ichthyocampus carce (Hamilton, 1822) Fr native   15.00 cm male/unsexed  Reported from Bang Pakong river (Chachoengsao) and Mae Klong river Samut Songkhram) (Ref. 37773). Also Ref. 5316. 
Ictaluridae Ictalurus punctatus (Rafinesque, 1818) Fr not established   132 cm TL male/unsexed   
Pristigasteridae Ilisha kampeni (Weber & de Beaufort, 1913) Fr, Br, M native   15.00 cm SL male/unsexed  Reported from Songkhla lake (Ref. 37773). 
Pristigasteridae Ilisha megaloptera (Swainson, 1838) Fr, Br, M, Fi native   36.50 cm SL male/unsexed  Known from Chanthaburi and Chon Buri (Ref. 37773). Occurrence in the Pacific side (Ref. 1632) needs to be confirmed. Also Ref. 188. 
Cyprinidae Incisilabeo behri (Fowler, 1937) Fr native  Pla nga (Thai), Pla na nor (Thai), Pla nha nor (Thai), Pla va (Thai), Pla va ho kham (Thai), ปลางา (Thai), ปลาหน้านอ (Thai), ปลาหว้า (Thai)  60.00 cm TL male/unsexed  Occurs in the Mekong, Maeklong and Chao Phraya basins (Ref. 26336); also from Kemarat (Ubon Ratchathani) and Mae Hong Son (Ref. 37773). Also Ref. 9648, 10421, 43281. 
Indostomidae Indostomus crocodilus Britz & Kottelat, 1999 Fr native   2.45 cm SL male/unsexed  Type locality: Nae Nam Tod Deng, Narathiwat Province. Inhabits primary peats from Toh Daeng Peat (Ref. 57235). 
Indostomidae Indostomus paradoxus Prashad & Mukerji, 1929 Fr native   3.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya and Peninsular Thailand river systems (Ref. 26336). Also Ref. 36654. 
Indostomidae Indostomus spinosus Britz & Kottelat, 1999 Fr native   3.00 cm SL male/unsexed  Found in the Mekong basin at Nong Khai Province. Also Ref. 43281. 
Sciaenidae Johnius novaehollandiae (Steindachner, 1866) Fr questionable    Reported from Krabi (Ref. 37773). Outside distributional range, occurrence needs verification.  No picture yet.
Sciaenidae Johnius trachycephalus (Bleeker, 1851) Fr, Br, M, Fi native   13.00 cm SL male/unsexed  Known from Tha Chin river (Samut Sakhon), Krabi, Tale Sap at Pak Payoon (Phatthalung) and Songkhla (Ref. 37773). Also Ref. 9772. 
Ariidae Ketengus typus Bleeker, 1846 Fr, Br native   25.00 cm TL male/unsexed  Known from Bangkok, Bang Pakong river (Chachoengsao), Phatthalung and Samut Prakan (Ref. 37773). Also Ref. 7050, 4833, 12693. 
Siluridae Kryptopterus bicirrhis (Valenciennes, 1840) Fr, Or native  Pla kra jok (Thai), Pla kang pra ruong (Thai), Pla pe sard (Thai), Pla pee sard (Thai), Pla phee (Thai), Pra ruong (Thai), ปลากระจก (Thai), ปลาก้างพระร่วง (Thai), ปลาปีศาจ (Thai), ปลาผี (Thai), Ghost fish (English)  15.00 cm SL male/unsexed  Found in the Chao Phraya and Mekong basins (Refs. 9648; 27732); also from Bangkok, Nakhon Nayok, Phra Nakhon Si Ayutthaya and Phitsanulok (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 1632, 57235. 
Siluridae Kryptopterus cheveyi Durand, 1940 Fr native   35.00 cm TL male/unsexed  Occurs in the Chao Phraya, Mekong and Southeast Thailand river systems. Also Ref. 27732. 
Siluridae Kryptopterus cryptopterus (Bleeker, 1851) Fr native  Pla hang kai (Thai), Pla nua on (Thai), ปลาหางไก่ (Thai), ปลาเนื้ออ่อน (Thai)  24.00 cm TL male/unsexed  Occurs in Peninsular and Southeast Thailand river systems (Ref. 26336). Also Ref. 2091, 36654, 37773. 
Siluridae Kryptopterus dissitus Ng, 2001 Fr, Thr native  Indochinese sheatfish (English)  17.60 cm SL male/unsexed  Collected from Mae Nam Chao Phraya at Bangkok (Ref. 42937). Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Endangered (Ref. 58784).  No picture yet.
Siluridae Kryptopterus geminus Ng, 2003 Fr native   17.06 cm SL male/unsexed  Known from the Mekong, Bang Pakong, Chao Phraya and Mae Khlong River drainages (Ref. 50583). 
Siluridae Kryptopterus hesperius Ng, 2002 Fr, Thr native  Maeklong sheatfish (English)  24.90 cm SL male/unsexed  Known from the Mae Khlong River drainage in western Thailand. Type locality, Kwae Noi River at Sai Yok in the Kanchanaburi province (Ref. 42937). Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Endangered (Ref. 58784).  No picture yet.
Siluridae Kryptopterus limpok (Bleeker, 1852) Fr, Thr native  Long-barbel sheatfish (English)  26.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya and Maeklong basins. Also recorded from Bang Pakong river (Chachoengsao) (Ref. 37773). Threatened due to habitat loss (Ref. 58784). Also Ref. 2091, 43281. Status of threat: Endangered (Ref. 58784). 
Siluridae Kryptopterus macrocephalus (Bleeker, 1858) Fr native   9.70 cm SL male/unsexed  Known from Mekong baoin to Malay peninsula (Ref. 57235); also from Narathiwat (Ref. 37773). 
Siluridae Kryptopterus palembangensis (Bleeker, 1852) Fr, Or native   17.00 cm TL male/unsexed  Known from the Mekong, Peninsular and Southeast Thailand river systems. Also Ref. 57235. 
Siluridae Kryptopterus vitreolus Ng & Kottelat, 2013 Fr native  Glass catfish (English)  6.46 cm SL male/unsexed  Found in the short, coastal drainages in peninsular Thailand debouching into the Gulf of Thailand south of the Isthmus of Kra (from about 8°38'N to 6°2'N), as well as similar rivers draining the southeastern face of the Khao Banthat (Cardamom) Mountains in southeastern Thailand (Ref. 93176).  No picture yet.
Cyprinidae Labeo barbatulus (Sauvage, 1878) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Cyprinidae Labeo calbasu (Hamilton, 1822) Fr, Fi native   90.00 cm TL male/unsexed  Known from Salween river (Mae Hong Son) (Ref. 37773). Also Ref. 2073, 41236, 43640. 
Cyprinidae Labeo catla (Hamilton, 1822) Fr, Fi not established  Pla kra ho (Thai), Pla kaho tad (Thai), ปลากระโห้ (Thai)  182 cm TL male/unsexed   
Cyprinidae Labeo chrysophekadion (Bleeker, 1849) Fr, Fi, Or native  Pla ka (Thai), Ka (Thai), Pla ka dam (Thai), Pla peea (Thai), ปลากา (Thai), ปลากาดำ (Thai), ปลาเพี้ย (Thai), Black shark (English)  90.00 cm TL male/unsexed  Found in the Chao Phraya, Mekong River, Maeklong, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). In the Mekong basin, it migrates upstream from March to August. Known to migrate into tribuatries, small streams and canals and migration commences at the onset of the rainy season or when the water starts rising (Ref. 37770). Has an important spawning ground in Bung Borapet swamp in the Chao Phraya catchment (Ref. 37770). Captured from the wild for the ornamental fish trade (Ref. 6459). Museum: Mekong mainstream between Pak Ing and Jom Paeng, about 4-5 km downstream, CAS 95582 (Ref. 5515); also from Bangkok, Nonthaburi, Phra Nakhon Si Ayutthaya, Nakhon Sawan, Chiang Mai, Kanchanaburi, Kemarat (Ubon Ratchathani), Khon Kaen and Surat Thani (Ref. 37773). Also Ref. 1632, 26580, 27732, 36654, 43281. 
Cyprinidae Labeo dyocheilus (McClelland, 1839) Fr native   90.00 cm TL male/unsexed  Known from Salween, Maeklong, Chao Phraya and Mekong basins (Ref. 26336); also from Bangkok, Kanchanaburi, Phra Nakhon Si Ayutthaya, Phitsanulok, Chiang Rai, Mae Hong Son and Nakhon Phanom (Ref. 37773). Also Ref. 26580, 27732, 36654. 
Cyprinidae Labeo indramontri Smith, 1945 Fr native    Known from the Chao Phraya basin. Also recorded from Nakhon Sawan and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 26580.  No picture yet.
Cyprinidae Labeo pierrei (Sauvage, 1880) Fr native   80.00 cm SL male/unsexed  Known from the Mekong (Ref. 43281) and Chao Phraya basins (Ref. 26580); also from Phitsanulok (Ref. 37773). Type locality: Rapids of Dang-nai, Bien Hoa Province. Also Ref. 43281. 
Cyprinidae Labeo rohita (Hamilton, 1822) Fr, Fi, Aq introduced  Rohu (Thai), Pla yee sok tad (Thai), Pla yee sok tead (Thai), ปลายี่สกเทศ (Thai)  200 cm TL male/unsexed  Also Ref. 1632, 9987, 58848, 58915. 
Cyprinidae Labeo yunnanensis Chaudhuri, 1911 Fr native   49.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins. 
Cyprinidae Labiobarbus leptocheilus (Valenciennes, 1842) Fr native  Pla soi (Thai), Pla lao tong (Thai), Pla soi luk noon (Thai), Pla soi luk nun (Thai), Pla soi nok khao (Thai), Sa (Thai), ปลาสร้อย (Thai), ปลาสร้อยนกเขา (Thai), ปลาสร้อยลูกนุ่น (Thai), ปลาหลาวทอง (Thai)  30.00 cm SL male/unsexed  Occurs throughout the country (Ref. 7424). Known from the Mekong, Chao Phrya, Tapi and Rayong (Ref. 2091), Maeklong and Peninsular Thailand rivers systems (Ref. 26336). Reported also from Bangkok, Nonthaburi, Nakhon Sawan, Nan, Phra Nakhon Si Ayutthaya, Phrae, and Chanthaburi (Ref. 37773). Museum: Mekong mainstream, CAS 79157 (Bung Kan); CAS 96297 (between Pak Ing and Jom Paeng, about 4-5 km downstream) (Ref. 5515). Occurrence of the species L. burmanicusin Chao Phraya needs further confirmation (Ref. 26580). Also Ref. 7050, 9648, 36654, 43281. 
Cyprinidae Labiobarbus lineatus (Sauvage, 1878) Fr native   15.50 cm TL male/unsexed  Reported from Phitsanulok, Chiang Mai, Chiang Rai, Chantaburi, Phra Nakhon Si Ayutthaya, Khon Kaen, Surat Thani, Ubon Ratchathani and Kanchanaburi (Ref. 37773). 
Cyprinidae Labiobarbus siamensis (Sauvage, 1881) Fr native   22.00 cm TL male/unsexed  Known from the Chao Phraya, Mekong (Ref. 7424), Maeklong and Souhtheast Thailand river systems (Ref. 26336). Reported from Pathum Thani, Phitsanulok, Chiang Mai, Phetchaburi, Trang, Krabi, Khon Kaen, Phrae, Nakhon Nayok, Chiang San (Chiang Rai), Kemarat (Ubon Ratchathani), Uthai Thani, Kanchanaburi, and Prachin Buri (Ref. 37773). Also Ref. 26580, 43281. 
Ailiidae Laides hexanema (Bleeker, 1852) Fr questionable  Pla sang ka ward (Thai), Pla sang ka wart (Thai), Pla yon (Thai), ปลายอน (Thai), ปลาสังกะวาด (Thai)  16.50 cm TL male/unsexed  Outside distributional range; likely a misidentification of L. longibarbis. Reported from the Mekong, Maeklong and peninsular Thailand river systems (Ref. 26336). Museum: Huay Phai, at confluence with Mekong river, 7 km upstream on Mekong river from Mun river confluence, Changwat Ubon, CAS 60770; Huay Mark, 8 km N. of Khong Chiam at confluence with Mekong river, Changwat Ubon Ratchathani, CAS 60769 (Ref. 5515); also from Phra Nakhon Si Ayutthaya, Chai Nat, Nakhon Sawan, Nakhon Nayok and Khon Kaen (Ref. 37773). Also Ref. 9648. 
Ailiidae Laides longibarbis (Fowler, 1934) Fr native   14.20 cm SL male/unsexed  Museum: Mekong at Chieng Sen, ANSP 59441 (holotype, 9.37 cm SL) (Ref. 39209); also from Chiang San (Chiang Rai) (Ref. 37773). Also Ref. 43281. 
Danionidae Laubuka caeruleostigmata Smith, 1931 Fr, Or, Thr native  Indian glass fish (English)  7.00 cm SL male/unsexed  Occurs in the Maeklong, Chao Phraya and Mekong rivers (Ref. 26336). Reported from below Nakon Sawan, near Sainat; also Pasak River, Pechabun (Phetchabun) (Ref. 1632); also from Phitsanulok, Chai Nat, Phra Nakhon Si Ayutthaya, and Phetchaburi (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 26580, 36654, 43281. Status of threat: Critically Endangered (Ref. 58784). 
Danionidae Laubuka laubuca (Hamilton, 1822) Fr, Or native  Indian glass fish (English)  10.54 cm TL male/unsexed  Known from the Mekong (Ref. 43281), Chao Phraya and Mae Khlong basins (Ref. 26580). Found in Trang (Ref. 1632); also from Surat Thani and Sakon Nakhon (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 36654, 41236. 
Danionidae Laubuka siamensis Fowler, 1939 Fr native    Found in waterfall at Trang (Ref. 94476).  No picture yet.
Bagridae Leiocassis poeciloptera (Valenciennes, 1840) Fr native   17.00 cm SL male/unsexed  Known from Chanthaburi, Kanchanaburi, Khon Kaen and Chumphon (Ref. 37773). Also Ref. 7050. 
Apogonidae Lepidamia multitaeniata (Cuvier, 1828) Fr questionable   18.00 cm TL male/unsexed  Reported from Chanthaburi (Ref. 37773). Outside distributional range, occurrence needs verification. 
Cobitidae Lepidocephalichthys berdmorei (Blyth, 1860) Fr native   8.00 cm SL male/unsexed  Found in the Chao Phraya, Mekong, Salween, Maeklong and Peninsular Thailand river systems (Ref. 26336). Collected at Nam Mae Mao at Ban Huai Phak Phai in the Mekong basin of Chiang Mai Province (Ref. 39226); also from Salween river and Trang (Ref. 37773). Also Ref. 1632, 12041, 26580, 41236, 43281. 
Cobitidae Lepidocephalichthys birmanicus (Rendahl, 1948) Fr native   11.00 cm male/unsexed  Known from the Mekong basin on the Khorat Plateau. 
Cobitidae Lepidocephalichthys furcatus (de Beaufort, 1933) Fr native   5.00 cm SL male/unsexed  Known from the river systems of Peninsular Thailand, Mekong and Chao Phraya (Ref. 26336). Recorded from Northeast and Central Thailand (Ref. 57235). Also Ref. 43281.  No picture yet.
Cobitidae Lepidocephalichthys guntea (Hamilton, 1822) Fr native   15.00 cm TL male/unsexed   
Cobitidae Lepidocephalichthys hasselti (Valenciennes, 1846) Fr native   6.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). Collected in the Mekong basin at Nam Man about 2 km upstream of Amphoe Dan Sai in Loei Province and in the Mae Nam Ping basin at the Ban Na Hwai (Ref. 39226); also from Trang (Ref. 37773). Also Ref. 7050, 26580, 57235. 
Cobitidae Lepidocephalichthys kranos Havird & Page, 2010 Fr native   3.31 cm SL male/unsexed ;4.36 cm SL female    No picture yet.
Cobitidae Lepidocephalichthys micropogon (Blyth, 1860) Fr native   6.00 cm NG male/unsexed  Found in the Chao Phraya basin. 
Cobitidae Lepidocephalichthys zeppelini Havird & Tangjitjaroen, 2010 Fr native   2.60 cm SL male/unsexed  Known from the Mekong drainage (Ref. 84769).  No picture yet.
Cobitidae Lepidocephalus macrochir (Bleeker, 1854) Fr native   9.00 cm TL male/unsexed   
Cobitidae Lepidocephalus nanensis Deein, Tangjitjaroen & Page, 2014 Fr native  Thai spirit loach (English)  8.01 cm SL male/unsexed  Known from the Nan River and Chao-Phraya River below the confluence of the Nan and Yom rivers (Ref. 95334).  No picture yet.
Leptobarbidae Leptobarbus hoevenii (Bleeker, 1851) Fr, Fi, Ex, Or native  Pla ai baa (Thai), Ba (Thai), Pla ai ba (Thai), Pla ba (Thai), Pla baa (Thai), Pla hang deng (Thai), ปลาบ้า (Thai), ปลาอ้ายบ้า (Thai), Pink tailed barb (English)  100.00 cm SL male/unsexed  Known from Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river sytems (Ref. 26336). Reported from Bangkok, Nakhon Ratchasima, and Phra Nakhon Si Ayutthaya (Ref. 37773). Main culture location is Bangkok (Ref. 6459). Also Ref. 1632, 2091, 7050, 9648, 26580, 36654, 43281. 
Leptobarbidae Leptobarbus melanotaenia Boulenger, 1894 Fr native   50.00 cm TL male/unsexed   
Leptobarbidae Leptobarbus rubripinna (Fowler, 1937) Fr native    Type locality, Kemrat [Kamarat], Thailand (Ref. 81932).  No picture yet.
Lethrinidae Lethrinus nebulosus (Forsskål, 1775) Fr, Br, M, Fi, Lf native  Pla moo-see-naayan (Thai), Pla moo see pha (Thai)  87.00 cm TL male/unsexed  Reported from Rayong and Klong Wan (Prachuap Khiri Khan) and Andaman Sea (Ref. 37773). Also Ref. 2295. 
Cyprinidae Lobocheilos bo (Popta, 1904) Fr, Br, M native   32.50 cm SL male/unsexed  Known from the Chao Phraya basin; also from Nakhon Nayok, Songkhla and Chiang Rai (Ref. 37773). Also Ref. 26580. 
Cyprinidae Lobocheilos cornutus Smith, 1945 Fr native    Reported from Surat Thani and Kanchanaburi (Ref. 37773). Type locality: Klong Chawang, a mountain stream east of Bandon, Peninsular Thailand (Ref. 33021). In range Ref. 26580, 33021. 
Cyprinidae Lobocheilos cryptopogon (Fowler, 1935) Fr native   15.00 cm TL male/unsexed  Known from the Chao Phrya and Mekong basins (Ref. 26336); also from Chiang San (Chiang Rai) (Ref. 37773). Museum: Mekong mainstream, CAS 91766 (from Pak Ing to Tom Paeng, 4-5 km downstream); CAS 96196 (between Pak Ing and Jom Paeng, about 4-5 km downstream) (Ref. 5515). Also Ref. 1632, 12693, 26580. 
Cyprinidae Lobocheilos davisi (Fowler, 1937) Fr native   9.00 cm TL male/unsexed  Reported from Kemarat (Ubon Ratchathani) (Ref. 37773). 
Cyprinidae Lobocheilos delacouri (Pellegrin & Fang, 1940) Fr native   12.00 cm SL male/unsexed  Found in the Mekong and Chao Phraya basins (Ref. 26336). In range Ref. 12693, 12041. 
Cyprinidae Lobocheilos gracilis (Fowler, 1937) Fr native  common (usually seen) 24.00 cm TL male/unsexed  Known from the Chao Phrya and Mekong basins (Ref. 12693); also from Kemarat (Ubon Ratchathani), Chiang Mai, Chiang Rai and Surat Thani (Ref. 37773). Commonly found in the upper Mekong of northern Thailand (Ref. 12693). Also Ref. 26580. 
Cyprinidae Lobocheilos melanotaenia (Fowler, 1935) Fr native   20.00 cm SL male/unsexed  Found in the Chao Phraya and Mekong basins (Ref. 26336); also from Kemarat (Ubon Ratchathani), Phitsanulok and Phrae (Ref. 37773). Also Ref. 1632, 12041, 12693, 26580, 27732, 36654, 43281. 
Cyprinidae Lobocheilos nigrovittatus Smith, 1945 Fr endemic    Known from the Chao Phraya basin; also from Nakhon Nayok, Kanchanaburi, Sakon Nakhon and Phrae (Ref. 37773). Also Ref. 26580. 
Cyprinidae Lobocheilos quadrilineatus (Fowler, 1935) Fr native   28.00 cm TL male/unsexed  Found in the Chao Phraya basin as well as streams of the Gulf of Thailand (Ref. 12693) and Mekong basin (Ref. 26336); also from Si Sawat (Kanchanaburi), Khon Kaen, Yala, Phrae and Surat Thani (Ref. 37773). Also Ref. 1632, 12041, 26580. 
Cyprinidae Lobocheilos rhabdoura (Fowler, 1934) Fr native   22.00 cm SL male/unsexed  Found in streams of the Chao Phraya, Mekong and Southeast Thailand (Ref. 26336); also from Chiang Mai, Lampang, Chiang Rai, Kalasin, Khon Kaen, Nong Khai, Kanchanaburi, Phrae and Surat Thani (Ref. 37773). Also Ref. 1632, 12041, 12693, 26580, 36654, 43281. 
Cyprinidae Lobocheilos thavili Smith, 1945 Fr endemic    Known from the Chao Phraya basin (Ref. 26580) and Mekong at Rajaburi, central Thailand (Ref. 33021). Also reported from Ratchaburi (Ref. 37773).  No picture yet.
Cyprinidae Lobocheilos trangensis (Fowler, 1939) Fr native    Type locality: Waterfall at Trang, Thailand. In range Ref. 26580. Also Ref. 33021.  No picture yet.
Xenocyprididae Longiculter siahi Fowler, 1937 Fr native   20.00 cm SL male/unsexed  Known from the Chao Phraya (Ref. 12041) and Mekong basins (Ref. 26336); also from Phitsanulok (Ref. 37773). Also Ref. 26580, 36654. 
Osphronemidae Luciocephalus pulcher (Gray, 1830) Fr native   20.00 cm SL male/unsexed  Found in Narathiwat Province (Ref. 56386). Also Ref. 37773. 
Danionidae Luciosoma bleekeri Steindachner, 1878 Fr native   25.00 cm SL male/unsexed  Known from the Meklong (Ref. 12041), Chao Phraya and Mekong basins (Ref. 26336); also from Phra Nakhon Si Ayutthaya, Chai Nat, Nakhon Nayok, Kanchanaburi, Nakhon Sawan, Phrae, Chiang Mai and Surat Thani (Ref. 37773). Also Ref. 12693, 26580, 36654, 43281. 
Danionidae Luciosoma setigerum (Valenciennes, 1842) Fr native  Pla ao (Thai), Pla ai ao (Thai), ปลาอ้ายอ้าว (Thai), ปลาอ้าว (Thai)  26.00 cm SL male/unsexed  Known from the Maeklong, Peninsular Thailand, Chao Phraya and Mekong river systems (Ref. 26336). Occurrence needs further confirmation in Chao Phraya (Ref. 26580); also from Nonthaburi, Nakhon Sawan, Chiang Mai, Chiang Rai, Pattani and Yala (Ref. 37773). Also Ref. 9648, 37773, 43281. 
Danionidae Luciosoma spilopleura Bleeker, 1855 Fr, Or native  Apollo shark (English)  25.00 cm TL male/unsexed  Occurs in Thon Buri (Ref. 1632); also from Bangkok (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 4537. 
Lutjanidae Lutjanus argentimaculatus (Forsskål, 1775) Fr, Br, M, Fi, Lf native  Kaphongsilueat (Thai), Pla kapong-daeng-pakmenam (Thai), Pla luk kapong deang (Thai), กะพงสีเลือด (Thai)  150 cm TL male/unsexed  Known from Klong Wan (Prachuap Khiri Khan), Thai waters, Trat, Chumphon, Surat Thani and Ranong (Ref. 37773). Also Ref. 55, 52823. 
Engraulidae Lycothrissa crocodilus (Bleeker, 1850) Fr, Br native  Pla meo (Thai), ปลาแมว (Thai)  30.00 cm SL male/unsexed  Occurs in Maenam Chao Phaya (Chao Phraya) (Ref. 1632); also from Phra Nakhon Si Ayutthaya, Khon Kaen, Ubon Ratchathani, Chiang Rai, Nakhon Sawan and Nonthaburi (Ref. 37773). Also Ref. 2091, 36654. 
Xenocyprididae Macrochirichthys macrochirus (Valenciennes, 1844) Fr, Fi, Thr native  Sward minnow (English), Pla thong plu (Thai), Dab lao (Thai), Pla dab lao (Thai), Pla pak pra (Thai), Pla phak pra (Thai), Pla tong plu (Thai), ปลาดาบลาว (Thai), ปลาท้องพลุ (Thai), ปลาผักพร้า (Thai)  100.00 cm TL male/unsexed  Occurs in Peninsular Thailand, Chao Phraya and Mekong river systems (Ref. 26336). Also Menam Nan; Maeklong River; Thale Sap, Phathalung; Tapi river, Bandon (Ref. 1632), Chieng Sen (Ref. 33021); also from Nonthaburi, Phra Nakhon Si Ayutthaya, Ratchaburi, Chiang Rai, Nong Khai, Surat Thani and Songkhla (Ref. 37773). It may have disappeared from the Chao Phraya (Ref. 12369). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 2686, 7050, 9648, 36654, 26580, 43281, 45563. Status of threat: Endangered (Ref. 58784). 
Mastacembelidae Macrognathus aculeatus (Bloch, 1786) Fr, Br, Or native  Pla lod jud (Thai), Pla lod (Thai), ปลาหลด (Thai), ปลาหลดจุด (Thai), Spiny eel (English)  38.00 cm TL male/unsexed  Found in Mekong River and its tributaries (Ref. 9648); also from Nong Mong (Nan), Krabin (Sa Kaew), Lop Buri, Chi river (Udon Thani), Sakhon Nakhon, Phra Nakhon Si Ayutthaya, Nakhon Sawan, Nong Khai, Khon Khan, Chiang Rai, Uthai Thani and Phrae (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 2073, 1632, 39392, 57235. 
Mastacembelidae Macrognathus circumcinctus (Hora, 1924) Fr, Or native   28.60 cm TL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 39392). In the Mekong basin, recorded from Mae Nam Songkhram basin in Sakhon Nakhon Province (Ref. 43281); also from Thale Sap (Phatthalung), peninsula Thailand, Chanthaburi, Nakhon Si Thammarat, Tale Noi, Klong Ranot (Songkhla), Nakhon Phanom, Phra Nakhon Si Ayutthaya and Phrae (Ref. 37773). Also Ref. 36654, 37773, 57235. 
Mastacembelidae Macrognathus maculatus (Cuvier, 1832) Fr native   28.00 cm TL male/unsexed  Uncommon from Malay peninsula to Borneo (Ref. 57235). Known from Phrae (Ref. 37773). 
Mastacembelidae Macrognathus meklongensis Roberts, 1986 Fr native   17.80 cm male/unsexed  Known from Meklong River basin (Ref. 39392). 
Mastacembelidae Macrognathus semiocellatus Roberts, 1986 Fr native   19.20 cm SL male/unsexed  Occurs in the Chao Phraya, Meklong and Mekong basins (Ref. 27732). Also known from the river systems of Southeast Thailand (Ref. 26336). Found in Ubon Ratchatani market ("presumably caught in Mun river near Ubon Ratchatani, Mekong basin") (Ref. 33021). Also Ref. 39392. 
Mastacembelidae Macrognathus siamensis (Günther, 1861) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Nong Mong (Nan), Krabin (Sa Kaew), Lop Buri, Chi river (Udon Thani), Sakhon Nakhon, Phra Nakhon Si Ayutthaya, Nakhon Sawan, Nong Khai, Khon Khan, Chiang Rai, Uthai Thani and Phrae (Ref. 37773). Also Ref. 27732, 36654, 39392, 83418. 
Mastacembelidae Macrognathus taeniagaster (Fowler, 1935) Fr native   22.00 cm TL male/unsexed  Known from Chao Phrya and Meklong basins (Ref. 12693). Museum: Huay Nam Ngam & Mekong mainstream near That Phanom, CAS 92403 (Ref. 5515); also from Chanthaburi and Sakon Nakhon (Ref. 37773). 
Mastacembelidae Macrognathus tapirus Kottelat & Widjanarti, 2005 Fr native   17.90 cm SL male/unsexed  Reported from Trang (Ref. 37773). 
Synbranchidae Macrotrema caligans (Cantor, 1849) Fr native    Known from Mae Nam Chao Praya basin. Also recorded from Tale Sap Songkhla, Pak Phayoon (Phatthalung) and Bang Pakong river (Chachoengsao) (Ref. 37773). Also Ref. 12041. 
Mastacembelidae Mastacembelus alboguttatus Boulenger, 1893 Fr native   49.00 cm TL male/unsexed  Known from the Salween basin (Ref. 39392). 
Mastacembelidae Mastacembelus armatus (Lacepède, 1800) Fr, Br, Fi, Or, Sp native   90.00 cm TL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). Occurs in Chiengmai (Chiang Mai); Menam Chao Phaya (Chao Phraya) at Koh Yai; and upper Bangpakong River (Ref. 1632). Collected at Mae Nam Fang, 35 km south of Fang on road to Chiang Mai, Mekong basin, Chiang Mai Province (Ref. 39226). Museum: Mekong river, CAS 63019 (Chiang Khan); CAS 97023 (Bung Kla, ca. 140 km nw of Nakhon Phanom) (Ref. 5515); also from Nonthaburi and Uthai Thani (Ref. 37773). Also Ref. 27732, 37770, 41236, 43640, 57235. 
Mastacembelidae Mastacembelus erythrotaenia Bleeker, 1850 Fr, Or native  Flaming eel (English)  100.00 cm TL male/unsexed  Known from Songkhla, Nakhon Pathom, Phra Nakhon Si Ayutthaya, Krabi, and Mae Lamaw (Tak) (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 39392. 
Mastacembelidae Mastacembelus favus Hora, 1924 Fr native   70.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong and Peninsular Thailand river systems (Ref. 26336); also from Nonthaburi, Tale Sap, inner lake (Songkhla), Chiang Mai, Bua Yai (Nakhon Ratchasima), Phrae and Klong Maela (Sing Buri) (Ref. 37773). Also Ref. 12693. 
Mastacembelidae Mastacembelus unicolor Cuvier, 1832 Fr native   55.00 cm TL male/unsexed  Reported from Mae Hong Son (Ref. 37773). 
Cichlidae Mayaheros urophthalmus (Günther, 1862) Fr introduced  Mayan cichlid (English), Catarrica (Spanish), False red terror (English), Mexican mojarra (English), Orange tiger (English), Mojarra del Sureste (Spanish)  39.40 cm TL male/unsexed  Year of introduction - after 2000. Recorded from the Chao Phraya river delta region. 
Megalopidae Megalops cyprinoides (Broussonet, 1782) Fr, Br, M, Fi native   150 cm TL male/unsexed  Known from Menam Chao Phaya (Chao Phraya); Gulf of Thailand; Menam Chantaburi; Krabi; Tale Sap (Thale Sap), Inner lake; and Koh Tao (Ref. 1632); also from Klong Wan (Prachuap Khiri Khan) (Ref. 37773). Also Ref. 4537. 
Cyprinidae Mekongina erythrospila Fowler, 1937 Fr native   45.00 cm SL male/unsexed  Occurs in Mekong River and its tributaries (Ref. 9648, 26336); also from Nong Khai (Ref. 37773). From Klong Kaem to Mukdahan, it undertakes upstream migration from February-April (Ref. 37770). Also migrates upstream from Pak Lay in Laos to Chiang Khong in Thailand between March and May, which starts when the first heavy rains of the monsoon season occur or when the river water changes from relatively clear to reddish or brown color (Ref. 37770). Museum: Mekong river, CAS 63048 (Chiang Khan); CAS 95537 (mainstream near Chiang Saen); CAS 96303 (Chiang Khan) (Ref. 5515); BMNH 1980.12.17.12 (Ubolrajthani); BMNH 1987.8.11.3-4 (Bandan Ubon Ratchathoni province, NE Thailand) (Ref. 31982). Also Ref. 36654, 27732, 43281. 
Danionidae Microdevario kubotai (Kottelat & Witte, 1999) Fr native   1.90 cm SL male/unsexed  Known from western slope of Peninsular Thailand, from north of Ranong to Phangnga (Ref. 38434). 
Siluridae Micronema hexapterus (Bleeker, 1851) Fr native   24.00 cm TL male/unsexed  Known from Bangkok, Chiang Mai and Bang Pakong river (Chachoengsao) (Ref. 37773). Also Ref. 7050. 
Siluridae Micronema moorei (Smith, 1945) Fr native   24.00 cm TL male/unsexed  Known from Chao Phraya (12693); and Mekong River system (Ref. 45563); also from Chai Nat and Phra Nakhon Si Ayutthaya (Ref. 37773). 
Cobitidae Misgurnus anguillicaudatus (Cantor, 1842) Fr, Fi native   28.00 cm SL male/unsexed   
Synbranchidae Monopterus albus (Zuiew, 1793) Fr, Br, Fi, Aq, Or native  Pla lai (Thai), Lai (Thai), ปลาไหล (Thai)  100.00 cm SL male/unsexed  Known from Mekong, Chao Phraya, Maeklong, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). Occurs in Chiengmai (Chiang Mai), Menam Chao Phya (Chao Phraya) at Bangkok; Phatalung (Phatthalung) River; and Koh Pa-ngan (Ref. 1632); also from Tale Sap Phatthalung, Peninsular Thailand, Mekong river (Chiang Rai), Nakhon Sawan, Chanthaburi, Mae Hong Son and Kanchanaburi (Ref. 37773). Also Ref. 9648, 27732, 37773, 57235. 
Gobiidae Mugilogobius rambaiae (Smith, 1945) Fr, Br native   4.15 cm SL male/unsexed  Type locality: shallow slough of the klong (canal) behind Department of Fisheries, central Bangkok, Nai Pongse (Ref. 43716). 
Xenocyprididae Mylopharyngodon piceus (Richardson, 1846) Fr not established   180 cm TL male/unsexed  Reported from Bangkok (Ref. 37773). 
Cyprinidae Mystacoleucus argenteus (Day, 1888) Fr native   15.00 cm NG male/unsexed  Known from Salwin river and its tributaries. Also recorded from Mae Hong Son and Tak (Ref. 37773). Also Ref. 4832. 
Cyprinidae Mystacoleucus atridorsalis Fowler, 1937 Fr native   8.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732, 26336). Museum: Mekong river at Chiang Khan, CAS 63038 (Ref. 5515); also from Kalasin, Khon Kaen, Sakon Nakhon, Kemarat (Ubon Ratchathani), Kanchanaburi and Yala (Ref. 37773). Also Ref. 43281. 
Cyprinidae Mystacoleucus chilopterus Fowler, 1935 Fr native   11.00 cm TL male/unsexed  Occurs in the mouth of Nam Mun of the Mekong (Ref. 43281), Chao Phraya and Mae Khlong basins (Ref. 26580); also from Lampang, Nan, Chiang Mai, Chiang Rai, Phitsanulok, Uthai Thani, Nakhon Nayok, Kanchanaburi, Phrae, Nakhon Si Thammarat, Patthalung, Pattani, Loei, Khon Kaen, Yala, Chumphon, Kalasin, Nakhon Ratchasima, Chanthaburi, Prachin Buri and Surat Thani (Ref. 37773). 
Cyprinidae Mystacoleucus ectypus Kottelat, 2000 Fr native   8.00 cm SL male/unsexed  Know from the Mekong basin in northeastern Thailand. Also Ref. 43281. 
Cyprinidae Mystacoleucus greenwayi Pellegrin & Fang, 1940 Fr native   7.30 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 26336); also from Chiang Rai, Phrae and Phitsanulok (Ref. 37773). Also Ref. 27732, 43281. 
Cyprinidae Mystacoleucus lepturus Huang, 1979 Fr native   9.20 cm SL male/unsexed  Occurs in the Mekong basin. 
Cyprinidae Mystacoleucus marginatus (Valenciennes, 1842) Fr native  Pla yaa (Thai), Pla khi yok (Thai), Pla nham bee (Thai), Pla ya (Thai), ปลาขี้ยอก (Thai), ปลาหญ้า (Thai), ปลาหนามบี้ (Thai)  20.00 cm TL male/unsexed  Occurs in the Mekong, Chao Phraya, and Meklong basins (Ref. 27732); also from river systems of Peninsular and Southeast Thailand (Ref. 26336). Recorded from Mekong basin in Pak Mun and Mae Nam Kok in Chiang Rai Province (Ref. 37786); also from Lampang, Nan, Chiang Mai, Phitsanulok, Uthai Thani, Nakhon Nayok, Kanchanaburi, Phrae, Nakhon Si Thammarat, Patthalung, Pattani, Loei, Khon Kaen, Yala, Chumphon, Kalasin, Nakhon Ratchasima, Chanthaburi, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 9648, 36654, 43281. 
Bagridae Mystus albolineatus Roberts, 1994 Fr native  Kayeng (Thai), Kayeng bai kao (Thai)  35.00 cm SL male/unsexed  Known from the Mekong (Ref. 26336), Bangpakong and Chao Phraya basins (Ref. 10418). Recorded from Mekong tributaries in Nakhon Phanom Province (Ref. 37786). Museum: Prachinburi market, Bangpakong basin, CAS 79030 (Holotype). Chao Phraya basin, ANSP 16453. 
Bagridae Mystus atrifasciatus Fowler, 1937 Fr native   15.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya and Meklong basins (Ref. 26336, 27732); also from Phitsanulok, Khon Kaen, Nakhon Phanom, Ubon Ratchathani, Kanchanaburi and Ratchaburi (Ref. 37773). Museum: Mekong mainstream, CAS 96722,97088 (near Chiang Saen); CAS 96739 (Huay Nam Ngam & Mekong mainstream near That Phanom); CAS 96799 (between Pak Ing and Jom Paeng, about 4-5 km downstream) (Ref. 5515). Also Ref. 12693, 26663. 
Bagridae Mystus bleekeri (Day, 1877) Fr native   17.70 cm TL male/unsexed  Reported from Mae Hong Son (Ref. 37773). 
Bagridae Mystus bocourti (Bleeker, 1864) Fr native  Pla kayeng bi kao (Thai), Pla kayeng (Thai), Pla kayeng jao (Thai), Pla kayeng jaw (Thai), Pla kayeng moo (Thai), Pla kayeng thong (Thai), Pla kayeng tong (Thai), ปลาแขยง (Thai), ปลาแขยงจ้าว (Thai), ปลาแขยงทอง (Thai), ปลาแขยงธง (Thai), ปลาแขยงหมู (Thai), ปลาแขยงใบข้าว (Thai) scarce (very unlikely) 24.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya and Maeklong basins (Ref. 26336). Rare throughout its range and is becoming rarer. Might already be gone from the Chao Phraya basin (Ref. 10418); also from Bangkok, Nakhon, Ratchasima, Phitsanulok, Pasak river (Sara Buri), Phra Nakhon Si Ayutthaya, Songkhla and Chanthaburi (Ref. 37773). Museum: Chao Phraya, MNHN 1553. Kanchanaburi market, CAS 67177 (might have been caught in Chao Phraya basin) (Ref. 10418); Ubom province, Mekong basin, market at Ubon Ratchathami, Thailand, BMNH 1992.2.11.5 (Ref. 31982); also from Also Ref. 36654. 
Bagridae Mystus cavasius (Hamilton, 1822) Fr, Fi native   40.00 cm SL male/unsexed  Occurs in the Salween basin only. Reports of this species from the Chao Phraya and Mekong basins are based on misidentification of M. albolineatus or M. singaringan (Ref. 10418); also from Phra Nakhon Si Ayutthaya, Nong Khai, Kanchanaburi, Kalasin, Surat Thani, Songkhla, Nonthaburi, Chiang Mai, Chiang Rai, Kemarat (Ubon Ratchathani), Bangkok, Nakhon Sawan, Chai Nat, Chanthaburi, Prachin Buri and Narathiwat (Ref. 37773). Museum: Mekong river at Chiang Khan, CAS 63017 (Ref. 5515). Also Ref. 41236, 43640. 
Bagridae Mystus gulio (Hamilton, 1822) Fr, Br, Fi native  Pla e-kong (Thai), I-kong (Thai), Mang korn (Thai), Pla kayeng noo (Thai), Pla mang korn (Thai), Pla yeng noo (Thai), ปลามังกร (Thai), ปลาอีกง (Thai), ปลาแขยงหนู (Thai), ปลาแหยงหนู (Thai), อีกง (Thai)  46.00 cm TL male/unsexed  Found in the Mekong River and its tributaries (Ref. 9648), Chao Phya (Chao Phraya) at Nontaburi; Bangkok; Samut Prakan; Tha-chin (Samut Sakhon) River; Krabi; Nakhon Srithamarat; and Pattani (Ref. 1632); also from Phetchaburi and Songkhla (Ref. 37773). Also Ref. 2073, 36921, 52823. 
Bagridae Mystus multiradiatus Roberts, 1992 Fr native   12.80 cm SL male/unsexed  Known from rivers and streams in the Chao Phraya and Mekong basins (Ref. 12693). Probably found in the Meklong basin (Ref. 26663); also from Prachin Buri, Nong Khai, Nakhon Sawan, Phra Nakhon Si Ayutthaya, Suphan Buri, Phitsanulok, Bangkok and Kanchanaburi (Ref. 37773). Also Ref. 26336, 43281. 
Bagridae Mystus mysticetus Roberts, 1992 Fr native  common (usually seen) 13.00 cm SL male/unsexed  Occurs in the Chao Phraya, Mekong and Maeklong basins (Ref. 26336); also from Nakhon Phanom, Suphan Buri, Ubon Ratchathani, Kanchanaburi, Bangkok, Phra Nakhon Si Ayutthaya, Nakhon Sawan, Phitsanulok, Tha Chin river (Samut Sakhon), Ratchaburi, Rayong, Pathum Thani and Chumphon (Ref. 37773). Museum: Mekong basin, Menam Songkhram near Ban Paphaeng 10 km E of Si Songkhram, CAS 67191; Huay Nam Ngam & Mekong mainstream near That Phanom, CAS 96768 (Ref. 5515). Also Ref. 12693, 26663, 27732. 
Bagridae Mystus nigriceps (Valenciennes, 1840) Fr, Fi native  Pla kayeng moo (Thai), Kayeng mu (Thai), Pla kot (Thai), ปลากด (Thai), ปลาแขยงหมู (Thai)  30.00 cm TL male/unsexed  Found in Mekong River and its tributaries (Ref. 9648). Also found in Chiengmai (Chiang Mai), Menam (Chao Phraya); Krabi; Singora (Songkhla); and Chanthbun (Chanthaburi) River (Ref. 1632); also from Phetchaburi and Narathiwat (Ref. 37773). Known from southeast and peninsular Thailand (Ref. 57235). 
Bagridae Mystus pulcher (Chaudhuri, 1911) Fr native   8.00 cm NG male/unsexed  Reported from Surat Thani (Ref. 37773). 
Bagridae Mystus rhegma Fowler, 1935 Fr native   12.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281), Bangkok, Meklong basin, and Chao Phraya near Chainat (Ref. 10418); also from Phrae (Ref. 37773). Museum: Meklong at Ban Pong, UMMZ 186847. Chao Phraya basin, Pak Sakegang, CAS 81545. 
Bagridae Mystus singaringan (Bleeker, 1846) Fr, Or native   30.00 cm SL male/unsexed  Found in Mekong, Bangpakong, Chao Phraya, Meklong, Tapi, and Pattani basins (Ref. 10418). Also found in Peninsular and Southeast Thailand river systems (Ref. 26336). Museum: Mekong mainstream, CAS 79037, 92485 (Huay Nam Ngam near That Phanom); CAS 97031 (near Chiang Saen) (Ref. 5515). Also Ref. 26336, 27732, 57235. 
Bagridae Mystus velifer Ng, 2012 Fr native   14.48 cm SL male/unsexed  Found in the lower Mekong River drainage westwards and southwards to Songkhla Lake in Peninsula Thailand including the majority of river drainages debouching into the Gulf of Thailand such as the lower Bang Pakong, Chao Phraya, Mae Khlong and Tapi river drainages (Ref. 91083).  No picture yet.
Bagridae Mystus vittatus (Bloch, 1794) Fr, Fi, Or misidentification  Pla kayeng (Thai), Pla kayeng kang lai (Thai), Pla sai seng (Thai), Pla si seng (Thai), ปลาแขยง (Thai), ปลาแขยงข้างลาย (Thai), ปลาไสเซ้ง (Thai)  21.00 cm SL male/unsexed 9 NG Found in Mekong River and its tributaries (Ref. 9648); also from Phetchaburi, Bang Pakong river, (Chachoengsao), Chiang Mai, Lamphoon, Phitsanulok, Nakhon Sawan, Chai Nat, Suphan Buri, Uthai Thani, Nong Khai, Kalasin, Phra Nakhon Si Ayutthaya, Nakhon Ratchasima, Ubon Ratchathani, Kanchanaburi, Prachin Buri and Surat Thani (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Misidentification of M. atrifasciatus, multiradiatus, mysticetus (Ref. 26336). 
Bagridae Mystus wolffii (Bleeker, 1851) Fr native   20.00 cm TL male/unsexed  Known from Songkhla, Krabi, Bangkok, Phitsanulok, Chiang Mai, Phra Nakhon Si Ayutthaya and Ubon Ratchathani (Ref. 37773). Also Ref. 7050, 36654. 
Nandidae Nandus nandus (Hamilton, 1822) Fr, Br, Fi, Or native  Leaf fish (English)  20.00 cm TL male/unsexed  Known from Nakhon Sawan and Phra Nakhon Si Ayutthaya (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 4833, 41236. 
Nandidae Nandus nebulosus (Gray, 1835) Fr, Br native  Pla dum cee (Thai), Seua dum (Thai), ปลาดุมซี (Thai)  12.00 cm TL male/unsexed  Found in Mekong River and its tributaries (Ref. 9648) and Chao Praya (Ref. 31543). Known from peninsular Thailand to Borneo, including southeast Thailand (Ref. 57235); also from Chanthaburi, Phetchaburi, Nong Khai and Ubon Ratchathani (Ref. 37773). Also Ref. 36654. 
Nandidae Nandus oxyrhynchus Ng, Vidthayanon & Ng, 1996 Fr native   6.90 cm SL male/unsexed  Widely distributed throughout the Mekong, Maeklong and Chao Phraya basins (Ref. 31543). Also found in the river systems of Southeast Thailand (Ref. 26336). 
Bagridae Nanobagrus armatus (Vaillant, 1902) Fr native   3.20 cm SL male/unsexed  Reported from Pattani (Ref. 37773). 
Nemacheilidae Nemacheilus binotatus Smith, 1933 Fr native   6.00 cm TL male/unsexed  Known from the Chao Phraya, Maeklong (Ref. 78705), Mekong basins (Ref. 26336), Phrae, Phitsanulok and Kanchanaburi (Ref. 37773). Also Ref. 12041, 26580. 
Nemacheilidae Nemacheilus fasciatus (Valenciennes, 1846) Fr native   7.40 cm SL male/unsexed  Reported from Nakhon Si Thammarat (Ref. 37773). 
Nemacheilidae Nemacheilus longistriatus Kottelat, 1990 Fr native   12.50 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Found in the Mekong mainstream in Loei Province and in the Mae Kok in Chiang Mai Province (Ref. 39226). Museum: Mekong mainstream between Chiang Khan to 70 km downstream by road, CAS 62547, 62548, (Ref. 5515). Also Ref. 12693, 26336, 26580, 37773. 
Nemacheilidae Nemacheilus masyae Smith, 1933 Fr native   13.50 cm SL male/unsexed  Found in Peninsular Thailand, the Meklong, part of the Mae Nam Chao Phraya basins (Ref. 39226), Chiengmai (Chiang Mai); Me Poon; Kao Sabap and Pong Raet waterfall stream in Chanthaburi; Nakon Sritamarat (Nakhon Si Thammarat) (Ref. 1632); also reported from Phrae, Phitasanulok, Kanchanaburi, Sakon Nakhon, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 36133, 78705. 
Nemacheilidae Nemacheilus ornatus Kottelat, 1990 Fr native   4.10 cm SL male/unsexed  Known only from the type locality in the Tapi River basin (Ref. 39226). Type locality: Lake Sonkphan, Khlong Sok at Ban Khlong Sok, 8°49'N, 98°35'E, Tapi R. basin, Surat Thani Prov., Thailand (Ref. 33021). Occurs in Malay Peninsula (Ref. 26580). Also Ref. 37773. 
Nemacheilidae Nemacheilus pallidus Kottelat, 1990 Fr native   14.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya, Meklong basins (Ref. 26336, 27732) and Phrae (Ref. 37773). Collected in the Mekong basin at Nam Man about 2 km upstream of Amphoe Dan Sai in Loei Province (Ref. 39226). Also Ref. 12693, 26580. 
Nemacheilidae Nemacheilus platiceps Kottelat, 1990 Fr native   6.10 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732) and the Chao Phraya river (Ref. 78705). Also Ref. 43281. 
Nemacheilidae Nemacheilus selangoricus Duncker, 1904 Fr, Br, M native   5.90 cm SL male/unsexed  Occurs in Malay Peninsula; also reported from Trang and Songkhla (Ref. 37773).  No picture yet.
Nemacheilidae Nemacheilus troglocataractus Kottelat & Géry, 1989 Fr, Or, Thr endemic  Blind cave loach (English) scarce (very unlikely) 6.77 cm SL male/unsexed  Known from Tham Wang Badan (Ref. 42927) and the Mae Khlong basin (Ref. 26580). Type locality: Tham Sai Yok Noi [=Tham Nam Tok], 3 km north-northwest of Nam Tok, 14°15'N, 99°04'E, Kanchanaburi Province (Ref. 37842). Collected commercially on occasion for the aquarium trade (Ref. 42927). Threatened due to human disturbance and overfishing (Ref. 58784). Also Ref. 27299, 37773. Status of threat: Critically Endangered (Ref. 58784). 
Odontobutidae Neodontobutis aurarmus (Vidthayanon, 1995) Fr native   5.50 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 27732, 43281, 92840. 
Cyprinidae Neolissochilus dukai (Day, 1878) Fr, Br, M native    Reported from Nakhon Si Thammarat, Pattani, Tak and Mae Hong Son (Ref.37773).  No picture yet.
Cyprinidae Neolissochilus hexagonolepis (McClelland, 1839) Fr native   120 cm TL male/unsexed   
Cyprinidae Neolissochilus nigrovittatus (Boulenger, 1893) Fr native   13.00 cm TL male/unsexed  Reported from Tung Ying river (Tak) (Ref. 37773). 
Cyprinidae Neolissochilus paucisquamatus (Smith, 1945) Fr native    Known from Nakhon Si Thammarat (Ref. 37773). Also Ref. 4832. 
Cyprinidae Neolissochilus soro (Valenciennes, 1842) Fr native   100.00 cm TL male/unsexed  Known from Chanthaburi, Chiang Mai, Tak, Kanchanaburi and Surat Thani (Ref. 37773). Also Ref. 7050. 
Cyprinidae Neolissochilus soroides (Duncker, 1904) Fr native   45.00 cm TL male/unsexed   
Cyprinidae Neolissochilus stracheyi (Day, 1871) Fr, Fi native   60.00 cm SL male/unsexed  Known from Salween, Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Mae Hong Son (Ref. 37773). Also Ref. 1632, 4832, 9648, 12693, 43281. 
Cyprinidae Neolissochilus subterraneus Vidthayanon & Kottelat, 2003 Fr native   22.50 cm SL male/unsexed  Occurs throughout the main stream passage of Tham [=cave] Phra Wang Daeng in Thung Salaeng Luang National Park, Phitsanulok Province and has not been recorded yet outside of that cave (Ref. 51711). 
Cyprinidae Neolissochilus sumatranus (Weber & de Beaufort, 1916) Fr native   14.80 cm TL male/unsexed  Reported from Nakhon Si Thammarat, Trang, Kanchanaburi, Prachuap Khiri Khan, Chanthaburi and Mae Hong Son (Ref. 37773). 
Cyprinidae Neolissochilus vittatus (Smith, 1945) Fr native    Found in Salween basin (Ref. 12041) and Huey Mekong Kha, tributaries (Ref. 33021). Reported from Huey, Mae Klong Kha (Mae Hong Son) (Ref. 37773). 
Nemacheilidae Neonoemacheilus labeosus (Kottelat, 1982) Fr native   10.00 cm NG male/unsexed  Known from Mae Hong Son (Ref. 37773). Also Ref. 95537. In range Ref. 4832, 12041. 
Pomacentridae Neopomacentrus taeniurus (Bleeker, 1856) Fr, Br, M native   10.00 cm TL male/unsexed  Reported from Lem Sing (Chanthaburi), Phuket, Ko Samet and Ko Kuddi (Rayong) (Ref. 37773). 
Phallostethidae Neostethus bicornis Regan, 1916 Fr native   3.00 cm TL male/unsexed  Museum: near Tha Chalap on road to Chantaburi, Chantaburi Prov., MCZ 47304, 76856, 47305, 52364, 47306, 60081. Chumporn Prov., CAS 63196 (Ref. 12768). Also Ref. 7050. 
Phallostethidae Neostethus lankesteri Regan, 1916 Fr, Br native  Busai (Thai), บู่ใส (Thai)  3.00 cm SL male/unsexed  Museum: Chantabun River, USNM 102140 (holotype of N. siamensis, 2.87 cm SL, female). Near Tha Chalap on the road to Chantaburi, MCZ 76857. Satul Prov., MCZ 47200. Rayong Prov., CAS 63194. Chumporn Prov., CAS 63195 (Ref. 12768). Recorded from Petburi basin, West Thailand (Ref. 94697). Also Ref. 52823. 
Notopteridae Notopterus notopterus (Pallas, 1769) Fr, Fi native  Pla chalat (Thai), Pla cha lat (Thai), Pla cha-lad (Thai), Pla sa lat (Thai), Pla sa teo (Thai), Pla sa tue (Thai), Pla sa-lad (Thai), Pla salat (Thai), Pla tong (Thai), Pla tong na (Thai), ปลาฉลาด (Thai), ปลาตอง (Thai), ปลาตองนา (Thai), ปลาสตือ (Thai), ปลาสลาด (Thai)  60.00 cm SL male/unsexed 15 NG Known from Peninsular and Southeast Thailand, Salween, Maeklong, Chao Phraya and Mekong basins (Ref. 26336). Common in the Mekong mainstreams as well as its tributaries, living in pools with submerged wood and shrubs (Ref. 37770). Reported to move into tributaries during the flood season to spawn (Ref. 37770). The flesh has excellent flavour but has numerous tiny bones inside. Is commonly used to make fish balls and fish cake. Can also be processed by smoking (Ref. 6459). Museum: Mekong mainstream, CAS 97089 (near Chiang Khan); CAS 96646 (between Pak Ing and Jom Paeng, about 4-5 km downstream) (Ref. 5515). Also Ref. 1632, 4832, 7431, 37766, 37773, 43640, 43638, 57235. 
Siluridae Ompok eugeneiatus (Vaillant, 1893) Fr, Thr native  Malay glass catfish (English) scarce (very unlikely) 16.50 cm TL male/unsexed  Known from the Mekong, Chao Phraya and Peninsular Thailand river systems (Ref. 26336) and in peat areas (Ref. 57235); also fro Phra Nakhon Si Ayutthaya (Ref. 37773). Threatened due to habitat loss (Ref. 58784). Status of threat: Endangered (Ref. 58784).  No picture yet.
Siluridae Ompok fumidus Tan & Ng, 1996 Fr native   15.00 cm SL male/unsexed  Known from Toh Daeng Peat (Ref. 57235). Also Ref. 41243. 
Siluridae Ompok hypophthalmus (Bleeker, 1846) Fr native   30.00 cm SL male/unsexed  Known from the Mekong (Ref. 43281), Chao Phraya and Peninsular Thailand river systems (Ref. 26336). Recorded from Malay peninsula to Borneo (Ref. 57235); also from Phra Nakhon Si Ayutthaya, Nakhon Sawan, Pattani river, Pasak river (Sara Buri) and Phatthalung (Ref. 37773). Also Ref. 7050, 12693, 36654. 
Siluridae Ompok miostoma (Vaillant, 1902) Fr misidentification  Pla e-thub (Thai), Pla e-chok (Thai), Pla khao dum (Thai), Pla thuk (Thai), ปลาทุก (Thai), ปลาอีชุก (Thai), ปลาอีทุบ (Thai), ปลาเค้าดำ (Thai)  21.38 cm SL male/unsexed  Known from the Mekong River and its tributaries (Ref. 9648). Reported from Lop Buri, Ubon Ratchathani and Nong Khai (Ref. 37773). Reports from Thailand are misidentifications of Wallago leerii (Ref. 26336). 
Siluridae Ompok pinnatus Ng, 2003 Fr, Thr native  Long-fin glass catfish (English)  10.00 cm TL male/unsexed  Known from Chao Phraya basin. Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Endangered (Ref. 58784). 
Siluridae Ompok siluroides Lacepède, 1803 Fr, Fi native  Pla na san (Thai), Neua on (Thai), Pla cha oan (Thai), Pla i gun (Thai), Pla i tum (Thai), Pla nua on (Thai), Pla sa-yum porn (Thai), Sayum porn (Thai), ปลาชะโอน (Thai), ปลาสยุมพร (Thai), ปลาหน้าสั้น (Thai), ปลาอิกัน (Thai), ปลาอิตัม (Thai), ปลาเนื้ออ่อน (Thai)  21.44 cm SL male/unsexed  Reported from Trat (Ref. 37773). Also Ref. 1632, 4833, 9648, 41236. 
Siluridae Ompok urbaini (Fang & Chaux, 1949) Fr native   18.10 cm SL male/unsexed   
Salmonidae Oncorhynchus mykiss (Walbaum, 1792) Fr not established   122 cm TL male/unsexed  Introduced for experimental purposes in the highland development scheme in the northern part of the country (Ref. 6301). Also Ref. 1632, 58848. 
Salmonidae Oncorhynchus rhodurus Jordan & McGregor, 1925 Fr not established   44.20 cm TL male/unsexed    No picture yet.
Cyprinidae Onychostoma gerlachi (Peters, 1881) Fr native   31.64 cm SL male/unsexed  Occurs in the Chao Phraya and Mekong basins. 
Cyprinidae Onychostoma lini (Wu, 1939) Fr questionable   25.32 cm SL male/unsexed  Museum: Mekong river at Chiang Khan, CAS 63030 (Ref. 5515). Occurrence needs further confirmation. 
Synbranchidae Ophisternon bengalense McClelland, 1844 Fr, Br native   100.00 cm TL male/unsexed  Known from Nonthaburi (Ref. 37773). Also Ref. 7050, 4833. 
Danionidae Opsarius bernatziki (Koumans, 1937) Fr native   9.07 cm SL male/unsexed  Known from Nakhon Ratchasima, Kanchanaburi, Chiang Mai, Phrae and Nan. (Ref. 37773). Type locality: Kapa, nw. peninsular Thailand (Ref. 33021). In range Ref. 26580). Also Ref. 33021. 
Danionidae Opsarius infrafasciatus (Fowler, 1934) Fr native    Known from a stream flowing into Salween River, Maesamlab District, Maehongson Province (Ref. 93076). Also reported from Nakhon Ratchasima, Kanchanaburi, Phrae and Nan (Ref. 37773). Type locality: Metang R., 35 mi. north of Chiang Mai (Ref. 33021). 
Danionidae Opsarius koratensis (Smith, 1931) Fr native   16.00 cm TL male/unsexed  Known from the Chao Phraya and Mekong basins (Ref. 26336, 27732). Museum: Mekong river, CAS 63031, 96263 (Chiang Khan); CAS 96277 (at Bung Kla, ca. 140 km. nw of Nakhon Phanom); CAS 96262 (between Pak Ing and Jom Paeng, about 4-5 km downstream); CAS 96260 (4 km downriver from Pak Ing, ca. 25 km dowriver from Chiang Kong) (Ref. 5515); also from Nakhon Ratchasima, Kanchanaburi, Chiang Mai, Phrae and Nan (Ref. 37773). Also Ref. 9648, 12041, 12693, 26580, 36654, 37788, 43281. 
Danionidae Opsarius ornatus (Sauvage, 1883) Fr native    Known from Chao Phraya basin (Ref. 26580), Salween and Mekong basins (Ref. 26336). Also Ref. 37773. 
Danionidae Opsarius pulchellus (Smith, 1931) Fr native   11.00 cm SL male/unsexed  Known from the Chao Phraya and Mekong basins (Ref. 26336, 27732); also from Kanchanaburi, Uthai Thani, Tak, Mae Hong Son, Chiang Mai and Chiang Rai (Ref. 37773). Also Ref. 12041, 26580, 37788, 43281. 
Danionidae Opsarius signicaudus (Tejavej, 2012) Fr native   9.70 cm SL male/unsexed  Known from the Khwae Noi and Khwae Yai branches of the Maeklong River, western Thailand (Ref. 93076).  No picture yet.
Cyprinidae Oreichthys cosuatis (Hamilton, 1822) Fr native   8.00 cm TL male/unsexed  Found in Chao Phraya (Ref. 26580); also from Chanthaburi (Ref. 37773). Also Ref. 4832. 
Cyprinidae Oreichthys parvus Smith, 1933 Fr native   3.00 cm SL male/unsexed  Occurs in southeastern Thailand and the Mekong basin (Ref. 43281). Firstly reported from the peat canals in Toh Daeng Peat (Ref. 57235). Also Ref. 27732. 
Cichlidae Oreochromis aureus (Steindachner, 1864) Fr, Br, Fi introduced   45.70 cm TL male/unsexed  Also Ref. 58915. 
Cichlidae Oreochromis mossambicus (Peters, 1852) Fr, Br, Fi, Aq introduced   39.00 cm SL male/unsexed  Also Ref. 3, 7306, 26920, 52307, 58915. 
Cichlidae Oreochromis niloticus (Linnaeus, 1758) Fr, Br, Fi, Aq introduced  Pla nil (Thai), ปลานิล (Thai)  60.00 cm SL male/unsexed  Occurs in the Mekong along the Thai-Lao border (Ref. 12693). Valued for its good flavor. Sometimes processed into dry, salted fish (Ref. 6459). Also Ref. 9987, 10974 and 12228. 
Sisoridae Oreoglanis colurus Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   6.18 cm SL male/unsexed  Known only from the type locality in the upper reaches of the Nan River drainage, itself a tributary of the Chao Phraya River in northern Thailand (Ref. 83406). 
Sisoridae Oreoglanis heteropogon Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   6.99 cm SL male/unsexed  Known only from the Salween River drainage in western Thailand (Ref. 83406). 
Sisoridae Oreoglanis laciniosa Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   6.99 cm SL male/unsexed  Found in the Mae Sa Nga drainage, a tributary of the Salween River in western Thailand (Ref. 83406). 
Sisoridae Oreoglanis nakasathiani Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   11.93 cm SL male/unsexed  Found in the upper reaches of the Ping River drainage, itself a tributary of the Chao Phraya River in northern Thailand (Ref. 83406). 
Sisoridae Oreoglanis siamensis Smith, 1933 Fr, Pr, Thr native  Siamese bat catfish (English), Pla khae (Thai), Pla tid hin (Thai), ปลาติดหิน (Thai), ปลาแค้ (Thai)  14.00 cm SL male/unsexed  Found in Mekang (Meping River tributary) and Melao (Meleng River tributary) Rivers, where it is protected (Ref. 12217). Occurs in the Chao Phraya basin (Ref. 12693); also from Chiang Mai (Ref. 37773). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 1632, 2073. Status of threat: Endangered (Ref. 58784). 
Sisoridae Oreoglanis sudarai Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   11.31 cm SL male/unsexed  Found only in the upper reaches of the Ping River drainage, itself a tributary of the Chao Phraya River in northern Thailand (Ref. 83406). 
Sisoridae Oreoglanis suraswadii Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   7.33 cm SL male/unsexed  Found only in the Nam Ruak River drainage, a western tributary of the Mekong River in northern Thailand (Ref. 83406). 
Sisoridae Oreoglanis tenuicauda Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   9.02 cm SL male/unsexed  Found only in the type locality in the upper reaches of the Nan River drainage, itself a tributary of the Chao Phraya River in northern Thailand (Ref. 83406). 
Sisoridae Oreoglanis vicina Vidthayanon, Saenjundaeng & Ng, 2009 Fr native   8.11 cm SL male/unsexed  Found in the upper reaches of the Nan River drainage, itself a tributary of the Chao Phraya River in northern Thailand (Ref. 83406). 
Adrianichthyidae Oryzias javanicus (Bleeker, 1854) Fr, Br native  Siokhaosanjava (Thai), ซิวข้าวสารชวา (Thai)  4.50 cm TL male/unsexed  Known from Phuket (Ref. 37773). Also Ref. 27658, 52823. 
Adrianichthyidae Oryzias mekongensis Uwa & Magtoon, 1986 Fr native   3.00 cm TL male/unsexed  Found in the Mekong basin. Also from Kalasin, Si Sa Ket, Surin, Nakhon Rachasima, Roi Et and Mun river (Ref. 37773). Also Ref. 27139, 26336. 
Adrianichthyidae Oryzias minutillus Smith, 1945 Fr native  common (usually seen) 2.00 cm TL male/unsexed  Occurs in Chao Phraya and Bang Nara basins (Ref. 1632), Mekong and Peninsular Thailand river systems (Ref. 26336); and peats (Ref. 57235). Reported from Bangkok and Satul (Ref. 31267); Samut Prakan, Pathum Thani, Nonthaburi, Ang Thong, Suphan Buri, Phra Nakhon Si Ayutthaya, Chiang Mai, Nakhon Si Thammarat, Phuket (Ref. 37773). Also Ref. 12041, 27139, 27658. 
Adrianichthyidae Oryzias sinensis Chen, Uwa & Chu, 1989 Fr native   3.10 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Adrianichthyidae Oryzias songkhramensis Magtoon, 2010 Fr native   1.90 cm SL male/unsexed  Type locality, Ban Nong Phai, Ratanawapi, Nong Khai Province, KUMF 7021 (holotype of Oryzias songkhramensis, 1.67 cm SL) (Ref. 84389).  No picture yet.
Osphronemidae Osphronemus exodon Roberts, 1994 Fr native   60.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 27732. 
Osphronemidae Osphronemus goramy Lacepède, 1801 Fr, Fi, Ex native  Pla min (Thai), Pla raed (Thai), Pla rat (Thai), ปลามิน (Thai), ปลาแรด (Thai)  70.00 cm SL male/unsexed  Found in Mekong, Chao Phraya, Maeklong and Peninsular Thailand river systems (Ref. 26336). Its flesh has good flavour. Is one of the species cultured by the Fisheries Department (Ref. 6459); also from Phatthalung, Hang-kaben (Phra Nakhon Si Ayutthaya), Tapi river (Surat Thani), Kanchanaburi, Mekong river and Songkhla (Ref. 37773). Also Ref. 7425, 9648, 37772, 37773, 43638. 
Cyprinidae Osteobrama alfredianus (Valenciennes, 1844) Fr native    Reported from Mae Hong Son (Ref. 37773).  No picture yet.
Cyprinidae Osteochilus enneaporos (Bleeker, 1852) Fr native   23.00 cm SL male/unsexed  Reported from Trang, Pattani and Surat Thani (Ref. 37773). 
Cyprinidae Osteochilus kahajanensis (Bleeker, 1856) Fr native   22.00 cm SL male/unsexed   
Cyprinidae Osteochilus lini Fowler, 1935 Fr native   15.00 cm SL male/unsexed  Found in the Chao Phraya, Mekong and Southeast Thailand river systems (Ref. 26336); also from Khon Kaen, Sakon Nakhon, Nong Khai, Nakhon Nayok, Chanthaburi and Trat (Ref. 37773). Also Ref. 1632, 12041, 12693, 26580, 27732, 43281. 
Cyprinidae Osteochilus melanopleura (Bleeker, 1852) Fr, Br, M, Fi native  Pla soi nok khao (Thai), Pla nok khao (Thai), Pla prom (Thai), Pla prom hua men (Thai), ปลานกเขา (Thai), ปลาพรม (Thai), ปลาพรมหัวเหม็น (Thai), ปลาสร้อยนกเขา (Thai)  60.00 cm SL male/unsexed  Found in Tapi R., Meklong R., Menam Mun, Chao Phraya, Meyom at Lampang as well as in Mekong River and its tributaries (Ref. 9648); also from Surat Thani, Bangkok, Nonthaburi, Khon Kaen, Ratchaburi, Ang Thong, Nakhon Ratchasima, Phra Nakhon Si Ayutthaya, Nakhon Sawan and Songkhla (Ref. 37773). Museum: Huay Nam Ngam & Mekong mainstream near That Phanom, CAS 95525 (Ref. 5515). Also Ref. 2091, 26336, 26580, 27732, 36654, 37772, 43281. 
Cyprinidae Osteochilus microcephalus (Valenciennes, 1842) Fr native   24.00 cm SL male/unsexed  Known from Salween, Maeklong, Chao Phraya, Mekong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chai Nat, Kanchanaburi, Surat Thani, Chiang Mai, Kemarat (Ubon Ratchathani), Kamphaeng, Phet, Phra Nakhon Si Ayutthaya, Nong Khai, Nakhon Sawan, Chanthaburi, Pattani, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 7050, 26580, 36654, 43281, 57235. 
Cyprinidae Osteochilus scapularis Fowler, 1939 Fr native   18.44 cm SL male/unsexed  Known from Malay Peninsula from Trang southwards (Ref. 81211).  No picture yet.
Cyprinidae Osteochilus schlegelii (Bleeker, 1851) Fr, Thr native  Giant sharkminnow (English), Pla sa (Thai), Soi (Thai), ปลาซ่า (Thai)  40.00 cm SL male/unsexed  Occurs in the lower Chao Phrya and Meklong River (Ref. 2091) and the Mekong River and its tributaries (Ref. 9648); also from Bangkok, Ang Thong, Phra Nakhon Si Ayutthaya, Khon Kaen, Nong Khai and Chanthaburi (Ref. 37773). Threatened due to habitat loss (Ref. 58784). Also Ref. 7050, 26580, 36654. Status of threat: Critically Endangered (Ref. 58784). 
Cyprinidae Osteochilus spilurus (Bleeker, 1851) Fr native   10.20 cm SL male/unsexed  Known from Toh Daeng Peat swamp (Ref. 57235). 
Cyprinidae Osteochilus vittatus (Valenciennes, 1842) Fr, Fi native  Pla sa (Thai), Pla i gun tu bo (Thai), Pla khe khom (Thai), Pla khi khom (Thai), Pla nok khao (Thai), Pla prom hua men (Thai), Pla soi nok khao (Thai), ปลาขี้ขม (Thai), ปลาซ่า (Thai), ปลานกเขา (Thai), ปลาพรมหัวเหม็น (Thai), ปลาสร้อยนกเขา (Thai), ปลาอิกันตูโบ (Thai)  32.00 cm SL male/unsexed  Found in the northeast reservoirs; Mekong River and its tributaries (Ref. 9648) and in the Chao Phraya (Ref. 27732), Salween, Maeklong, peninsular and southeast Thailand river systems (Ref. 26336). Reported from Phrae, Yala, Phitsanulok, Nakhon Phanom, Chiang Mai, Nonthaburi, Phra Nakhon Si Ayutthaya, Chanthaburi, Chai Nat, Nakhon Sawan, Khon Kaen, Ubon Ratchathani, Surat Thani, Kanchanaburi, Nakhon Ratchasima, Songkhla, Prachin Buri, Narathiwat, Kamphaeng, Phet and Nong Khai, (Ref. 37773). Preferably eaten fresh or processed into sour fish, fermented fish or smoked fish (Ref. 6459). Also Ref. 1632, 2686, 4832, 26580, 27732, 43281, 57235. 
Cyprinidae Osteochilus waandersii (Bleeker, 1853) Fr native   27.60 cm TL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732). Recorded from Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Trang, Chiang Rai, Surat Thani, Chanthaburi, Kanchanaburi, Chumphon, Trat, Yala, Prachuap Khiri Khan and Phrae (Ref. 37773). Also Ref. 7050, 36654, 43281. 
Mugilidae Osteomugil speigleri (Bleeker, 1858) Fr, Br, M native   35.00 cm TL male/unsexed  Reported from Krabi, Klong Wan (Prachuap Khiri Khan) and Trat river (Ref. 37773). 
Apogonidae Ostorhinchus cookii (Macleay, 1881) Fr native   10.00 cm TL male/unsexed  Reported from Paknam (Samut Prakan) and Bangkok (Ref. 37773). 
Oxudercidae Oxuderces dentatus Eydoux & Souleyet, 1850 Fr native   10.00 cm TL male/unsexed  Reported from Paknam (Samut Prakan) (Ref. 37773). Also Ref. 4833. 
Butidae Oxyeleotris marmorata (Bleeker, 1852) Fr, Br, Fi, Aq native  Pla bu sai (Thai), Pla boo jak (Thai), Pla boo sai (Thai), Pla bu (Thai), Pla bu jak (Thai), Prabu (Thai), ปลาบู่จาก (Thai), ปลาบู่ทราย (Thai)  65.00 cm SL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336). Reported from Bangkok, Nonthaburi, Phra Nakhon Si Ayutthaya, Lop Buri, Tha Chin river (Samut Sakhon), Paknampho (Nakhon Sawan), Songkhla, Klong Dan (Samut Prakan), Chachoengsao, Uttaradit, and Surat Thani (Ref. 37773). Also Ref. 3178, 6459, 7306, 36654, 43281, 57235. 
Butidae Oxyeleotris urophthalmus (Bleeker, 1851) Fr native   28.00 cm TL male/unsexed  Known from Tha Chin river (Samut Sakhon) and Nakhon Pathom (Ref. 37773). Also Ref. 7050. 
Xenocyprididae Oxygaster anomalura Van Hasselt, 1823 Fr native   20.00 cm SL male/unsexed  Occurs in Chanthaburi, Songkhla and Mekong River (Ref. 37773). Reported from the river systems of Maeklong, Peninsular Thailand and Southeast Thailand (Ref. 26336). Also Ref. 7050, 12693, 57235. 
Xenocyprididae Oxygaster pointoni (Fowler, 1934) Fr native   15.50 cm SL male/unsexed  Occurs in the Chao Phraya and Mekong basins (Ref. 26336, 27732); also from Chiang Mai and Nong Khai (Ref. 37773). Also Ref. 43281. 
Pangasiidae Pangasianodon gigas Chevey, 1931 Fr, Fi, Ex, Thr native  Mekong giant catfish (English), Pla ma fai (Thai), Buk (Thai), Pla buk (Thai), Pla hua kum hang hum (Thai), Pla nang (Thai), ปลาปึก (Thai) occasional (usually not seen) 300 cm TL male/unsexed ;235 cm SL female  Occurs in Ubon Ratchathani and Chiang Rai (Ref. 37773). Artificially reproduced fry from artificial breeding program by Department of Fisheries since the 1980s released in the Mekong, the Chao Phraya and natural waters in Thailand (Ref. 7432). Stocked in various reservoirs. Offspring attains a very quick growth, but unsuccesful to develop reproducing gonads in aquaculture condition (Ref. 43281). Highly priced food fish (Ref. 6459). Locally rare in the markets, but popular in pond culture. Threatened due to overfishing (Ref. 58784). Also Ref. 9448, 9648, 26336. Status of threat: Critically Endangered (Ref. 58784). 
Pangasiidae Pangasianodon hypophthalmus (Sauvage, 1878) Fr, Fi, Aq native  Pla sawai (Thai), Stripe catfish (English) scarce (very unlikely) 130 cm SL male/unsexed  Known from the Mekong, Chao Phraya and Maeklong basins (Ref. 26336). Reported from Bangkok (Ref. 1632), Tha Chin river, Pa Sak river (Sara Buri), Nakhon Sawan, and Phra Nakhon Si Ayutthaya (Ref. 37773). Migrates upstream from Sungkom District (Nong Khai Province) to Chiang Khong from May to July (Ref. 37770); most abundant at the central part. Found in large numbers in the upper part of the Ping River. Can be cultured both in ponds and in cages (Ref. 6459). One of the most important aquaculture species where naturaly occurring P. hypophthalmus are evidently extremely rare. Cultured fish (pla sawai in Thai) attain a maximum size of about 7 kg, while wild ones (called pla sooai in Issan) reportedly attain 50 kg (Ref. 9497). Also Ref. 7432, 37772, 37773. 
Pangasiidae Pangasius bocourti Sauvage, 1880 Fr native   120 cm SL male/unsexed  Found in the Mekong and Chao Phraya basins (Ref. 7432, 26336); also from Tonle Sap (Ref. 37773). Also Ref. 1632, 37770, 41485. 
Pangasiidae Pangasius conchophilus Roberts & Vidthayanon, 1991 Fr, Fi, Ft native   120 cm SL male/unsexed  Large, fast growing species. Most important in the markets of the Chao Phraya and Mekong in Thailand. Might be valuable in mixed culture with P. hypophthalmus in ponds populated by molluscs (Ref. 7432). Migrates upstream from March to August from the Khong Island, just upstream Khone Falls in Laos to Chiang Saen in Thailand (Ref. 37770). Juveniles of 4 cm appear at Klong Kaem District, Ubolratchatani Province and at That Phanom District, Nakhon Phanom Province (Ref. 37770). Museum: Mekong river at Bung Kla, 140 km nw of Nakhon Phanom, CAS 67216 (Ref. 5515). Also Ref. 26336, 37770, 41485. 
Pangasiidae Pangasius djambal Bleeker, 1846 Fr native   90.00 cm TL male/unsexed  Found in the Mun River of the middle Mekong in northeast Thailand. Migrates upstream from May, when the water level rises, until August (Ref. 37770). Undertakes downstream migration in Loei during October-November (Ref. 37770). Small juveniles (2-4 cm) have been encountered at Nakhon Phanom from May to November (Ref. 37770). 
Pangasiidae Pangasius elongatus Pouyaud, Gustiano & Teugels, 2002 Fr native   28.20 cm SL male/unsexed  Known from the lower reaches of the Chao Phraya and from the Bangpakong but not from the Mekong or other rivers (Ref. 7432). Also observed in Siam Gulf (? = Gulf of Thailand). Mature specimens observed from July to August in Chao Phraya. Considered close to extinction in Thailand (Ref. 46915). Also Ref. 43281.  No picture yet.
Pangasiidae Pangasius krempfi Fang & Chaux, 1949 Fr native   120 cm SL male/unsexed  Known from the Mekong basin. Upstream the Khone Falls, it migrates upstream from May to September, dominated by fish in spawning condition (Ref. 37770). Above the Khone Falls, dowstream migration takes place in October (Ref. 37770). Migrations above the Khone Falls in Thailand are triggered by the increase of the water levels (Ref. 37770). Also Ref. 7432, 12693. 
Pangasiidae Pangasius larnaudii Bocourt, 1866 Fr, Fi, Ft native  Pla the pho (Thai), Pla chai por (Thai), Pla hou mat (Thai), Sang kaward (Thai), Tepo (Thai), ปลาเทโพ (Thai), ปลาแชปอ (Thai)  130 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732) and Maeklong basin (Ref. 26336). Reported from Phra Nakhon Si Ayutthaya, Chai Nat, Ubon Ratchathani, and Nong Khai (Ref. 37773). Not found in the markets of Bangkok a century ago because it was expensive and reserved for consumption by important people; it was raised in water courses closed off by bamboo grill (Ref. 7432). Also Ref 1632, 6459, 9648, 41485. 
Pangasiidae Pangasius macronema Bleeker, 1850 Fr native  Pla ai duang (Thai), Pla ai dung (Thai), Pla sang ka ward (Thai), Pla sang ka wart (Thai), Sangaward leung (Thai), ปลาสังกะวาด (Thai), ปลาอ้ายด้วง (Thai)  30.00 cm SL male/unsexed  Found in Mekong and Chao Phraya basins (Ref. 26336); also from Nakhon Sawan, Kemarat (Ubon Ratchathani), Lop Buri river, Pa Sak river (Sara Buri) (Ref. 37773). Museum: Mekong river at Bung Kla (140 km N of Nakhon Phanom), CAS 67208 (Ref. 5515). Fishers in Loei Province reported that this species migrates downstream in October-November (Ref. 37770). Also Ref. 9648, 37773. 
Pangasiidae Pangasius nasutus (Bleeker, 1863) Fr native   90.00 cm TL male/unsexed  Reported from Nakhon Sawan, Ang Thong, Samut Prakan, Chai Nat, Phra Nakhon Si Ayutthaya and Nong Khai (Ref. 37773). 
Pangasiidae Pangasius pangasius (Hamilton, 1822) Fr, Fi, Aq misidentification  Pla sa wai kluay (Thai), Pla ai duang (Thai), Pla ai dung (Thai), Pla sa wai (Thai), Pla sang ka ward (Thai), Pla sang ka ward khao (Thai), Pla sang ka ward kluay (Thai), Pla sang ka wart (Thai), Pla sang ka wart khaow (Thai), Pla sang ka wart kluay (Thai), ปลาสวาย (Thai), ปลาสวายกล้วย (Thai), ปลาสังกะวาด (Thai), ปลาสังกะวาดกล้วย (Thai), ปลาสังกะวาดขาว (Thai), ปลาอ้ายด้วง (Thai)  300 cm SL male/unsexed  Report of this species in this region is based on a misidentification of Pangasius hypophthalmus. 
Pangasiidae Pangasius polyuranodon Bleeker, 1852 Fr native   80.00 cm SL male/unsexed  Reported from Bang Pakong river (Chachoengsao), Nonthaburi and Samut Prakan (Ref. 37773). 
Pangasiidae Pangasius sanitwongsei Smith, 1931 Fr, Aq, Or, Sp, Thr native  Chao Phraya giant catfish (English), Pla the pha (Thai), Pla tepa (Thai), Pla the pa (Thai), Tepa (Thai), ปลาเทพา (Thai)  300 cm SL male/unsexed  Known from Mekong and Chao Phraya basins (Ref. 26336). Reported from Phra Nakhon Si Ayutthaya, Nong Khai, Nakhon Ratchasima, Chiang Mai, Ubon Ratchathani, and Lop Buri river (Ref. 37773). Threatened due to habitat loss and overfishing; extirpated in the Chao Phraya (Ref. 58784). Museum: Mekong river, CAS 67212 (Bungkla, 140 km nw of Nakhon Phanom); CAS 67213 (mainstream at Bung Kan) (Ref. 5515). Also Ref. 1632, 9648, 37773, 45563. Status of threat: Endangered (Ref. 58784). 
Cobitidae Pangio anguillaris (Vaillant, 1902) Fr native  Pla ard (Thai), ปลาอาด (Thai)  12.00 cm SL male/unsexed  Occurs in Mekong River and its tributaries (Ref. 9648) and Chao Phraya basin (Ref. 13770); also from Phrae, Khon Kaen, Phitsanulok, Chiang Mai, Nakhon Sawan, Chanthaburi, Kanchanaburi, Nakhon Ratchasima, Sakon Nakhon and Surat Thani (Ref. 37773). Also Ref. 7050, 36654, 26580, 57235. 
Cobitidae Pangio cuneovirgata (Raut, 1957) Fr native   6.00 cm SL male/unsexed  Known from Narathiwat. Uncommon from peats of South Thailand to Sumatra (Ref. 57235). Also Ref. 13770. 
Cobitidae Pangio doriae (Perugia, 1892) Fr native   9.00 cm TL male/unsexed  Known from Malay peninsula to Borneo (Ref. 57235). 
Cobitidae Pangio fusca (Blyth, 1860) Fr native   8.00 cm SL male/unsexed  Occurs in the Salween (Ref. 27732), Maeklong, Chao Phraya, Mekong and Peninsular Thailand river systems (Ref. 26336). 
Cobitidae Pangio kuhlii (Valenciennes, 1846) Fr, Or native   12.00 cm TL male/unsexed  Known from Chanthaburi and Chonburi (Ref. 37773). Also Ref. 13770, 57235. 
Cobitidae Pangio myersi (Harry, 1949) Fr, Or native   10.00 cm SL male/unsexed  Known from southeastern Thailand (Ref. 13770) and Malay Peninsula (Ref. 26580); also from Chanthaburi and Chonburi (Ref. 37773). Also Ref. 43281. 
Cobitidae Pangio oblonga (Valenciennes, 1846) Fr native   8.00 cm TL male/unsexed  Known from th Chao Phraya basin (Ref. 26580) and Mekong basin (Ref. 43281). Reported from Phrae, Khon Kaen, Phatthalung, Kanchanaburi, and Surat Thani (Ref. 37773). Found in torrent streams with gravel or densely litter bottoms including peat canals (Ref. 57235). Also Ref. 7050. 
Cobitidae Pangio pangia (Hamilton, 1822) Fr questionable   6.50 cm TL male/unsexed  Reported from Narathiwat and Sukhothai (Ref. 37773). Outside distributional range, occurrence needs further confirmation. 
Tetraodontidae Pao abei (Roberts, 1998) Fr native  scarce (very unlikely) 10.30 cm SL male/unsexed  Found in the Mekong and Meklong basins (Ref. 27661, 43281); also in the Mae Nam Nan (Ref. 43281) and Chao Phraya (Ref. 27661) basins. 
Tetraodontidae Pao baileyi (Sontirat, 1985) Fr, Thr native  Hairy puffer (English)  12.00 cm SL male/unsexed  Found in the Mekong River (Ref. 27661). Threatened due to habitat loss (Ref. 58784). Museum: Mekong mainstream near Chiang Khan, CAS 79106 (Ref. 5515). Also Ref. 26336, 27661, 43281, 94476. Status of threat: Endangered (Ref. 58784). 
Tetraodontidae Pao brevirostris (Benl, 1957) Fr native   9.46 cm SL male/unsexed ;7.72 cm SL female  Type locality, Mekong basin Nongkomkoh Swamp, Amphoe Mueang, Nong Khai Province, KUMF 8834 (holotype of Tetraodon palustri, 7.21 cm SL) (Ref. 93844).  No picture yet.
Tetraodontidae Pao cambodgiensis (Chabanaud, 1923) Fr native   15.30 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Tetraodontidae Pao cochinchinensis (Steindachner, 1866) Fr native   11.28 cm SL male/unsexed  Occurs in the river systems of peninsular and southeast Thailand (Ref. 26336). Occurs in the Mekong and the Chao Phraya basins (Ref. 43281); also from Surat Thani (Ref. 37773). 
Tetraodontidae Pao leiurus (Bleeker, 1850) Fr native  Pla pak pao jud (Thai), Pla pak pao dum (Thai), ปลาปักเป้าจุด (Thai), ปลาปักเป้าดำ (Thai)  16.00 cm male/unsexed  Found in Mekong, Bangpakong, Chao Phraya, Meklong, Tapi, Saiburi and Pattani basins and in Songkhla Lake (Ref. 27661). Museum: Mekong mainstream, CAS 79117 (near Chiang Khan); CAS 79123 (Huay Nam Ngam, 1 km downriver from That Phanom) (Ref. 5515); also from Nonthaburi, Chiang Mai, Phitsanulok, Tale Sap Songkhla, Hangkaben (Phra Nakhon Si Ayutthaya), Nong Khai,Khon Kaen, Kalasin, Pattani, Yala, Ubon Ratchathani, Kanchanaburi and Nakhon Sawan (Ref. 37773). Also Ref. 9648, 12693, 37773. In range Ref. 7050. 
Tetraodontidae Pao ocellaris (Klausewitz, 1957) Fr native    Type locality, area of Pattalung in southern Thailand (Ref. 81211). Also Ref. 94476.  No picture yet.
Tetraodontidae Pao palembangensis (Bleeker, 1851) Fr native   19.40 cm SL male/unsexed  Restricted to peat habitats in peninsular Thailand (Ref. 57235). Known from the Mekong, Chao Phrya, Tale Luang, Tale Noi and Tale Sap (Ref. 2091); also from Nonthaburi and upper Bang Pakong river (Ref. 37773). 
Tetraodontidae Pao suvattii (Sontirat & Soonthornsatit, 1985) Fr native   11.50 cm SL male/unsexed  Known from the Mekong River (Ref. 27661). Museum: Mekong mainstream near Chiang Khan, CAS 79134, 79136 (Ref. 5515). Also Ref. 26336, 27732, 43281, 94476. 
Tetraodontidae Pao turgidus (Kottelat, 2000) Fr native   18.50 cm SL male/unsexed  Occurs in the Mekong basin and possibly also in the Chao Phraya basin (Ref. 36949, 43281). 
Gobiidae Papuligobius ocellatus (Fowler, 1937) Fr native   12.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 27732, 43281. 
Nemacheilidae Paracanthocobitis maekhlongensis Singer & Page, 2015 Fr native  Maekhlong zipper loach (English)  7.50 cm SL male/unsexed  Known from the Mae Khlong River basin, Kanchanaburi Province (Ref. 102002).  No picture yet.
Nemacheilidae Paracanthocobitis mandalayensis (Rendahl, 1948) Fr native   8.84 cm SL male/unsexed  Known from the Wang and Ping rivers, Chao Phraya River basin in northwestern Thailand (Ref. 102002).  No picture yet.
Nemacheilidae Paracanthocobitis nigrolineata Singer, Pfeiffer & Page, 2017 Fr native  Blacklined zipper loach (English)  4.24 cm SL female  Known from Mae Khlong drainage (Ref. 117351).  No picture yet.
Nemacheilidae Paracanthocobitis phuketensis (Klausewitz, 1957) Fr native   3.33 cm SL female  Known from the Phuket Island and Panang Tak drainage in Peninsular Thailand (Ref. 117351).  No picture yet.
Nemacheilidae Paracanthocobitis zonalternans (Blyth, 1860) Fr native   12.20 cm TL male/unsexed  Known from the Salween River drainage (Ref. 117351). Reported from the Mae Khlong; (Ref. 39226); Mae Hong Son, Kanchanaburi, and Surat Thani (Ref. 37773). Also Ref. 12041, 26580, 78705. 
Xenocyprididae Parachela maculicauda (Smith, 1934) Fr native   6.00 cm TL male/unsexed  Known from Maeklong, Peninsular Thailand, Southeast Thailand, Chao Phraya and Mekong river systems. Also recorded from Chanthaburi, Kanchanaburi, Khon Kaen, Songkhla, Chachoengsao, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 12041, 36654, 43281, 57235. 
Xenocyprididae Parachela oxygastroides (Bleeker, 1852) Fr, Fi native  Pla paep (Thai), Paep khao (Thai), Pla paep khao (Thai), Pla siew (Thai), Pla thong plu (Thai), Pla tong plu (Thai), ปลาซิว (Thai), ปลาท้องพลุ (Thai), ปลาแปบ (Thai), ปลาแปบขาว (Thai)  20.00 cm SL male/unsexed  Occurs in Maenam Nan, Paknampho; Me Poon; Bangkok; Bangpakong River; Krabi; Thale Sap, inner lake; Maeklong River at Rachaburi; Nakhon Sritamarat (Nakhon Si Thammarat) (Ref. 1632) and Chao Phraya River (Ref. 26336). Known from Malay to peninsular Thailand (Ref. 57235); also from Phitsanulok, Nakhon Sawan, Phra Nakhon Si Ayutthaya, Chachoengsao, Songkhla, Nakhon Si Thammarat, Mekong river, Phrae and Kanchanaburi (Ref. 37773). Also Ref. 2686, 26580, 36654. 
Xenocyprididae Parachela siamensis (Günther, 1868) Fr native   19.00 cm TL male/unsexed  Known from the river systems of Southeast Thailand, Mekong and Chao Phraya (Ref. 26336); also from Phra Nakhon Si Ayutthaya, Phetchabun and Phrae (Ref. 37773). Also Ref. 12041, 12693, 26580, 27732, 36654, 43281, 57235. 
Xenocyprididae Parachela williaminae Fowler, 1934 Fr native  occasional (usually not seen) 12.00 cm SL male/unsexed  Known from the Mekong and Chao Phraya basins (Ref. 26336). Found in Chieng Sen (Ref. 33021); also from Chiang Rai (Ref. 37773). Also Ref. 27732, 43281. 
Akysidae Parakysis verrucosus Herre, 1940 Fr native   5.00 cm SL male/unsexed  Recently very rare, one of threatened fish due to habitat losses in Thailand. More common in Malaysia (Ref. 57235); also from Narathiwat (Ref. 37773). 
Xenocyprididae Paralaubuca barroni (Fowler, 1934) Fr native  Pla paep (Thai), ปลาแปบ (Thai)  15.00 cm SL male/unsexed  Occurs in the Maeklong and Chao Phraya (Ref. 26336), Mekong (Ref. 27732) and at Chieng Sen (Ref. 33021). Museum: Mekong river at Chiang Khan, CAS 63043 (Ref. 5515); also from Nakhon Ratchasima, Phitsanulok, Chiang Rai, Kanchanaburi and Surat Thani (Ref. 37773). Also Ref. 9648, 43281. 
Xenocyprididae Paralaubuca harmandi Sauvage, 1883 Fr native   21.90 cm SL male/unsexed  Found in the Chao Phraya and Mekong basins (Ref. 26336). Collected from the main river Mekong in Chiang Rai and Nong Khai Province (Ref. 37786); also from Moon river, Ubon Ratchathani and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 12041, 26580, 43281. 
Xenocyprididae Paralaubuca riveroi (Fowler, 1935) Fr native   18.00 cm SL male/unsexed  Known from Maeklong, Peninsular Thailand, Chao Phraya and Mekong river systems. Also recorded from Phitsanulok, Nakhon Sawan, Chiang Mai, Chiang Rai, Khon Kaen, Ubon Ratchathani, Nong Khai, Kanchanaburi and Surat Thani (Ref. 37773). Also Ref. 9648, 26580, 43281. 
Xenocyprididae Paralaubuca stigmabrachium (Fowler, 1934) Fr native    Known from the Chao Phraya basins (Ref. 26580). Type locality: Mekong R. at Chieng Sen, n. Thailand (Ref. 33021); also from Kanchanaburi, Phitsanulok, Chiang Rai and Nong Khai (Ref. 37773).  No picture yet.
Xenocyprididae Paralaubuca typus Bleeker, 1864 Fr native   18.00 cm SL male/unsexed  Known from the Maeklong, Peninsular Thailand, Chao Phraya and Mekong river systems (Ref. 26336). At Loei and Chiang Khong of the Mekong basin, this species occcurs throughout the year, migrating up into tributaries (e.g. Loei River ) and into flooded areas at both places (Ref. 37770); also from Nonthaburi, Suphan Buri, Samut Songkhram and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 12041, 27732, 36654, 43281. 
Ambassidae Parambassis baculis (Hamilton, 1822) Fr native   7.00 cm TL male/unsexed  Known from Central Thailand, Klong Borapet (Nakhon Sawan), Pattani river, Nan river and Sikuk river (Phra Nakhon Si Ayutthaya ) (Ref. 37773). Also Ref. 41236. 
Ambassidae Parambassis dayi (Bleeker, 1874) Fr questionable   17.50 cm TL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan) (Ref. 37773). Outside distributional range, occurrence needs further verification.  No picture yet.
Ambassidae Parambassis ranga (Hamilton, 1822) Fr, Br native   9.50 cm TL male/unsexed  Known from Pai river (Mae Hong Son) and Songkhla (Ref. 37773). Museum: Salween R. mainstream near Mae Sam Leap, CAS 79079-80. Also Ref. 4833, 41236, 43640. 
Ambassidae Parambassis siamensis (Fowler, 1937) Fr native  Pla kao mao (Thai), Pla pan (Thai), ปลาข้าวเม่า (Thai), ปลาแป้น (Thai)  7.50 cm SL male/unsexed  Occurs in Mekong, Chantaburi, Bangpakong, Chao Phraya, Meklong, Tapi, and Pattani river basins (Ref. 10429). Found in the river systems of Peninsular and Southeast Thailand (Ref. 26336); also from Bangkok (Ref. 37773). Museum: Chao Phraya basin, CAS 79151. Museum: Mekong, CAS 97043 (near Chiang Saen); CAS 79087, 92502 (Huay Nam Ngam & Mekong mainstream 1 km downriver from That Phanom); CAS 96721 (near Chiang Khan) (Ref. 5515). Also Ref. 9648, 27732, 36654. 
Ambassidae Parambassis thomassi (Day, 1870) Fr native   13.60 cm TL male/unsexed  Reported from Chao Phraya river (Bangkok), Nonthaburi and Phra Nakhon Si Ayutthaya (Ref. 37773). 
Ambassidae Parambassis vollmeri Roberts, 1995 Fr native   8.00 cm NG male/unsexed  Found only from the large, clearwater tributaries of the Salween basin: Nam Mae Sa Nga, Huay Khong, Menam Pai, and Menam Moei. 
Ambassidae Parambassis wolffii (Bleeker, 1850) Fr native   20.00 cm SL male/unsexed  Known from the Chao Phraya basin (Ref. 10429), Mekong, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Bang Torani, Lanthe (Phra Nakhon Si Ayutthaya) and Ko Yai (Phathum Thani), Lop Buri, Bang Pakong river (Chachoengsao), Sikuk river (Phra Nakhon Si Ayutthaya) and Nakhon Sawan (Ref. 37773). Also Ref. 36654. 
Mugilidae Paramugil parmatus (Cantor, 1849) Fr, Br, M native   30.00 cm TL male/unsexed  Reported from Paknam (Samut Prakan), Bangkok, Krabi and Tha Chin river (Samut Sakhon) (Ref. 37773). 
Cyprinidae Parasikukia maculata Doi, 2000 Fr native   3.75 cm SL male/unsexed  Museum: small stream at Moneliong, Khao Yoi, Phetchaburi Province, NSMT-P 58550 (holotype, 3.75 cm SL) (Ref. 42106). 
Osphronemidae Parosphromenus paludicola Tweedie, 1952 Fr native   3.70 cm TL male/unsexed  Restricted to peats of Toh Daeng Peat (Ref. 57235). Also Ref. 2060. 
Dasyatidae Pastinachus sephen (Fabricius, 1775) Fr error  Krabane thong (Thai)  183 cm WD male/unsexed  Outside distributional range (Ref. 114953). 
Dasyatidae Pastinachus stellurostris Last, Fahmi & Naylor, 2010 Fr, Br questionable   42.80 cm WD male/unsexed  A juvenile male (MTUF P 30003), collected about 60 km upstream from the mouth of the Bang Pakong River in Thailand, may represent the first record of this species outside Borneo, more specimens are needed to resolve this issue (Ref. 84289). 
Pristigasteridae Pellona ditchela Valenciennes, 1847 Fr, Br, M, Fi native   16.00 cm SL male/unsexed  Occurs in Krabi (Ref. 1632); also from Klong Wan (Prachuap Khiri Khan), Chon Buri and Samut Prakan (Ref. 37773). Also Ref. 188. 
Sciaenidae Pennahia argentata (Houttuyn, 1782) Fr, Br, M questionable   40.00 cm SL male/unsexed  Reported from Tha Chin river (Samut Sakhon), Lem Sing (Chanthaburi), Mae Klong river (Samut Songkhram) and Samut Prakan (Ref. 37773). Outside distributional range, occurrence needs verification. 
Oxudercidae Periophthalmodon schlosseri (Pallas, 1770) Fr native   27.00 cm TL male/unsexed  Collected at Ao Pattani, Pattain; Ao Pak Pha-nang, Nakhon Si Thammarat; Ao Ban Don Suratthani; Ao Phanangtak, Chumphon (Ref. 49729); also from Nonthaburi, Samrong canal (Samut Prakan) and Samut Sakhon (Ref. 37773). Also Ref. 7050. 
Oxudercidae Periophthalmodon septemradiatus (Hamilton, 1822) Fr native   10.00 cm SL male/unsexed  Known from Andaman Sea (Ref. 37773). Also Ref. 7050. 
Cyprinidae Pethia stoliczkana (Day, 1871) Fr native   5.00 cm SL male/unsexed  Known from Mekong, Meklong and upper Chao Phraya basins (Ref. 43281); also from Mae Hong Son, Tak, Chiang Mai, Kanchanaburi and Phrae (Ref. 37773). 
Cyprinidae Pethia ticto (Hamilton, 1822) Fr native   12.52 cm TL male/unsexed  Known from Salween, Chao Phraya and Mekong basins (Ref. 26336). Collected at Mae Nam Fang, 35 km south of Fang on road to Chiang Mai, Mekong basin, Chiang Mai Province (Ref. 39226). Also Ref. 4537, 4832, 26580, 43281. 
Siluridae Phalacronotus apogon (Bleeker, 1851) Fr native  Pla nam ngern (Thai), Pla cha oan (Thai), Pla daeng (Thai), Pla deng (Thai), Pla nua on (Thai), ปลาชะโอน (Thai), ปลาน้ำเงิน (Thai), ปลาเนื้ออ่อน (Thai), ปลาแดง (Thai)  130 cm SL male/unsexed  Occurs in Mekong and Chao Phraya (Ref. 27732), Maeklong and Peninsular Thailand river systems (Ref. 26336); also from Nonthaburi, Khon Kaen, Phra Nakhon Si Ayutthaya and Ubon Ratchathani (Ref. 37773). Also Ref. 9648. 
Siluridae Phalacronotus bleekeri (Günther, 1864) Fr, Fi, Ex native  Pla nua on (Thai), Daeng (Thai), Num ngern (Thai), Pla daeng (Thai), Pla deng (Thai), Pla ked (Thai), Pla ket (Thai), ปลาเกด (Thai), ปลาเนื้ออ่อน (Thai), ปลาแดง (Thai)  60.00 cm SL male/unsexed  Occurs throughout the Chao Phraya and its tributary (Pasak), and in the Tapi (Ref. 1632), Mekong River, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Nonthaburi, Phra Nakhon Si Ayutthaya, Khon Kaen and Kanchanaburi (Ref. 37773). Is adaptable to pond conditions but growth rate is not at satisfactory levels. Eaten fresh and smoked (Ref. 6459). 
Siluridae Phalacronotus micronemus (Bleeker, 1846) Fr native   50.00 cm SL male/unsexed  Known from the Mekong and Chao Phraya basins. Also recorded from Bangkok and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 7050. 
Phallostethidae Phenacostethus posthon Roberts, 1971 Fr, Br native   1.80 cm SL male/unsexed  Museum: Khlong Kla Sohm, about 15 km SW of Pungah Prov., MCZ 47300 (holotype, 1.67 cm SL, male); MCZ 47301A, 47301B. Khlong Langu at Langu Town, 48 km NW of Satul Town, MCZ 47302 (Ref. 12768); also from Phangnga (Ref. 37773).  No picture yet.
Phallostethidae Phenacostethus smithi Myers, 1928 Fr, Br native   2.00 cm TL male/unsexed  Known from Chao Phraya basin and coastal streams of south-east Thailand (Ref. 12041). Museum: Bangkok, AMNH 9247 (holotype, 1.35 cm SL, dextral male): AMNH 9248; USNM 92979, 202564, 104417, 92297; CAS-SU 26520; ANSP 108764 (ex.SU 26520) (paratypes) (Ref. 12768); also from Chanthaburi (Ref. 37773). 
Nemacheilidae Physoschistura chulabhornae Suvarnaraksha, 2013 Fr native   3.99 cm SL male/unsexed ;3.65 cm SL female  Type locality of Physoschistura chulabhornae, Maechaem River basin, a tributary of Ping River, northern Chaophraya River Basin, Maechaem District, Chiangmai Province (Ref. 94424).  No picture yet.
Nemacheilidae Physoschistura pseudobrunneana Kottelat, 1990 Fr native   10.00 cm NG male/unsexed  Occurs in Chao Phraya (Ref. 26580) and in Nam Mae Fang and Nam Mae Lamao, two tributaries of the Nam Mae Khok, itself a tributary of the Mekong, and in Mae Nam Ping basin (Ref. 39226). Type locality: Nam Mae Lao at km 62 and 65 along road from Chiang Mai to Chiang Rai, Chiang Rai Prov., Mekong basin, Thailand (Ref. 33021). 
Ophichthidae Pisodonophis boro (Hamilton, 1822) Fr, Br, M, Fi native   100.00 cm TL male/unsexed  Occurs in Nontaburi (Nonthaburi); Bangkok; Trat; and Tale Sap (Thale Sap), Outer lake (Ref. 1632); also from the Gulf of Thailand (Ref. 37773). Also Ref. 7050. 
Ophichthidae Pisodonophis cancrivorus (Richardson, 1848) Fr, Br, M, Fi native  Lai-ngu (Thai), ไหลงู (Thai)  108 cm TL male/unsexed  Occurs in the Gulf of Thailand, off Maenam Chao Phaya (Chao Phraya) and the Chanthaburi Estuary at Laem Sing. Also known from Trat and Klong Wan (Prachuap Khiri Khan) (Ref. 37773). Also Ref. 52823. 
Mugilidae Planiliza macrolepis (Smith, 1846) Fr, Br, M native   60.00 cm SL male/unsexed  Found in mangrove forests at Ban Don Bay and Phang-nga Bay; also from Tha Chin river (Samut Sakhon) and Si Racha (Chon Buri) (Ref. 37773). 
Mugilidae Planiliza planiceps (Valenciennes, 1836) Fr, Br, M, Fi native   70.00 cm TL male/unsexed  Known from Klong Wan (Prachuap Khiri Khan), Songkhla and Si Racha (Chon Buri) (Ref. 37773). Also Ref. 2109. 
Mugilidae Planiliza subviridis (Valenciennes, 1836) Fr, Br, M, Fi native  Krabok (Thai), กระบอก (Thai)  40.00 cm SL male/unsexed  Found in mangrove forest at Ban Don Bay (Ref. 36921); also reported from Klong Wan (Prachuap Khiri Khan), Si Racha (Chon Buri), Songkhla, and Samut Prakan (Ref. 37773). Also Ref. 2109, 52823. 
Schilbeidae Platytropius siamensis (Sauvage, 1883) Fr, Thr extirpated  Siamese schilbeid catfish (English)  20.00 cm TL male/unsexed  Known only from Chao Phraya and Bang Pakong basins (Ref. 58784). Reported from Phra Nakhon Si Ayutthaya, Chai Nat, Nakhon Nayok river and Nakhon Sawan (Ref. 37773). Wiped out or disappeared due to habitat loss and possibly pollution (Ref. 58784). Also Ref. 6868. Status of threat: Extinct (Ref. 58784). 
Haemulidae Plectorhinchus gibbosus (Lacepède, 1802) Fr, Br, M native  Khinokpakmu (Thai), ขี้นกปากหมู (Thai)  75.00 cm TL male/unsexed  Reported from Songkhla, Kantang (Trang) and Lem Sing (Chanthaburi) (Ref. 37773). 
Plotosidae Plotosus canius Hamilton, 1822 Fr, Br, M, Fi native  Pla duk tale (Thai), Gray eel catfish (English)  111 cm TL male/unsexed  Known from Songkhla, Chon Buri, Samut Prakan and Chanthaburi (Ref. 37773). Also Ref. 36654, 36921, 43281. 
Poeciliidae Poecilia reticulata Peters, 1859 Fr introduced   5.00 cm SL male/unsexed ;6.00 cm SL female   
Poeciliidae Poecilia velifera (Regan, 1914) Fr introduced   15.00 cm TL male/unsexed   
Polynemidae Polynemus aquilonaris Motomura, 2003 Fr native   15.80 cm SL male/unsexed  Occurs in the Chao Phraya River system (Ref. 49954, 57343). Type locality: Chao Phraya River (purchased at Samyam market by H. Senou) (Ref. 49954). 
Polynemidae Polynemus dubius Bleeker, 1853 Fr native   20.00 cm SL male/unsexed  Occurs in the Chao Phraya basin (Ref. 43281). Reported from Bangkok, Paknam (Samut Prakan), Phra Nakhon Si Ayutthya, Nakhon Sawan, and Nonthaburi (Ref. 37773). Also Ref. 9685. 
Polynemidae Polynemus multifilis Temminck & Schlegel, 1843 Fr, Br native   28.00 cm SL male/unsexed  Known from the Koke Tong Canal, a tributary of the Chao Phraya River (Ref. 9685). Reported from Bang Khen (Bangkok) (Ref. 37773). 
Haemulidae Pomadasys argenteus (Forsskål, 1775) Fr, Br, M native   70.00 cm TL male/unsexed  Reported from Rayong, Krabi, Lang Suan (Chumphon), Lem Sing (Chanthaburi), Samut Prakan, Pattani, Songkhla, Mae Klong river (Samut Songkhram) and Klong Wan (Prachuap Khiri Khan) (Ref. 37773). 
Haemulidae Pomadasys argyreus (Valenciennes, 1833) Fr, Br, M native   40.00 cm TL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan) and Bang Pakong river (Chachoengsao) (Ref. 37773). 
Cyprinidae Poropuntius bantamensis (Rendahl, 1920) Fr native    Known from the Mekong and Chao Phraya basins (Ref. 26336). Also Ref. 35912.  No picture yet.
Cyprinidae Poropuntius chondrorhynchus (Fowler, 1934) Fr native   30.00 cm NG male/unsexed  Occurs in Salween, Maeklong, Chao Phraya and Mekong basins; also from Chiang Rai and Chaiyaphum (Ref. 37773). 
Cyprinidae Poropuntius deauratus (Valenciennes, 1842) Fr questionable   16.95 cm TL male/unsexed  Outside distributional range given by Ref. 36949; probably a misidentification. Reported from the Maeklong, Chao Phraya, Mekong, peninsular and southeast Thailand river systems (Ref. 26336). Large numbers formerly migrated between the Mekong mainstream and the Mun River, but this migration has been blocked by the Pak Mun hydroelectric dam (situated about 5 km up the Mun River from its mouth into the Mekong) (Ref. 35912); also from Chanthaburi, Kanchanaburi, Tak, Phrae, Mae Hong Son and Uthai Thani (Ref. 37773). Also Ref. 12693, 36654. 
Cyprinidae Poropuntius faucis (Smith, 1945) Fr native   4.06 cm SL male/unsexed  Known from the Chao Phraya basin. Also recorded from Chiang Mai (Ref. 37773). Also Ref. 26580, 35912. 
Cyprinidae Poropuntius genyognathus Roberts, 1998 Fr native   11.90 cm SL male/unsexed  Found in Kraburi River (Ref. 94495). 
Cyprinidae Poropuntius hampaloides (Vinciguerra, 1890) Fr native   12.80 cm TL male/unsexed  Known from the Mae Khlong basin.  No picture yet.
Cyprinidae Poropuntius hathe Roberts, 1998 Fr native   6.55 cm SL male/unsexed  Type locality: Rapids in Menam Moei R. next to hwy 1035, 129 km north of Mae Sot, Thailand.  No picture yet.
Cyprinidae Poropuntius heterolepidotus Roberts, 1998 Fr native   13.80 cm SL male/unsexed  Type locality: Nam Khong near Nam Tok Susa, Salween basin, Thailand.  No picture yet.
Cyprinidae Poropuntius huguenini (Bleeker, 1853) Fr questionable  Tapien (Thai)  46.00 cm TL male/unsexed  Occurs in Mekong River and its tributaries (Ref. 9648); also from Mae Kok (Chiang Rai) (Ref. 37773).  No picture yet.
Cyprinidae Poropuntius laoensis (Günther, 1868) Fr native   32.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 26336). Museum: Mekong river at Chiang Khan, CAS 63041 (Ref. 5515). Also Ref. 12693, 27732, 35912, 43281. 
Cyprinidae Poropuntius melanogrammus Roberts, 1998 Fr native   5.63 cm SL male/unsexed  Type locality: Huay Sangkalia on road to Chedi Sam Ong, 7 km north of Sangklaburi, Thailand. Known only from the swift, clearwater tributaries of the Meklong basin. 
Cyprinidae Poropuntius normani Smith, 1931 Fr native   13.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). Type locality: Pliew waterfall on Kao Sabap, near Chantabun (Ref. 40966). 
Cyprinidae Poropuntius scapanognathus Roberts, 1998 Fr native   12.30 cm SL male/unsexed  Type locality: Huay Kong, just below mouth of Huay Long R., near km 45 on hwy 1126, northwest of Mae Hong Son, Salween basin, Thailand. 
Cyprinidae Poropuntius speleops (Roberts, 1991) Fr endemic   5.79 cm SL male/unsexed  Found in the Mekong River (Ref. 26336); also from Tham Pathewada (Chaiyaphum) (Ref. 37773). Type locality: Tham Phu Khieo, Phu Khieo Wildlife Sanctuary, 101°32'10"E, 16°02'05"N, Thailand. Also Ref. 12255, 27297, 35912. 
Gobiidae Priolepis semidoliata (Valenciennes, 1837) Fr native   2.40 cm SL male/unsexed  Reported from southeastern Thailand and Lem Sing (Chanthaburi) (Ref. 37773). 
Pristidae Pristis microdon Latham, 1794 Fr, Br, M, Fi, Thr native  Largetooth sawfish (English)  700 cm TL male/unsexed  Occurs in Menam Chao Phya at Nontaburi and Tachin, and in Rayong (Ref. 1632); Prachuap Khiri Khan (Ref. 37773). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 9859, 41819. Status of threat: Critically Endangered (Ref. 58784). 
Pristidae Pristis zijsron Bleeker, 1851 Fr, Br, M, Fi, Thr native  Longcomb sawfish (English)  730 cm TL male/unsexed  Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Critically Endangered (Ref. 58784). 
Pristolepididae Pristolepis fasciata (Bleeker, 1851) Fr, Br, M, Fi native  Nandid perch (English), Pla chang yieb (Thai), Pla mhor chang yieb (Thai), Pla mhor nam (Thai), Pla mo takap (Thai), Pla mor chang yieb (Thai), Pla mor nam (Thai), Pla na neol (Thai), Pla na nual (Thai), Pla prok (Thai), Pla ta krub (Thai), ปลาช้างเหยียบ (Thai), ปลาตะกรับ (Thai), ปลาหน้านวล (Thai), ปลาหมอช้างเหยียบ (Thai), ปลาหมอน้ำ (Thai), ปลาโพรก (Thai)  31.00 cm TL male/unsexed 7.5 NG Occurs in the Chao Phraya, Mekong, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Tale Sap Songkhla, Chiang Mai, Hua Mak (Bangkok), Bua Yai (Nakhon Ratchasima), Pattani, Chanthaburi, Mun river (Prachuap Khiri Khan), Tapi river (Surat Thani), Phra Nakhon Si Ayutthaya and Ubon Ratchathani (Ref. 37773). Also Ref. 9648, 27732, 36654, 37766, 41236, 57235. 
Pristolepididae Pristolepis grootii (Bleeker, 1852) Fr native   18.40 cm TL male/unsexed  Inhabits lowland streams and peats in peninsular Thailand (Ref. 57235). 
Cyprinidae Probarbus jullieni Sauvage, 1880 Fr, Br, Fi, Ex native  Pla yee sok (Thai), Pbla yesok (Thai), Pla eesok (Thai), Pla eun (Thai), Pla ye sok (Thai), Pla ye sok tead (Thai), Pla ye sok ted (Thai), Pla ye sok tong (Thai), Pla yisok (Thai), ปลายี่สก (Thai), ปลายี่สกทอง (Thai), ปลายี่สกเทศ (Thai), ปลาเอิน (Thai) scarce (very unlikely) 150 cm SL male/unsexed  Known from Maeklong, Chao Phraya and Mekong basins. No longer exists as a naturally occurring species in the Chao Phraya ad Meklong basins. Seems not capable of reproducing in reservoirs and will probably disappear from these river basins when stocking of artificially reproduced fish is stopped. May still occur in Nan (Sirikit Dam) from artificially produced fry released by the Dept. of Fish. Staff at Sri Chiengmai near Nongkhai (Ref. 7427). In the Mekong, this fish migrates upstream to spawn from October to February from Kompong Cham in Cambodia to Chiang Khong in Thailand (Ref. 37770). In Sungkom at Nong Khai Province, it migrates together with two other Probarbus species, but spawns separately, during January-February (Ref. 37770). Early stage eggs could be observed in October-November (Ref. 37770). Also undertakes trophic migrations, mainly taken by juveniles and sub-adults at the onset of the flood season. At Nakhon Phanom, juveniles stay near the beach and when the beach begins to be covered with water, they migrate upstream and spend the flood season in flooded areas. At Loei, they move up the Loei River and into flooded areas and at this time, juveniles can not be seen in the Mekong (Ref. 37770). Esteemed food fish. The meat is considered excellent and the eggs are especially priced (Ref. 12369). Museum: Mekong, CAS 63028 (Chiang Khan); CAS 95474 (mainstream near Chiang Khan) (Ref. 5515); also from Phra Nakhon Si Ayutthaya, Kanchanaburi and Ubon Ratchathani (Ref. 37773). Also Ref. 2073, 12369, 26336, 26580, 36654, 43281. 
Cyprinidae Probarbus labeamajor Roberts, 1992 Fr, Thr native  Thicklip barb (English)  150 cm SL male/unsexed  Occurs in the Mekong River. Also known from Khong Chiam (Ubon Ratchathani) and Nong Khai (Ref. 37773). Threatened due to overfishing (Ref. 58784). Also Ref. 7427, 12255, 43281. Status of threat: Endangered (Ref. 58784). 
Cyprinidae Probarbus labeaminor Roberts, 1992 Fr, Thr native  Thinlip barb (English)  150 cm TL male/unsexed  Known from the Mekong River (Ref. 26336). Although commonly found at the mouth of the Mun River by the University of Michigan team in 1975, it may already be suffering negative impact from the Pak Mun dam (Ref. 12693). Found near That Phanom (Ref. 33021). Of little or no fisheries significance (Ref. 12369). Threatened due to overfishing (Ref. 58784). Museum: Mekong river at Mukdahan, Kiltipong Jarutanin, CAS 76171 (Ref. 5515); also from Nakhon Phanom and Mukda Han (Ref. 37773). Also Ref. 7427, 12255, 43281. Status of threat: Endangered (Ref. 58784). 
Oxudercidae Pseudapocryptes elongatus (Cuvier, 1816) Fr, Br, M native   20.00 cm TL male/unsexed  Known from Thai waters, Songkhla and Klong Dan (Samut Prakan) (Ref. 37773). Also Ref. 7050. 
Sisoridae Pseudecheneis sulcata (McClelland, 1842) Fr, Thr native  Remora catfish (English)  20.00 cm TL male/unsexed  Known from the upper Salween basin (Ref. 58784). Threatened due to habitat loss (Ref. 58784). Status of threat: Endangered (Ref. 58784). 
Horabagridae Pseudeutropius indigens Ng & Vidthayanon, 2011 Fr native   6.71 cm SL male/unsexed  Type locality, Narathiwat Province, Toh Daeng peat swamp, Khlong Pak Pla, NIFI 3074 (holotype of Pseudeutropius indigens, 6.71 cm SL). This species is known from the Toh Daeng peat swamp forest (within the Mae Nam Sungai Kolok drainage) in southern (peninsular) Thailand, and possibly present in river drainages northwards to the Isthmus of Kra as far north as the Tapi River (Ref. 87871). 
Akysidae Pseudobagarius hardmani (Ng & Sabaj Pérez, 2005) Fr native   4.23 cm SL male/unsexed  Known from Chao Phraya River (Ref. 55975). 
Akysidae Pseudobagarius leucorhynchus (Fowler, 1934) Fr native   3.02 cm SL male/unsexed  Found in the Chao Phraya (Ref. 12041, 37037), Mekong (Ref. 30857) and southern Peninsular Thailand (Ref. 30226); also from Chiang Mai (Ref. 37773). 
Akysidae Pseudobagarius macronemus (Bleeker, 1860) Fr native   5.00 cm SL male/unsexed  Reported from Chanthaburi, Pattani and Kanchanaburi (Ref. 37773). 
Akysidae Pseudobagarius subtilis (Ng & Kottelat, 1998) Fr native   4.00 cm SL male/unsexed  Known from the Mekong basin at Nakhon Phanom in northeastern Thailand (Ref. 30226). Type locality, Nakhon Phanom, Mekong River, downstream Ban Tha Kai, downstream Mukdahan, Yongsak and Suban. (Ref. 30226). Also Ref. 26336, 33021. 
Gobiidae Pseudogobiopsis oligactis (Bleeker, 1875) Fr native   6.00 cm TL male/unsexed  Recorded from various localities (Ref. 43716). Also Ref. 419. 
Gobiidae Pseudogobius avicennia (Herre, 1940) Fr native   3.55 cm SL male/unsexed  Collected from Chantaburi and Narathiwat provinces and Katumban (Ref. 126575).  No picture yet.
Gobiidae Pseudogobius poicilosoma (Bleeker, 1849) Fr, Br native   6.50 cm TL male/unsexed  Known from Klong Wan (Prachuap Khiri Khan) (Ref. 37773) and Sikao, SW Thailand (Ref. 52823). 
Balitoridae Pseudohomaloptera sexmaculata (Fowler, 1934) Fr endemic    Known from the Chao Phraya basin; also reported from Chiang Mai (Ref. 37773). Also Ref. 12041. 
Pangasiidae Pseudolais micronemus (Bleeker, 1846) Fr, Aq native  Pla sang ka ward thong to (Thai), Pla sa wai (Thai), Pla sang ka wart tong to (Thai), ปลาสวาย (Thai), ปลาสังกะวาดท้องโต (Thai)  100.00 cm male/unsexed  Found in the Mekong River and its tributaries (Ref. 9648) and Chao Phraya River (Ref. 26336); also from Bangkok, Nonthaburi, Nakhon Sawan and Ubon Ratchathani (Ref. 37773). Also Ref. 37773, 43281. 
Pangasiidae Pseudolais pleurotaenia (Sauvage, 1878) Fr, Fi native  Pla sang ka wart (Thai)  35.00 cm SL male/unsexed  Found in Mekong River and its tributaries (Ref. 9648), Lopburi River (Ref. 1632), Chao Phraya, Maeklong and Peninsular Thailand river systems (Ref. 26336). Also Ref. 7432, 36654, 37773. 
Bagridae Pseudomystus bomboides Kottelat, 2000 Fr native   4.20 cm SL male/unsexed  Found in the Mekong basin (Ref. 43281).  No picture yet.
Bagridae Pseudomystus leiacanthus (Weber & de Beaufort, 1912) Fr native   6.20 cm SL male/unsexed  Known from peats. 
Bagridae Pseudomystus siamensis (Regan, 1913) Fr, Fi, Or native  Pla khae moo (Thai), Pla kayeng hin (Thai), Pla kot hin (Thai), ปลากดหิน (Thai), ปลาแขยงหิน (Thai), ปลาแค้หมู (Thai), Siamese catfish (English)  18.00 cm TL male/unsexed  Known from the Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Phrae, Phitsanulok, Chiang Mai, Nakhon Ratchasima, Trang, Uthai Thani, Phra Nakhon Si Ayutthaya, Kanchanaburi, Nakhon Phanom, Khon Kaen, Songkhla, Yala, Surat Thani, Chanthaburi and Narathiwat (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Museum: Mekong river at Chiang Khan, CAS 63021 (Ref. 5515). Also Ref. 6868, 9648, 1632, 36654. 
Bagridae Pseudomystus stenomus (Valenciennes, 1840) Fr native   12.00 cm TL male/unsexed  Known from Yala, Surat Thani, Kanchanaburi, Chanthaburi and Narathiwat (Ref. 37773). Also Ref. 12693, 36654. 
Psilorhynchidae Psilorhynchus tysoni Conway & Pinion, 2016 Fr endemic    5.38 cm SL male/unsexed  Known currently only from a few localities on the Mae Nam Moei and its tributary the Hue Mae Song, Tak Province (Ref. 110241).  No picture yet.
Siluridae Pterocryptis berdmorei (Blyth, 1860) Fr questionable   21.40 cm SL male/unsexed  Possibly found in western Thailand (Ref. 58032). 
Siluridae Pterocryptis buccata Ng & Kottelat, 1998 Fr, Thr endemic  Cave sheatfish (English)  14.66 cm SL male/unsexed  Presently known only from Amphoe Sai Yok in the Meklong basin in Kanchanaburi Province, western Thailand (Ref. 33585). Threatened due to habitat loss (Ref. 58784). Status of threat: Endangered (Ref. 58784).  No picture yet.
Siluridae Pterocryptis cochinchinensis (Valenciennes, 1840) Fr, Fi native   40.10 cm TL male/unsexed  Known from Trang (Ref. 37773). 
Siluridae Pterocryptis torrentis (Kobayakawa, 1989) Fr native   20.00 cm TL male/unsexed  Known from Surat Thani, Trang and Chanthaburi (Ref. 37773). Also Ref. 4833. 
Sciaenidae Pterotolithus lateoides (Bleeker, 1849) Fr, Br, M native   50.00 cm SL male/unsexed  Reported from Klong Wan (Prachuap Khiri Khan) (Ref. 37773). 
Cyprinidae Puntigrus partipentazona (Fowler, 1934) Fr native   6.00 cm TL male/unsexed  Known from the Chao Phraya, Mae Khlong basins and coastal streams of South-East Thailand (Ref. 12041); also from Mekong and Peninsular Thailand river systems (Ref. 26336); also from Songkhla, Chanthaburi, Phattalung, Nakhon Sawan, Kanchanaburi, Khon Kaen, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 36654, 37831, 26580, 43281. 
Cyprinidae Puntioplites bulu (Bleeker, 1851) Fr, Fi native   44.30 cm TL male/unsexed  Known from Phatthalung and Ubon Ratchathani (Ref. 37773). 
Cyprinidae Puntioplites falcifer Smith, 1929 Fr native   40.00 cm male/unsexed  Occurs in the Mekong basin. From Loei-Chiang Rai Province, upstream migration occurs in February-May and July-August, but the main period of upstream migration is from March-April; downstream migration takes place in September-November. From Champassack in southern Laos to Nakhon Phanom Province in Thailand, upstream migrations occur in May-June and dowstream migrations in November-December (Ref. 37770). Also Ref. 27732, 37770, 43281. 
Cyprinidae Puntioplites proctozystron (Bleeker, 1865) Fr native  Pla kra mang (Thai), Smith's barb (English), Pla e-liem (Thai), Pla kamang (Thai), Pla leim (Thai), Pla liem (Thai), Pla mang (Thai), Pla pae (Thai), Pla ve (Thai), Pla vee (Thai), ปลากระมัง (Thai), ปลามัง (Thai), ปลาวี (Thai), ปลาอีเหลี่ยม (Thai), ปลาเลี่ยม (Thai), ปลาเหลี่ยม (Thai), ปลาแพะ (Thai)  44.00 cm TL male/unsexed  Occurs in Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems. Also known from Bangkok, Nonthaburi, Phra Nakhon Si Ayutthaya, Nakhon Ratchasima, Khon Kaen, Kanchanaburi, Nakhon Sawan, Ubon Ratchathani, Nong Khai, Kalasin, Krabi, Phitsanulok, Phrae and Surat Thani (Ref. 37773). Also Ref. 9648, 12693, 26580, 36654, 43281, 45563. 
Cyprinidae Puntioplites waandersi (Bleeker, 1859) Fr native   50.00 cm TL male/unsexed  Known from the Mekong River (Ref. 26336). Museum: Mekong river at Chiang Khan, CAS 63039 (Ref. 5515). Also Ref. 7050, 43281. 
Cyprinidae Puntius bramoides (Valenciennes, 1842) Fr native   32.50 cm TL male/unsexed  Reported from Chiang Rai, Chiang Mai and Phra Nakhon Si Ayutthaya (Ref. 37773).  No picture yet.
Cyprinidae Puntius brevis (Bleeker, 1849) Fr native  Pla i gun ar nok pu ra (Thai), Pla e gun ar nok pu ra (Thai), Pla ta pien sai (Thai), Pla ta pien soi (Thai), Tapien (Thai), ปลาตะเพียนทราย (Thai), ปลาอิกันอานกปุระ (Thai)  14.00 cm TL male/unsexed  Occurs in the Chao Phraya, Mekong (Ref. 27732, 26580), Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336, 26580). Found in Phrae, Phitsanulok, Songkhla, Pattani, Phetchaburi, Rayong, Bangkok, Chanthaburi, Khon Kaen, Ubon Ratchathani, Kalasin, Nakhon Ratchasima, Phra Nakhon Si Ayutthaya, Nakhon Nayok, Chiang Rai, Phayao, Kanchanaburi, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 7050, 9648, 36654, 43281, 57235. 
Cyprinidae Puntius masyai Smith, 1945 Fr native   2.50 cm TL male/unsexed  Known from the Mekong basin. Also recorded from Chanthaburi (Ref. 37773). Also Ref. 12693. 
Cyprinidae Puntius sophoroides (Günther, 1868) Fr questionable    Occurrence in Chao Phraya needs further confirmation (Ref. 26580); also from Kanchanaburi, Khon Kaen and Nong Khai (Ref. 37773).  No picture yet.
Cyprinidae Puntius spilopterus (Fowler, 1934) Fr native    Known from the Chao Phraya River basin (Ref. 26580); also from Phrae, Chiang Mai and Phitsanulok (Ref. 37773). 
Danionidae Raiamas bola (Hamilton, 1822) Fr, Fi native   35.00 cm TL male/unsexed  Known from Chiang Rai (Ref. 37773). 
Danionidae Raiamas guttatus (Day, 1870) Fr, Fi native  Dorkmark (Thai), Pla nang ao (Thai), ปลานางอ้าว (Thai)  30.00 cm SL male/unsexed  Occurs in the Mekong, Chao Phraya and Salween basins (Ref. 26336, 27732), Maeklong and Peninsular Thailand river systems (Ref. 26336). Known from Rahaeng (Tak) and Maeklong River at Ban Pong, Rachaburi (Ref. 9648). Museum: Mekong mainstream near Chiang Khan, CAS 95468 (Ref. 5515); also from Uthai Thani, Kanchanaburi, Phra Nakhon Si Ayutthaya, Ubon Ratchathani, Nong Khai, Chiang Mai, Chiang Rai, Mae Hong Son, Phitsanulok and Kanchanaburi (Ref. 37773). Also Ref. 1632, 36654, 26580. 
Danionidae Rasbora amplistriga Kottelat, 2000 Fr native   3.40 cm SL male/unsexed  Occurs in small coastal basins of south-eastern Thailand (Ref. 36949). 
Danionidae Rasbora argyrotaenia (Bleeker, 1849) Fr native   14.00 cm TL male/unsexed  Occurs in Chiengmai (Chiang Mai); Chao Phaya (Chao Phraya) River; Maekhong; Koh Chang; Krabi; Nakhon Sritamarat (Nakhon Si Thammarat); Tale Sap (Thale Sap) (Ref. 1632); and Peninsular and Southeast Thailand river systems (Ref. 26336); also from Chanthaburi, Khon Kaen, Kanchanaburi, Phitsanulok and Surat Thani (Ref. 37773). Also Ref. 26580. 
Danionidae Rasbora aurotaenia Tirant, 1885 Fr native   15.00 cm SL male/unsexed  Known from the Maeklong, Chao Phrya and Mekong rivers (Ref. 26336). Recorded from Mekong at Pak Mun (Ref. 37786); also from Nakhon Sawan, Surat Thani and Kanchanaburi (Ref. 37773). Also Ref. 12041, 12693, 37773, 26580, 43281. 
Danionidae Rasbora bankanensis (Bleeker, 1853) Fr native   6.00 cm SL male/unsexed  Known from Kanchanaburi and Narathiwat (Ref. 37773). 
Danionidae Rasbora borapetensis Smith, 1934 Fr, Or native  Pla siew hang daeng (Thai), Pla siew hang dang (Thai), ปลาซิวหางแดง (Thai)  10.00 cm TL male/unsexed  Found in Mekong, Meklong and Chao Phraya basins and in the northern Malay Peninsula (Ref. 27732). Collected in the Mekong basin at Nam Man about 2 km upstream of Amphoe Dan Sai in Loei Province (Ref. 39226); also from Khon Kaen, Chachoengsao, Sakon Nakhon, Nakhon Sawan, Nakhon Ratchasima, Narathiwat, Phrae, Chanthaburi, Phitsanulok, Prachin Buri and Surat Thani (Ref. 37773). Also Ref. 1632, 9648, 26336, 36654, 26580. 
Danionidae Rasbora caudimaculata Volz, 1903 Fr native   17.00 cm SL male/unsexed  Reported from Kanchanaburi and Surat Thani (Ref. 37773). 
Danionidae Rasbora daniconius (Hamilton, 1822) Fr native   15.00 cm TL male/unsexed  Occurs in the Mekong, Chao Phraya and Salween basins and in the northern Malay Peninsula (Ref. 27732) and Mae Khlong basin (Ref. 26580). Reported from Sakon Nakhon, Tak, and Surat Thani (Ref. 37773). Also Ref. 26580, 41236, 43281. 
Danionidae Rasbora dorsinotata Kottelat, 1987 Fr native   4.32 cm SL male/unsexed  Known from Chao Phraya and Mekong basins (Ref. 26336). The type specimens from Mae Nam Huey Bon in Chiang Rai Province have been collected in a small creek with sandy bottom and slow current (Ref. 37821). Also Ref. 13287, 26580.  No picture yet.
Danionidae Rasbora dusonensis (Bleeker, 1850) Fr native   12.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732). Found in Chanthaburi, Khon Kaen, Kanchanaburi, Phitsanulok and Surat Thani (Ref. 37773). Also Ref. 12693, 36654. 
Danionidae Rasbora einthovenii (Bleeker, 1851) Fr, Or native   9.00 cm TL male/unsexed  Occurs in Menam Chao Phya (Chao Phraya) (Ref. 1632). Reported from Sakon Nakhon and Narathiwat (Ref. 37773). Also Ref. 4537. Not common in the aquarium trade (Ref. 57235). 
Danionidae Rasbora hobelmani Kottelat, 1984 Fr native   6.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 26336) and Mae Nam Ping basin at the Ban Na Hwai (Ref. 39226); also from Chiang Mai (Ref. 37773). Also Ref. 4832, 37822. 
Danionidae Rasbora lateristriata (Bleeker, 1854) Fr native  Pla siew kuai (Thai), Pla siew kuay (Thai), Siew (Thai), ปลาซิวควาย (Thai)  12.00 cm TL male/unsexed  Found in Mekong River and its tributaries. Also Ref. 1632. 
Danionidae Rasbora paviana Tirant, 1885 Fr native   12.00 cm SL male/unsexed  Occurs in the Mekong, Meklong and Chao Phraya basins and in the northern Malay Peninsula. Also Ref. 26336. 
Danionidae Rasbora rasbora (Hamilton, 1822) Fr native   13.00 cm TL male/unsexed  Occurs in Bangkok; Nontaburi (Nonthaburi); and Chanthaburi. Occurrence in Chao Phraya needs further confirmation (Ref. 26580). Also Ref. 4832, 41236, 43638. 
Danionidae Rasbora rubrodorsalis Donoso-Büchner & Schmidt, 1997 Fr native   3.30 cm SL male/unsexed  Type locality, Cha Am, 208/209 km Highway 4, southern Thailand (Ref. 40966). 
Danionidae Rasbora sumatrana (Bleeker, 1852) Fr native   13.00 cm TL male/unsexed  Known from the Chao Phraya and Maeklong basins (Ref. 26580). Reported from Pitsanulok (Phitsanulok), Me Poon, Rayong, and Trang (Ref. 1632); also from Khon Kaen, Pattani, Narathiwat, Nakhon Sawan, Kanchanaburi, Chanthaburi, Prachin Buri, and Surat Thani (Ref. 37773). Also Ref. 3310, 36654. 
Danionidae Rasbora tornieri Ahl, 1922 Fr native   17.00 cm SL male/unsexed   
Danionidae Rasbora trilineata Steindachner, 1870 Fr, Or native  Siew hang dok (Thai)  13.00 cm TL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732) and Maeklong basin (Ref. 26336). Museum: Rayong River, CAS 44434 (Ref. 2091); also from Khon Kaen, Pattani, Narathiwat, Kanchanaburi, Chanthaburi, Surat Thani, Phitsanulok and Prachin Buri (Ref. 37773). Also Ref. 1632, 9648, 26580, 36654. 
Danionidae Rasbosoma spilocerca (Rainboth & Kottelat, 1987) Fr native   2.60 cm SL male/unsexed  Known from the Mekong River. Also recorded from Ubon Ratchathani, Kalasin and Udon Thani (Ref. 37773). Also Ref. 43281. 
Gobiidae Rhinogobius chiengmaiensis Fowler, 1934 Fr, Thr native  Chiangmai stream goby (English)  5.00 cm TL male/unsexed  Known from the Chao Phraya basin in northern Thailand (Ref. 38646); also from Chiang Mai (Ref. 37773). Reported from the upper Ping basin (Ref. 58784). Threatened due to habitat loss (Ref. 58784). Status of threat: Endangered (Ref. 58784). 
Gobiidae Rhinogobius mekongianus (Pellegrin & Fang, 1940) Fr native   5.00 cm SL male/unsexed  Occurs in the Mekong (Ref. 27732) and Chao Phraya (Ref. 26336). Collected in Nam Mae Mao at Ban Huai Phak Phai and in Mae Nam Fang in the Mekong basin of Chiang Mai Province (Ref. 39226). Found in On Doi Hua Mot in Huey Melao, a tributary of the Mekok flowing into Mekong river, north of Chiengrai (Ref. 33021). Museum: Ching Mai Province, AMS I.25973-001 (Ref. 11224); also from Huey Melao at Doi Hua Mot, a tributary of the Mekok river (Chiang Rai) and Songkhla (Ref. 37773). Also Ref. 1632, 11224, 43281. 
Rhinidae Rhynchobatus djiddensis (Forsskål, 1775) Fr, Br, M misidentification   310 cm TL male/unsexed  Outside distributional range (Ref, 114953). Reported from the Gulf of Thailand, Chanthaburi, Trat, Songkhla and Andaman sea (Ref. 37773). 
Bagridae Rita sacerdotum Anderson, 1879 Fr, Thr native  Salween rita (English)  200 cm TL male/unsexed  Occasionally landed in Maesot (Ref. 94495). Threatened due to habitat loss and overfishing (Ref. 58784). Status of threat: Endangered (Ref. 58784). 
Cichlidae Rocio octofasciata (Regan, 1903) Fr, Br introduced   25.00 cm TL male/unsexed  Also Ref. 58915. 
Dorosomatidae Sardinella fimbriata (Valenciennes, 1847) Fr, Br, M, Fi native   19.00 cm TL male/unsexed  Reported from Andaman sea, Bay of Bengal, Si Racha (Chon Buri), Gulf of Thailand and Samut Prakan (Ref. 37773). Also Ref. 188. 
Cyprinidae Scaphiodonichthys acanthopterus (Fowler, 1934) Fr native   31.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins (Ref. 27732, 26336); also from Chiang Mai, Mae Hong Son and Tak (Ref. 37773). 
Cyprinidae Scaphiodonichthys burmanicus Vinciguerra, 1890 Fr native   22.00 cm TL male/unsexed  Recorded from the Nam Mae Mao at Ban Hui Phak Phai in the Mekong basin of Chiang Mai Province (Ref. 39226). Known from Chao Phraya (Ref. 26580); also from Mae Hong Son (Ref. 37773). Also Ref. 4832, 12693. 
Cyprinidae Scaphognathops bandanensis Boonyaratpalin & Srirungroj, 1971 Fr native   40.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 26336, 27732). Museum: North East Thailand, middle of Mekong at Ban Dan, Ubon Batahathani province, BMNH 1987.11.18.1-2 (Ref. 31982); also from Nakhon Phanom, Nong Khai and Ubon Ratchathani (Ref. 37773). Also Ref. 36654. 
Cyprinidae Scaphognathops stejnegeri (Smith, 1931) Fr native   25.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 26336, 27732) and near Ban Mekong (Ref. 33021); also from Pasak river (Sara Buri), Chai Nat and Kanchanaburi (Ref. 37773). Also Ref. 36654. 
Scatophagidae Scatophagus argus (Linnaeus, 1766) Fr, Br, M, Lf native  Pla takrab (Thai), Takrap (Thai), ตะกรับ (Thai)  45.00 cm TL male/unsexed  Found in mangrove forest at Ban Don Bay (Ref. 36921); also from Tale Sap Songkhla, Krabi, Chanthaburi, Bang Pakong river (Chachoengsao), Banghia, Paknam (Samut Prakan), Si Racha (Chon Buri), Klong Wan (Prachuap Khiri Khan) and Thai waters (Ref. 37773). 
Nemacheilidae Schistura alticrista Kottelat, 1990 Fr native   7.10 cm SL male/unsexed  Known only from the Nam Mae Yuam basin, a tributary of Salween River in Mae Hong Son Province and the Salween close to its confluence with the Nam Mae Yuan (Ref. 39226). Type locality: Amphoe Khum Huan, Tambon Muang Bon, Huei Nong Heng, Mae La Ka, Mae Hong Son Prov., Salween basin, Thailand (Ref. 33021). Also Ref. 26580, 37773. 
Nemacheilidae Schistura aurantiaca Plongsesthee, Page & Beamish, 2011 Fr native   4.08 cm SL male/unsexed  Known only from the Kwai Noi, Mae Khlong basin, in the Thong Pha Phum District of Kanchanaburi Province (Ref. 87184).  No picture yet.
Nemacheilidae Schistura bella Kottelat, 1990 Fr native   3.90 cm SL male/unsexed  Known from the Mekong and Maeklong basins (Ref. 26336). Found in Mae Nam Fang, 35 km south of Fang on road to Chiang Mai, Mekong basin, Chiang Mai Province (Ref. 39226). Also Ref. 26336, 33021, 26580, 37773, 95537.  No picture yet.
Nemacheilidae Schistura breviceps (Smith, 1945) Fr native   6.90 cm SL male/unsexed  Known from the Mekong and Maeklong basins (Ref. 26336). Found in Mae Nam Fang, 35 km south of Fang on road to Chiang Mai, Mekong basin, Chiang Mai Province (Ref. 39226); also from Phrae (Ref. 37773). Type locality: Menam Mao, trib. of Menam Fang, Mekong basin (Ref. 26282). Also Ref. 12041, 33021, 26580.  No picture yet.
Nemacheilidae Schistura bucculenta (Smith, 1945) Fr native   10.40 cm SL male/unsexed  Occurs in the Mekong River. Also known from Phrae (Ref. 37773). 
Nemacheilidae Schistura cincticauda (Blyth, 1860) Fr native   5.00 cm SL male/unsexed  Known from the tributaries of the Salween basin. Also recorded from Tak (Ref. 37773). 
Nemacheilidae Schistura deansmarti Vidthayanon & Kottelat, 2003 Fr native   10.47 cm SL male/unsexed  Known only from the type locality, Tham Phra Sai Ngam cave (Ref. 51711). 
Nemacheilidae Schistura deignani (Smith, 1945) Fr native    Type locality, Mountain brooks on Kao Sabap, near Chantabun, se. Thailand (Ref. 46206); also from Chanthaburi (Ref. 37773). 
Nemacheilidae Schistura desmotes (Fowler, 1934) Fr native   6.70 cm SL male/unsexed  Known from Chao Phraya and Mae Khlong basins; also reported from Kaeng Sok (Surat Than) (Ref. 37773). Also Ref. 12041, 78705.  No picture yet.
Nemacheilidae Schistura dubia Kottelat, 1990 Fr native   9.30 cm SL male/unsexed  Known from the Chao Phraya basin; also reported from Phrae, Lam Pang and Phitsanulok (Ref. 37773). Also Ref. 26580, 33690, 39226.  No picture yet.
Nemacheilidae Schistura fowleriana (Smith, 1945) Fr native    Type locality, Mepoon, central Thailand (Ref. 56787); also from Tak. And Chiang Mai (Ref. 37773).  No picture yet.
Nemacheilidae Schistura geisleri Kottelat, 1990 Fr native   3.20 cm SL male/unsexed  Known from Chao Phraya basin (Ref. 26580), upper reaches of Mae Nam Ping, Mae Nam Yom basins in northern Thailand and in Tapi basin in peninsular Thailand (Ref. 39226), Chiang Mai, Lam Phun, Phrae and Surat Thani (Ref. 37773). 
Nemacheilidae Schistura jarutanini Kottelat, 1990 Fr, Thr endemic  Kittipong's cave loach (English)  6.72 cm SL male/unsexed  Known only from Amphoe Sri Sawat, Tham Ba Dan in the Mae Nam Kwae Yai basin in western Thailand (Ref. 37830). Threatened due to human disturbance and overfishing (Ref. 58784). Type locality: Tham Ba Dan, Amphoe Sri Sawat, Kanchanaburi Prov. Also Ref. 3881. Status of threat: Critically Endangered (Ref. 58784). 
Nemacheilidae Schistura kengtungensis (Fowler, 1936) Fr native   11.00 cm SL male/unsexed  Occurs in Salween, Chao Phraya and Mekong basins; also reported from Chiang Mai, Chiang Rai, Loei and Chaiyaphum (Ref. 37773). Also Ref. 39226, 26580. 
Nemacheilidae Schistura kohchangensis (Smith, 1933) Fr native   7.50 cm SL male/unsexed  Known from the coastal rivers of southeastern Thailand (Ref. 33690) in provinces Trat, Chantaburi, Chonburi and on Koh Chang island (Ref. 39226); also reported from Chanthaburi and Phrae (Ref. 37773). Also Ref. 26580, 78705. 
Nemacheilidae Schistura kongphengi Kottelat, 1998 Fr native   9.07 cm SL male/unsexed  Occurs in the Mekong basin.  No picture yet.
Nemacheilidae Schistura laterimaculata Kottelat, 1990 Fr native   5.50 cm SL male/unsexed  Known from the Mekong River in Chaiyaphum Province on the Khorat Plateau (Ref. 12693) and Chaiyaphum (Ref. 37773). Also Ref. 12693, 26336, 39226, 26580. 
Nemacheilidae Schistura maejotigrina Suvarnaraksha, 2012 Fr native   5.30 cm SL male/unsexed  Known from the Maechaem River, a tributary of Ping River, in the upper Chao Phraya River drainage, Chiang Mai Province (Ref. 93077). 
Nemacheilidae Schistura maepaiensis Kottelat, 1990 Fr native   5.21 cm SL male/unsexed  Collected only in the tributaries of the Salween in Mae Hong Son Province (Ref. 39226). Type locality: Nam Mae Cha at Ban Pha Bong, 19°12'N, 97°59'E, 12 km south of Mae Hong son, Mae Hong Son Prov., Salween basin, Thailand (Ref. 33021). Also Ref. 26580, 37773, 95537. 
Nemacheilidae Schistura magnifluvis Kottelat, 1990 Fr native   8.50 cm SL male/unsexed  Found in the Mekong mainstream between Chiang Khan (17°50'N, 101°45'E) to 70 km downstream by road, Loei province (Ref. 39226). Museum: Mekong mainstream between Chiang Khan to 70 km downstream by road, CAS 62549, 62550, 62551 (Ref. 5515). Also Ref. 26336, 26580 33021, 37773, 43281. 
Nemacheilidae Schistura mahnerti Kottelat, 1990 Fr native   6.40 cm SL male/unsexed  Found only in tributaries of the Salween in Mae Hong Son and Tak provinces (Ref. 39226). Type locality: 20 km north of Mae Sariang, Mae Hong Son Prov., Salween basin, Thailand (Ref. 33021). Also Ref. 37773, 95537. 
Nemacheilidae Schistura menanensis (Smith, 1945) Fr native   5.90 cm SL male/unsexed  Known from the Chao Phraya basin (Ref. 12041); also from Nan. (Ref. 37773). Also Ref. 26580. 
Nemacheilidae Schistura moeiensis Kottelat, 1990 Fr native   5.30 cm SL male/unsexed  Known from the Mae Nam Moei basin, a tributary of the Salween (Ref. 39226) and Tak (Ref. 37773). Type locality: Huei Kite, Tambon Kanei Jiu, Amphoe Mae Sot, Salween basin, Tak Prov., Thailand (Ref. 33021).  No picture yet.
Nemacheilidae Schistura multifasciata (Day, 1878) Fr native   9.80 cm SL male/unsexed  Reported from Mae Hong Son (Ref. 37773). 
Nemacheilidae Schistura myrmekia (Fowler, 1935) Fr extirpated  scarce (very unlikely) 46.50 cm SL male/unsexed  One specimen collected in an area that recently has been highly modified by human activities. Recent efforts to find the species have failed, and it is probably extinct (Ref. 119614).  No picture yet.
Nemacheilidae Schistura nicholsi (Smith, 1933) Fr native   7.40 cm SL male/unsexed  Known from the Mekong basin. Collected at Nam Man about 2 km upstream of Amphoe Dan Sai in Loei Province (Ref. 39226); also from Chiang Mai, Phrae, Phitsanulok, Chanthaburi and Nakhon Ratchasima (Ref. 37773). Also Ref. 12693, 26336, 26563, 26580, 27732, 43281. 
Nemacheilidae Schistura oedipus (Kottelat, 1988) Fr endemic   5.43 cm SL male/unsexed  Collected from Mae Lana, Nam Lang, Huet, Ban Louk Kow Larm and Nong Pha Cham caves (Ref. 42927). Syntopic with Cryptotora thamicola in Tham Mae Lana (Ref. 42927); also from Mae Hong Son (Ref. 37773). Type locality: Tham Nam Lang in Mae Hong Son Province. Tham Nam Lang is an outflow cave east of Nam Khong, a tributary of Nam Mae Pai, itself a tributary of Salween River (Ref. 39226). Also Ref. 3881, 26580, 27299. 
Nemacheilidae Schistura pantherina Page, Plongsesthee & Randall, 2012 Fr native   6.02 cm SL male/unsexed  Found in Kroeng Krawia, Kwai Noi, Mae Khlong basin in the Thong Pha Phum District, Kanchanaburi Province (Ref. 93042).  No picture yet.
Nemacheilidae Schistura paucicincta Kottelat, 1990 Fr native   5.00 cm NG male/unsexed  Known from tributaries of Mae Nam Moei, itself a tributary of Salween (Ref. 39226). Type locality: Huai Mae Charno, 4 km south of Amphoe Mae Ramat on road 1085, 16°58'N, 98°34'E, Salween basin, Tak Prov., Thailand (Ref. 33021). Also Ref. 26580, 37773.  No picture yet.
Nemacheilidae Schistura poculi (Smith, 1945) Fr native   5.90 cm SL male/unsexed  Occurs in Mae Nam Ping basin at Chiang Mai Province, Salween basin at Mae Hong Son Province, Mekong basin at Chiang Mai and Chiang Rai Provinces (Ref. 39226), Chao Phraya and Maeklong basins (Ref. 26336). In the Mekong basin, known from Chiang Mai Province in Pong Nam Ron, in Nam Mae Mao at Ban Huai Phak Phai, in Nam Mae Chai and in Mae Nam Kok at Thaton; and from Chiang Rai Province in Nam Mae Lao, in Pang Meton, in Nam Tok Khun Koan and in Nam Mae Lao (Ref. 39226); also from Khon Kaen, Sakon Nakhon and Kanchanaburi (Ref. 37773). Also Ref. 1632, 12041, 26580, 43281. 
Nemacheilidae Schistura pridii Vidthayanon, 2003 Fr native   3.80 cm SL male/unsexed  Presently known only from headwaters of the river Mae Taeng in the upper Chao Phraya drainage, northern Thailand (Ref. 51709). 
Nemacheilidae Schistura reidi (Smith, 1945) Fr endemic  abundant (always seen in some numbers) 8.90 cm SL male/unsexed  Found only in the Salween basin in Mae Hong Son Province where it is one of the most abundant and common nenacheilines (Ref. 39226). Occurs in Huey Mekong Kha, mountain torrent at base of Doi Mekong Kha (Ref. 33021); also from Phrae (Ref. 37773). Also Ref. 1632. 
Nemacheilidae Schistura robertsi Kottelat, 1990 Fr native   5.60 cm SL male/unsexed  Apparently the only species of Schistura present in the Malay Peninsula (Ref. 33690). Also found in Phuket Island (Ref. 39226) and Surat Thani (Ref. 37773). Also Ref. 27732, 26580. 
Nemacheilidae Schistura schultzi (Smith, 1945) Fr native   9.30 cm SL male/unsexed  Known from the Chao Phraya basin, the Mekong basin in Chiang Rai and Loei provinces and the Mae Nam Nan basin, although this last record still needs confirmation (Ref. 39226); also from Phrae, Tak, Chiang Mai and Chanthaburi (Ref. 37773). Also Ref. 1632, 12041, 26336, 26580. 
Nemacheilidae Schistura sexcauda (Fowler, 1937) Fr native   5.10 cm SL male/unsexed  Known from the upper reaches of Chao Phraya and its tributary streams around the central plain of Thailand (Ref. 39226). Reported from Mekong basin (Ref. 26336); also from Phitsanulok, Mae Poon (Phrae), Chanthaburi and Prachin Buri (Ref. 37773). Museum: Mekong river at Chiang Khan CAS 63024 (Ref. 5515). Also Ref. 12041, 26580.  No picture yet.
Nemacheilidae Schistura similis Kottelat, 1990 Fr native   6.80 cm SL male/unsexed  Known from the Mae Nam Moei basin, a tributary of the Salween basin (Ref. 39226). Type locality: Amphoe Tha Song Yang, Tambon Kanei Jiu, Huei Ki Teu, Tak Prov., Salween basin, Thailand (Ref. 33021). Also Ref. 37773.  No picture yet.
Nemacheilidae Schistura sirindhornae Suvarnaraksha, 2015 Fr endemic  Crown Scaly Stream Loach (English)   7.89 cm SL male/unsexed ;7.86 cm SL female  Foun only in the tributaries of the upper Nan River basin, in Pua and Borkluea districts, Nan Province (Ref. 102608).  No picture yet.
Nemacheilidae Schistura spiesi Vidthayanon & Kottelat, 2003 Fr native   11.91 cm SL male/unsexed  Known from the entire length of the main stream passage of Tham Phra Wang Daeng cave (Ref. 51711). 
Nemacheilidae Schistura spilota (Fowler, 1934) Fr endemic   8.80 cm SL male/unsexed  Found in the Chao Phraya basin (Ref. 12041, 26580). Occurs in the Upper Mae Nam Ping drainage (Ref. 39226); also from Phrae and Chiang Mai (Ref. 37773). 
Nemacheilidae Schistura tenebrosa Kangrang, Page & Beamish, 2012 Fr native   4.60 cm SL male/unsexed  Found only in Kwai Noi, Mae Khlong basin in the Thong Pha Phum District of Kanchanaburi Province (Ref. 93080).  No picture yet.
Nemacheilidae Schistura udomritthiruji Bohlen & Ŝlechtová, 2010 Fr native   4.78 cm SL male/unsexed  Found in streams draining to the Andaman Sea in southern Thailand between Takua Pa and Ranong (Ref. 83421). Recorded from the river Kra in Ranong province (Ref. 95537).  No picture yet.
Nemacheilidae Schistura vinciguerrae (Hora, 1935) Fr native   8.00 cm NG male/unsexed  Reported from Mae Hong Son (Ref. 37773) and the Maeklong river (Ref. 78705). 
Nemacheilidae Schistura waltoni (Fowler, 1937) Fr native  common (usually seen) 7.80 cm SL male/unsexed  Widely distributed in the upper reaches of the three western branches of Mae Nam Chao Phraya: Mae Nam Ping, Mae Nam Wang and Mae Nam Yom where it is one of the commonest species in small mountain streams with fast and shallow water. Juveniles were observed at Ban Tham Chiang to form loose troups of 10-20 individuals (Ref. 39226); also from Phrae, Chaiya Phum and Chiang Mai (Ref. 37773). Also Ref. 1632, 12041, 26580. 
Osteoglossidae Scleropages formosus (Müller & Schlegel, 1840) Fr, Fi, Pr, Or, Thr native  Asian arowana (English), Pla ta pad (Thai), ปลาตะพัด (Thai)  90.00 cm TL male/unsexed  Can be found only in some restricted areas of Trat and Chanthaburi provinces. Its flesh has a good flavour and is used mainly for preparing special dishes (Ref. 6459); also from Surat Thani (Ref. 37773). Extirpated from most of its range in Thailand, including peat areas in Pattani and Phuket. Endangered species with highly demanded from aquarium trades, although enlisted in CITES and Thai legally protected species (Ref. 57235). Also Ref. 1632, 7050. Status of threat: Endangered (Ref. 58784). 
Nemacheilidae Sectoria atriceps (Smith, 1945) Fr native   4.34 cm SL male/unsexed  Found in the Chao Phraya basin (Ref. 12041, 26580). Recorded from the Mae Nam Nan basin in Nan Province (Ref. 39226); also from Phrae and Kon river (Nan) (Ref. 37773). Also Ref. 1632.  No picture yet.
Scatophagidae Selenotoca multifasciata (Richardson, 1846) Fr, Br, M native   40.00 cm SL male/unsexed   
Serpenticobitidae Serpenticobitis cingulata Roberts, 1997 Fr native   3.86 cm SL male/unsexed  Known from tributaries (Huay Ngao and Huay Huang) of the middle Mekong basin in northern Thailand. Also Ref. 43281.  No picture yet.
Engraulidae Setipinna melanochir (Bleeker, 1849) Fr, Br, M, Fi native   33.00 cm SL male/unsexed  Known from Menam Chao Phraya; Tachin (Samut Sakhon); Bangpakong River; Tale Sap (Thale Sap); Krabi; Songkhla; and Bangkham River, Lopburi (Ref. 1632). Known from Maeklong, Peninsular Thailand, Southeast Thailand and Mekong river systems (Ref. 26336); also from Phra Nakhon Si Ayutthaya, Nakhon Sawan, Ubon Ratchathani (Ref. 37773). Also Ref. 189, 12693, 36654. 
Engraulidae Setipinna wheeleri Wongratana, 1983 Fr, Br native   30.00 cm NG male/unsexed  Reported from Ranong province (Ref. 94495). 
Cyprinidae Sikukia gudgeri (Smith, 1934) Fr native   18.00 cm SL male/unsexed  Known from the Chao Phrya and Mekong basins (Ref. 27732, 26336). Museum: Khong Chiam market (near confluence of Mekong and Mun river) CAS 81583; CAS 63044 (Chiang Khan) (Ref. 5515); also from Nan river, Kemarat (Ubon Ratchathani) and Nong Khai (Ref. 37773). Also Ref. 12041, 12693, 26580, 42106. 
Cyprinidae Sikukia stejnegeri Smith, 1931 Fr native   12.00 cm TL male/unsexed  Known from the Chao Phraya, Mekong and Peninsular Thailand river systems (Ref. 26336) and Meklong basin (Ref. 43281); also from Pasak river (Sara Buri), Chai Nat and Kanchanaburi (Ref. 37773). Also Ref. 12041, 12693, 26580, 36654, 42106. 
Sillaginidae Sillago sihama (Fabricius, 1775) Fr, Br, M, Fi native  Chonsaikaeo (Thai), ช่อนทรายแก้ว (Thai)  31.00 cm SL male/unsexed  Known from Tha Chin river (Samut Sakhon), Chanthaburi, Phuket, Klong Wan (Prachuap Khiri Khan), Gulf of Thailand, Songkhla and Andaman Sea (Ref. 37773). Also Ref. 6205, 9987, 52823. 
Siluridae Silurichthys hasseltii Bleeker, 1858 Fr native   11.00 cm TL male/unsexed  Reported from Chanthaburi and Surat Thani (Ref. 37773). 
Siluridae Silurichthys phaiosoma (Bleeker, 1851) Fr native   15.00 cm SL male/unsexed  Known from Malay peninsula (Ref. 57235); also from Chanthaburi and Narathiwat (Ref. 37773). Also Ref. 36654. 
Siluridae Silurichthys schneideri Volz, 1904 Fr native   16.00 cm SL male/unsexed  Known from southern and south-eastern Thailand. Reported from Nakhon Si Thammarat, Chanthaburi, Trat, and Trang (Ref. 37773). Also Ref. 32835. 
Botiidae Sinibotia longiventralis (Yang & Chen, 1992) Fr native   10.55 cm SL male/unsexed  Found in the Mekong River (Ref. 26336). Also Ref. 43281. 
Bagridae Sperata seenghala (Sykes, 1839) Fr native   150 cm TL male/unsexed  Reported from Mae Hong Son (Ref. 37773). 
Osphronemidae Sphaerichthys osphromenoides Canestrini, 1860 Fr, Or questionable   6.00 cm TL male/unsexed  Possibly occurring in Toh Daeng Peat, but no specimens collected from here yet. 
Gobiidae Stigmatogobius pleurostigma (Bleeker, 1849) Fr, Br native   6.40 cm SL male/unsexed  Type locality of Vaimosa spilopleura: Chantabun, River, southeastern Thailand (Ref. 43716). 
Gobiidae Stigmatogobius sadanundio (Hamilton, 1822) Fr, Br native  Buchut (Thai), บู่จุด (Thai)  9.00 cm SL male/unsexed  Known from Bang Pakong river (Chachoengsao), Bangkok, Thai waters and Songkhla (Ref. 37773). Also Ref. 7050, 52823, 56945. 
Engraulidae Stolephorus baganensis Hardenberg, 1933 Fr, Fi native   10.00 cm NG male/unsexed  Known from Surat Thani (Ref. 37773). Also Ref. 189. 
Engraulidae Stolephorus chinensis (Günther, 1880) Fr, Br, M, Fi misidentification   9.00 cm SL male/unsexed  Outside distributional range (Ref. 128119). Reported from the Gulf of Thailand and Chanthaburi (Ref. 37773). Also Ref. 189, 52823. 
Engraulidae Stolephorus commersonnii Lacepède, 1803 Fr, Br, M, Fi native  Saitan (Thai), ไส้ตัน (Thai)  11.23 cm SL male/unsexed  Known from Bangkok, Paknam (Samut Prakan), and Chanthaburi Estuary (Ref. 1632); also from Klong Wan (Prachuap Khiri Khan), Songkhla, Phuket, Si Racha (Chon Buri), Gulf of Thailand and Chanthaburi (Ref. 37773). Also Ref. 189, 52823. 
Engraulidae Stolephorus dubiosus Wongratana, 1983 Fr, Br, M, Fi native   7.50 cm SL male/unsexed  Reported from Songkhla, Samut Sakhon, Samut Prakan, Nakhon Si Thammarat and Surat Thani (Ref. 37773). Also Ref. 189. 
Engraulidae Stolephorus indicus (van Hasselt, 1823) Fr, Br, M, Fi native  Katakyai (Thai), กะตักใหญ่ (Thai)  15.50 cm SL male/unsexed  Known from Chiengmai (Chiang Mai); Paknam (Samut Prakan); Bangkok; Laem Sing; Menam Chanthaburi; Songkhla; Bokha at Koh Samui (Ref. 1632); also from Klong Wan (Prachuap Khiri Khan), Ko Samui (Surat Thani), Trat, Chon Buri and Phuket (Ref. 37773). Also Ref. 189, 52823. 
Engraulidae Stolephorus insularis Hardenberg, 1933 Fr, Br, M, Fi native  Huapan (Thai), หัวป้าน (Thai)  8.00 cm SL male/unsexed  Reported from Chanthaburi and Songkhla (Ref. 37773). Also Ref. 189, 52823. 
Engraulidae Stolephorus tri (Bleeker, 1852) Fr, Br, M, Fi native   9.50 cm SL male/unsexed  Found in the Gulf of Thailand (Ref. 189) and the Chanthaburi Estuary (Ref. 1632); also from Surat Thani (Ref. 37773). 
Cyprinidae Striuntius lateristriga (Valenciennes, 1842) Fr native   18.60 cm TL male/unsexed  Known from Maeklong, Mekong and Peninsular Thailand river systems (Ref. 26336); also from Nakhon Si Thammarat, Chumphon, Songkhla, Trang and Surat Thani (Ref. 37773). Also Ref. 1632, 7020. 
Belonidae Strongylura leiura (Bleeker, 1850) Fr, Br, M native   100.00 cm TL male/unsexed  Reported from Songkhla, Samut Prakan and Klong Wan (Prachuap Khiri Khan) (Ref. 37773). 
Belonidae Strongylura strongylura (van Hasselt, 1823) Fr, Br, M native  Kathungkhwai (Thai), กะทุงควาย (Thai)  40.00 cm SL male/unsexed  Reported from Songkhla, Samut Prakan and Chon Buri (Ref. 37773). 
Ehiravidae Sundasalanx mekongensis Britz & Kottelat, 1999 Fr native   2.78 cm SL male/unsexed  Found in the Mekong basin. Also Ref. 43281.  No picture yet.
Ehiravidae Sundasalanx microps Roberts, 1981 Fr questionable   2.30 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 37773). Occurrence needs confirmation as this species is known from the Kapuas basin, Borneo (Ref. 27732). 
Ehiravidae Sundasalanx praecox Roberts, 1981 Fr native   2.25 cm SL male/unsexed  Known from Maeklong, Peninsular Thailand and Mekong river systems (Ref. 26336). Found in the Mekong River and tributaries from Ban Dan to Nakon Phanom and in the Khlong Falamee, Tale Sap near Songkhla (Ref. 34809); also from Pak Payoon (Phatthalung) (Ref. 37773). Tyle locality, Khlong Falamee, a swift muddy creek flowing into inner lake of Thale Sap, at about 2 km west of Pak Payoon (Ref. 94476). 
Botiidae Syncrossus beauforti (Smith, 1931) Fr native  Pla moo (English), ปลาหมู (Thai)  25.00 cm SL male/unsexed  Occurs in Nakhon Sritamarat (Nakhon Si Thammarat), Menam Mun (Ref. 1632), and Mae Khlong, Mae Nam Chao Praya and Mekong basins (Refs. 12041, 26580 and 27732). Found also in Peninsular Thailand river systems (Ref. 26336); also from Chiang Mai and Trang (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 36654. 
Botiidae Syncrossus berdmorei Blyth, 1860 Fr, Or native   15.00 cm NG male/unsexed  Known from Kanchanaburi and Surat Thani (Ref. 37773). 
Botiidae Syncrossus helodes (Sauvage, 1876) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong, Meklong and Chao Phraya basins (Ref. 27732). Found also in Peninsular Thailand river systems (Ref. 26336). Museum: Mekong, CAS 96708 (ca. 4 km downriver from Pak Ing, ca. 25 km downriver from Chiang Kong); CAS 96785 (near Chiang Sen); CAS 92434 (Huay Nam Ngam & Mekong mainstream near That Phanom); CAS 63022, 96874 (Chiang Khan) (Ref. 5515). Also Ref. 12693, 36654, 26580. 
Botiidae Syncrossus hymenophysa (Bleeker, 1852) Fr, Or misidentification  Pla moo (Thai), Pla moo kang lai (Thai), Pla moo lai (Thai), ปลาหมู (Thai), ปลาหมูข้างลาย (Thai), ปลาหมูลาย (Thai), Banded loach (English)  21.00 cm SL male/unsexed  Occurs in Chiengmai (Chiang Mai) and Menam Chao Phya (Chao Phraya) (Ref. 1632). Found in Mekong River and its tributaries (Ref. 9648); also from Nong Khai, Nakhon Phanom, Mae Hong Son, Phrae, Phitsanulok, Nakhon Sawan, Phra Nakhon Si Ayutthaya, Ratchaburi, Kanchanaburi, Nonthaburi, Phetchaburi, Prachin Buri and Surat Thani (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 7020. Misidentification of Botia helodes (Ref. 26336, 27732). 
Cyprinidae Systomus jacobusboehlkei (Fowler, 1958) Fr native   12.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basin. Also Ref. 43281. 
Cyprinidae Systomus rubripinnis (Valenciennes, 1842) Fr, Fi, Or native  Pla khao sa-mhor mook (Thai), Pla hae sa mao (Thai), Pla hang daeng (Thai), Pla hang deng (Thai), Pla hua sa-mhor (Thai), Pla kaem cham (Thai), Pla kam cham (Thai), Pla khao sa mao mok (Thai), Pla la bok (Thai), Pla mok (Thai), Pla mook (Thai), Pla pok (Thai), Pla pok som (Thai), Pla sa mao sok (Thai), Pla sa pok (Thai), Pla sa-mhor sook (Thai), ปลาขาวสมอมุก (Thai), ปลาซ่าปก (Thai), ปลาปก (Thai), ปลาปกส้ม (Thai), ปลามุก (Thai), ปลาลาบก (Thai), ปลาสมอสุก (Thai), ปลาหัวสมอ (Thai), ปลาหางแดง (Thai), ปลาแก้มช้ำ (Thai), Red cheek barb (English)  25.00 cm SL male/unsexed  Found in Mekong, Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336) and Mae Khlong basin (Ref. 26580); also from Chiang Mai and Sakon Nakhon (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 2059, 9648, 36654, 41236, 43281. 
Cyprinidae Systomus sarana (Hamilton, 1822) Fr, Fi native  Tapien (Thai)  42.00 cm TL male/unsexed  Found in Mekong River and its tributaries. Also known from Mae Wong (Nakhon Sawan) (Ref. 37773). Also Ref. 1632. 
Bagridae Tachysurus nudiceps (Sauvage, 1883) Fr questionable   15.00 cm TL male/unsexed  Reported from Chao Phraya river (Ref. 37773). Outside distributional range, occurrence needs verification.  No picture yet.
Gobiidae Taenioides anguillaris (Linnaeus, 1758) Fr, Br, M native   40.00 cm TL male/unsexed  Reported from Bangkok, Paknam (Samut Prakan), Bang Torani (Nonthaburi), Klong Wan (Prachuap Khiri Khan) and Bang Kaen (Bangkok) (Ref. 37773). 
Gobiidae Taenioides gracilis (Valenciennes, 1837) Fr, Br native   30.00 cm TL male/unsexed  Reported from Paknam (Samut Prakan) and Songkhla (Ref. 37773). 
Gobiidae Taenioides nigrimarginatus Hora, 1924 Fr native   23.00 cm TL male/unsexed  Known from the Malay Peninsula (Ref. 12693); also from Songkhla (Ref. 37773). 
Cyprinidae Tariqilabeo bicornis (Wu, 1977) Fr native   16.00 cm TL male/unsexed  Known from the upper Salween River (Nu Jiang) (Ref. 83319). 
Dorosomatidae Tenualosa macrura (Bleeker, 1852) Fr, Br, M, Thr native  Longtail shad (English)  52.00 cm SL male/unsexed  Known from Prachuap Khiri Khan and Si Racha (Chon Buri) (Ref. 37773). Threatened due to habitat loss (Ref. 58784). Also Ref. 7050. Status of threat: Endangered (Ref. 58784). 
Dorosomatidae Tenualosa reevesii (Richardson, 1846) Fr, Br, M, Fi native   61.60 cm TL male/unsexed  Also Ref. 188. 
Dorosomatidae Tenualosa thibaudeaui (Durand, 1940) Fr, Br, Fi, Thr native  Laotian shad (English) scarce (very unlikely) 30.00 cm SL male/unsexed  Known from the Mekong River (Ref. 58784). Reported from Thale Sap (Ref. 1632); and Sakon Nakhon, Mukda Han, Ubon Ratchathani (Ref. 37773). Threatened due to overfishing and habitat loss (Ref. 58784). Museum: Mekong river, Nongkai province, Thailand, BMNH 1979.5.24.11 (Ref. 31982); Huay Nam Ngam and Mekong mainstream near That Phanom, CAS 96986 (Ref. 5515). Also Ref. 188, 12693, 26336, 37770, 43281. Status of threat: Endangered (Ref. 58784). 
Dorosomatidae Tenualosa toli (Valenciennes, 1847) Fr, Br, M, Fi, Thr native  Toli shad (English)  60.00 cm TL male/unsexed  Known from Menam Chao Phya (Chao Phraya); Gulf of Thailand, off Samud Prakan; and Thale Sap, Songkhla (Ref. 1632). Threatened due to habitat loss and overfishing (Ref. 58784). Also Ref. 188. Status of threat: Endangered (Ref. 58784). 
Tetraodontidae Tetraodon barbatus Roberts, 1998 Fr native   13.62 cm SL male/unsexed  Known from the Mekong River (Ref. 95519).  No picture yet.
Engraulidae Thryssa hamiltonii (Gray, 1835) Fr, Br, M, Fi native  Maeo (Thai), Popi (Thai), ป้อปี้ (Thai), แมว (Thai)  27.00 cm SL male/unsexed  Occurs in the the Gulf of Thailand, off Cham Han Bight, Samut Prakan, Laem Sing, Tha-chalom, Mae-klong, and Bokha at Koh Samui; Tapi River, below Bandon; Chanthaburi Estuary (Ref. 1632); also from Klong Wan (Prachuap Khiri Khan) (Ref. 37773). Also Ref. 189, 52823. 
Danionidae Thryssocypris wongrati Grudpan & Grudpan, 2012 Fr native   5.22 cm SL male/unsexed  Known from the Chao Phraya basin. In the lower part of the Chao Phraya Basin, it has been recorded from irrigation canals in Sing-Buri up to the most northern part of the basin in Nan River, Phitsanulok. In the upper part of Chao Phraya basin, it is found in floodplain habitats, irrigation canals, and the river mainstem (Ref. 93051).  No picture yet.
Cyprinidae Thynnichthys thynnoides (Bleeker, 1852) Fr native  Pla kled thee (Thai), Pla i gun la mok (Thai), Pla kled tee (Thai), Pla ling (Thai), Pla nang jan (Thai), Pla nang jun (Thai), Pla nang kled (Thai), Pla naun jan (Thai), Pla naun jun (Thai), Pla prom (Thai), ปลานวลจันทร์ (Thai), ปลานางจันทร์ (Thai), ปลานางเกล็ด (Thai), ปลาพรม (Thai), ปลาลิง (Thai), ปลาอิกันลามอก (Thai), ปลาเกล็ดถี่ (Thai)  25.00 cm TL male/unsexed  Occurs in Mekong River and its tributaries (Ref. 9648, 26336), Maeklong, Chao Phraya and Peninsular Thailand river systems (Ref. 26336); also from Nonthaburi, Pattani, Phitsanulok, Phra Nakhon Si Ayutthaya, Yala, Prachin Buri, Nakhon Sawan, Ubon Ratchathani and Surat Thani (Ref. 37773). Also Ref. 26580, 36654. 
Cyprinidae Tor douronensis (Valenciennes, 1842) Fr, Fi native  Pla wien (Thai)  35.00 cm TL male/unsexed  Known from Peninsular Thailand, Chao Phraya and Mekong basins. Also recorded from Si Sawat (Kanchanaburi), Pattani river and Mekhan (Chiang Mai) (Ref. 37773). Also Ref. 1632, 7050. 
Cyprinidae Tor sinensis Wu, 1977 Fr questionable   46.50 cm SL male/unsexed  Occurs in the Mekong River (Ref. 26336). Not recorded by Pinder et al., 2019 (Ref. 123468). 
Cyprinidae Tor tambra (Valenciennes, 1842) Fr native   100.00 cm TL male/unsexed  Known from the Mekong basin. 
Cyprinidae Tor tambroides (Bleeker, 1854) Fr native  Pla wien (Thai), Greater brook carp (English), Pla wien (Thai)  100.00 cm SL male/unsexed  Occurs in Peninsular Thailand, Mekong, Chao Phraya, Salween and Maeklong basins (Ref. 26336); also from Phetchaburi, Chiang Mai, Uthai Thani, Kanchanaburi and Surat Thani (Ref. 37773). Taken mostly by hooks baited with dough-balls of rice flour mixed with sugar palm fruit (Ref. 12693). Also Ref. 1632, 27732, 26580. 
Toxotidae Toxotes chatareus (Hamilton, 1822) Fr, Fi native  Pla seua (Thai), Pla seua pon nam (Thai), ปลาเสือ (Thai), ปลาเสือพ่นน้ำ (Thai)  40.00 cm SL male/unsexed  Found in Mekong River and its tributaries (Ref. 9648), Chao Phraya, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Tale Sap Songkhla, Krabi, Phatthalung, Bandon (Surat Thani), Bang Pakong river (Chachoengsao), Nonthaburi, Ratchaburi and Phra Nakhon Si Ayutthaya (Ref. 37773). Also Ref. 36654. 
Toxotidae Toxotes jaculatrix (Pallas, 1767) Fr, Br, Or native  Sueaphonnam (Thai), เสือพ่นน้ำ (Thai)  30.00 cm TL male/unsexed  Known from Chanthaburi, Phuket, Thai waters and Chai Nat (Ref. 37773). Also Ref. 4833, 52823. 
Toxotidae Toxotes microlepis Günther, 1860 Fr native   15.00 cm SL male/unsexed  Occurs in the Mekong and Chao Phraya basins. Also known from Bangkok, Nonthaburi, Hangkaben (Phra Nakhon Si Ayutthaya), Nakhon Nayok and Nakhon Sawan (Ref. 37773). Also Ref. 27732. 
Synanceiidae Trachicephalus uranoscopus (Bloch & Schneider, 1801) Fr, Br, M native   10.00 cm TL male/unsexed  Reported from Lem Sing (Chanthaburi) and Songkhla (Ref. 37773). East Andaman Sea area (Ref. 90102). Also Ref. 39597. 
Osphronemidae Trichopodus leerii (Bleeker, 1852) Fr, Or native  Pearl gourami (English)  12.00 cm TL male/unsexed  Known from Bangkok and Prachuap Khiri Khan (Ref. 37773). Inhabits lowland swamps with acidic water (Ref. 57235). Reared in captivity for the ornamental fish trade (Ref. 6459). Also Ref. 1739, 2091. 
Osphronemidae Trichopodus microlepis (Günther, 1861) Fr, Fi, Or native  Pla kra di nang (Thai), ปลากระดี่นาง (Thai)  14.00 cm TL male/unsexed  Naturally found in the Chao Phraya basin (Ref. 43281). Introduced in the Mekong basin (Ref. 43281). Recorded also from the Maeklong basin (Ref. 26336); also from Bangkok, Tha Chin river (Samut Sakhon), Mepoon (Phrae), Phra Nakhon Si Ayutthaya, Songkhla and Nakhon Sawan (Ref. 37773). Reared in captivity for the ornamental fish trade (Ref. 6459). Also Ref. 9648, 1739, 36654, 94476. 
Osphronemidae Trichopodus pectoralis Regan, 1910 Fr, Fi, Aq, Or native  Pla sa-lid (Thai), Pla bai mai (Thai), Pla salid (Thai), ปลาสลิด (Thai), ปลาใบไม้ (Thai), Siamese gourami (English)  25.00 cm TL male/unsexed  Naturally found in Mekong and Chao Phraya basins (Ref. 43281). Recorded from Maeklong and Southeast Thailand river systems (Ref. 26336); also from Klong Kok Kamyan (Suphanburi), Bangkok, Bung Borapet (Nakhon Sawan), Chai Nat and Songkhla (Ref. 37773). Naturally absent from Peninsular, Northern, and Western Thailand. Flesh of good quality; usually prepared by air drying. Reared in captivity for the ornamental fish trade (Ref. 6459). Also Ref. 2686, 7306, 9648, 9987, 36654.. 
Osphronemidae Trichopodus trichopterus (Pallas, 1770) Fr, Fi native  Pla sa-lang (Thai), Pla ka di (Thai), Pla ka di mor (Thai), Pla kra di (Thai), Pla kra di mhor (Thai), Pla sa lak (Thai), Pla sa lang (Thai), Pla sa-lak (Thai), ปลากระดี่ (Thai), ปลากระดี่หม้อ (Thai), ปลาสลาก (Thai), ปลาสลาง (Thai)  15.00 cm SL male/unsexed  Found in Mekong, Chao Phraya, Maeklong, Salween, Peninsular and Southeast Thailand river systems (Ref. 26336). In Chiang Khong and Nong Khai Provinces, it is uncommon in the Mekong River, but common in small streams and canals (Ref. 37770). At Mukdahan, it migrates from the Mekong River into its tributaries (Ref. 37770). Museum: Mekong mainstream between Pak Ing and Jom Paeng (about 4-5 km downstream), CAS 96774 (Ref. 5515); also from Tale Sap Songkhla, Bangkok, Metang (Chiang Mai), Mepoon (Phrae), Phitsanulok, Rayong, Phra Nakhon Si Ayutthaya, Uthai Thani and Bung Borapet (Nakhon Sawan) (Ref. 37773). Also Ref. 9648, 36654, 57235. 
Osphronemidae Trichopsis pumila (Arnold, 1936) Fr, Or native  Rainbow gourami (English)  4.00 cm SL male/unsexed  Known from Mekong, Chao Phraya and Peninsular Thailand river systems (Ref. 26336); also from Nakhon Sawan, Sakon Nakhon and Chanthaburi (Ref. 37773). Captured from the wild and reared in captivity for the ornamental fish trade (Ref. 6459, 57235). Also Ref. 36654. 
Osphronemidae Trichopsis schalleri Ladiges, 1962 Fr, Or native  Three striped croaking (English)  5.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 26336, 27732); also from Sakon Nakhon and Nakhon Sawan (Ref. 37773). Captured from the wild and reared in captivity for the ornamental fish trade (Ref. 6459). Also Ref. 43281. 
Osphronemidae Trichopsis vittata (Cuvier, 1831) Fr, Or native  Pla kad pa (Thai), Pla krim (Thai), ปลากริม (Thai), ปลากัดป่า (Thai), Croaking gourami (English)  8.00 cm TL male/unsexed  Found in Mekong, Chao Phraya, Salween, Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336); also from Mepoon (Phrae), Nonthaburi, Nakhon Si Thammarat, Ban Ang (Chanthaburi), Sikuk river (Phra Nakhon Si Ayutthaya), Khon Kaen, Songkhla and Uthai Thani (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Also Ref. 9648, 36654. 
Danionidae Trigonopoma pauciperforatum (Weber & de Beaufort, 1916) Fr native   7.00 cm TL male/unsexed  Occurs in southeastern Thailand (Ref. 26580). Known from Kanthuli and the Toh Daeng Peats (Ref. 57235); also from Narathiwat and Pattani (Ref. 37773). 
Danionidae Trigonostigma espei (Meinken, 1967) Fr native   2.50 cm SL male/unsexed  Occurs in the southeastern Thailand (Ref. 38434). Also Ref. 13371. 
Danionidae Trigonostigma hengeli (Meinken, 1956) Fr questionable   3.00 cm SL male/unsexed  Record from Ref. 4537. Occurrence outside distributional range (Ref. 38434). 
Danionidae Trigonostigma heteromorpha (Duncker, 1904) Fr, Or questionable   5.00 cm TL male/unsexed  Outside distributional range, might be referring to another species (see Ref. 122370). Occurs in Tale Sap, Inner lake; and Chanthaburi, mountain spring at Ban Ang. Known from Toh Daeng Peat, Thailand (Ref. 57235); also from Songkhla (Ref. 37773). Also Ref. 1632, 4537, 38434. 
Danionidae Trigonostigma somphongsi (Meinken, 1958) Fr, Thr endemic   10.50 cm TL male/unsexed  Known from Mae Khlong basin. Also recorded from Ratchaburi (Ref. 37773). Threatened due to habitat loss (Ref. 58784). Also Ref. 3881, 26580, 38434. Status of threat: Critically Endangered (Ref. 58784). 
Danionidae Trigonostigma truncata Tan, 2020 Fr native   2.51 cm SL male/unsexed  Type locality of Trigonostigma truncata, Narathiwat Province, stream along road branching West at about 7 km on road from Waeng to Ban Bu Ke Ta. Associated species collected from Mae Nam Tod Deng swamp forest in South Thailand include the following: Notopterus notopterus (Notopteridae), Boraras urophthalmoides, Trigonopoma gracile (Danionidae), Kryptopterus minor (Siluridae), Clarias meladerma (Clariidae), Monopterus javanensis (Synbranchidae), Chaudhuria sp. (Chaudhuriidae), Oryzias minutulatus (Adrianichthyidae), Indostomus crocodilus (Indostomidae), Betta imbellis, B. pi, Parosphromenus paludicola, Trichopodus trichopterus, Trichopsis vittata (Osphronemidae), Channa limbata, and C. lucius (Channidae). (Ref. 122370).  No picture yet.
Nemacheilidae Tuberoschistura baenzigeri (Kottelat, 1983) Fr native   4.20 cm SL male/unsexed  Known from the Chao Phraya basin (Ref. 26580) and Peninsular Thailand (Ref. 39226). Found in the Mae Nam Ping basin of the Chao Phraya in Chiang Mai Province (Ref. 39226) and the Maeklong river (Ref. 78705). 
Belonidae Tylosurus crocodilus (Péron & Lesueur, 1821) Fr, Br, M native  Kathungheoyai (Thai), กะทุงเหวใหญ่ (Thai)  150 cm TL male/unsexed  Reported from Samut Prakan, Chon Buri and Songkhla (Ref. 37773). 
Dasyatidae Urogymnus polylepis (Bleeker, 1852) Fr, Fi, Sp, Thr native  Giant stingray (English)  240 cm WD male/unsexed  Occrus in the Mekong and Chao Phraya basins (Ref. 27732), as well as the Nan, Tachin, Bangpakong, Tapi and Mun (Ref. 32457) and Maeklong (Ref. 26336); also from Chai Nat, Sing Buri, Nakhon Sawan and Phichit (Ref. 37773). Popular game fish (Ref. 32457). Might be considered a protected species in the near future by the IUCN (Compagno pers. Comm.). Threatened due to overfishing (Ref. 58784). Also Ref. 6871, 9840, 32444, 43281, 75154. Status of threat: Endangered (Ref. 58784). Status of threat: Threatened (Ref. 36508). 
Gobiidae Valenciennea muralis (Valenciennes, 1837) Fr, Br, M native   16.00 cm SL male/unsexed  Reported from Chanthaburi, Ko Chang (Trat) and Songkhla (Ref. 37773). Museum: Gulf of Koh Chang, USNM 119651. Butang Islands, USNM 265769. Also Ref. 8527. 
Siluridae Wallago attu (Bloch & Schneider, 1801) Fr, Fi native  Pla khao (Thai), ปลาเค้า (Thai)  240 cm TL male/unsexed  Found in larger Thailand streams (Ref. 1632). Occurs in Mekong River and its tributaries (Ref. 9648); Maekok at Chiang Rai and the Chao Phraya River (Ref. 1632); river systems of Peninsular Thailand, Salween and Maeklong (Ref. 26336). Observed to breed in Huai Kid reservoir near the mouth of the Huai Kid stream in Loei Province (Ref. 37770); also from Bangkok, Chiang Mai, Nakhon Sawan, Nonthaburi, Krabi, Phra Nakhon Si Ayutthaya and Ubon Ratchathani (Ref. 37773). Also Ref. 4833, 37772, 37773, 43281, 43640. 
Siluridae Wallago leerii Bleeker, 1851 Fr native   150 cm TL male/unsexed  Known from the river systems of Peninsular Thailand, Maeklong and Chao Phraya (Ref. 26336). Also Ref. 12455. 
Siluridae Wallago micropogon Ng, 2004 Fr, Fi native   154 cm SL male/unsexed  Known from the middle Chao Phraya River drainage in central Thailand (Ref. 51260). Found in the Mekong where it is reported to migrate downstream in October-November (Ref. 37770). Migrates into smaller streams to spawn (Ref. 37770). Normally occurs in small Mekong tributaries when the water level starts to rise, especially after strong rain (Ref. 37770). Also Ref. 12455, 37772. 
Belonidae Xenentodon cancila (Hamilton, 1822) Fr, Fi native  Pla katung heow mueng (Thai), Pla katung heo (Thai), Pla katung heo mueng (Thai), Pla katung heow (Thai), ปลากะทุงเหว (Thai), ปลากะทุงเหวเมือง (Thai)  40.00 cm TL male/unsexed  Inhabits streams to lowland wetlands and rivers throughout the country (Ref. 57235). Found in Mekong River and its tributaries (Ref. 9648); reported from Songkhla, Bangkok, Klong Sok (Surat Thani), Phra Nakhon Si Ayutthaya, Nakhon Sawan, Kanchanaburi, Ubon Ratchathani, and Uthai Thani (Ref. 37773). Also Ref. 4833, 41236, 43640. 
Belonidae Xenentodon canciloides (Bleeker, 1854) Fr native   30.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281) and Bangkok (Ref. 37773). Also Ref. 12693. 
Botiidae Yasuhikotakia caudipunctata (Taki & Doi, 1995) Fr native   9.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 27732, 37773, 26580. 
Botiidae Yasuhikotakia eos (Taki, 1972) Fr native   11.00 cm TL male/unsexed  Occurs in the Mekong (Ref. 27732), Chao Phraya and Maeklong basins (Ref. 26336). Museum: Mekong river at Chiang Khan, CAS 63026 (Ref. 5515); also from Khon Kaen, Ubon Ratchathani and Ratchaburi (Ref. 37773). 
Botiidae Yasuhikotakia lecontei (Fowler, 1937) Fr, Or native  Pla moo (Thai), ปลาหมู (Thai), Red tailed loach (English)  15.00 cm SL male/unsexed  Found in Mekong and Chao Phraya basins (Ref. 26336). Captured from the wild for the ornamental fish trade (Ref. 6459). Museum: Ban Kok, Wang Sam Mo, Udon Thani, NSMT-P 35926. Haad Sang Tien, ubon Ratchathani, NSMT-P 35927. Market at Ubon Ratchathani, NSMT-P 35929. Mekong River at Hatsalao, near Pakse, IBRP 5273 (Ref. 13469). Museum: Mekong river at Chiang Khan, CAS 63025 (Ref. 5515); also from Nakhon Phanom and Nong Khai (Ref. 37773). Also Ref. 1632, 9648, 27732. 
Botiidae Yasuhikotakia longidorsalis (Taki & Doi, 1995) Fr native   8.00 cm SL male/unsexed  Known from the Mekong River. Also Ref. 37773, 43281. 
Botiidae Yasuhikotakia modesta (Bleeker, 1864) Fr, Or native  Pla moo (Thai), Pla moo khao (Thai), Pla moo khaw (Thai), Pla moo lueng (Thai), Pla moo man (Thai), ปลาหมู (Thai), ปลาหมูขาว (Thai), ปลาหมูมัน (Thai), ปลาหมูเหลือง (Thai), Yellow tailed loach (English)  25.00 cm SL male/unsexed  Occurs in Pitsanulok (Phitsanulok); Menam Chao Phya (Chao Phraya); Bangpakong River (Ref. 1632) and Mae Khlong basin (Ref. 12041). Also found in the Mekong (Ref. 9648, 27732) and Peninsular Thailand river systems (Ref. 26336). Captured from the wild for the ornamental fish trade (Ref. 6459). Juveniles around 2 cm appear from March to May and again from September to November at Chiang Khong and Chiang Saen and November at Mukdahan (Ref. 37770). Museum: Tahat Thai Khum Market, Chainat, NSMT-P 35928. Bung Boraphet Channel, in front of Nakhon Sawan Fish. Stn., Nakhon Sawan, NSMT-P 35932. Market at Ubon Ratchathani, NSMT-P 35934 (Ref. 13469). Museum: Mekong at Chiang Khan, CAS 63023 (Ref. 5515); also from Kanchanaburi, Khon Kaen, Nong Khai, Ratchaburi, Phra Nakhon Si Ayutthaya, Uttaradit, Nonthaburi, Chiang Mai, Udon Thani and Prachin Buri (Ref. 37773). Also Ref. 4537, 7020, 36654, 26580. 
Botiidae Yasuhikotakia morleti (Tirant, 1885) Fr, Or native  Hora's loach (English)  10.00 cm TL male/unsexed  Known from Mae Khlong, Mae Nam Chao Praya (Ref. 12041), Mekong and Peninsular Thailand river systems (Ref. 26336). Reported from Chiang Mai, Mae Hong Son, Surat Thani, Khon Kaen, and Surin (Ref. 37773). Captured from the wild for the ornamental fish trade (Ref. 6459). Museum: Ban Kok, Wang Sam Mo, Udon Thani, NSMT-P 35930. Sirin Thon Dam, Bun Tharik, Ubon Ratchathani, NSMT-P 35931. Thapoon Dam, Mun River at Tha Chang, Khorat, NSMT-P 35933 (Ref. 13469). Also Ref. 1632, 4537, 7020, 26580. 
Zenarchopteridae Zenarchopterus dispar (Valenciennes, 1847) Fr, Br native   19.00 cm TL male/unsexed  Recorded from Si Racha (Chon Buri) (Ref. 37773). Found in rivers, estuaries and mangroves. Also Ref. 43081. 
Zenarchopteridae Zenarchopterus ectuntio (Hamilton, 1822) Fr native   18.00 cm TL male/unsexed  Known from Trat, Nonthaburi, Samut Prakan, Bang Pakong river (Chachoengsao), Tale Sap Songkhla and Chanthaburi (Ref. 37773). Also Ref. 4833, 7050. 
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