| Order | Family | Species | Occurrence | FishBase name | Name in Country |
|---|---|---|---|---|---|
| Pleuronectiformes | Achiridae | Achirus mazatlanus | native | Mazatlan sole | |
| Cyprinodontiformes | Poeciliidae | Alfaro huberi | native | Hubers knife livebearer | |
| Cichliformes | Cichlidae | Amatitlania nigrofasciata | native | Convict cichlid | Serica |
| Cichliformes | Cichlidae | Amphilophus trimaculatus | native | Three spot cichlid | |
| Cyprinodontiformes | Anablepidae | Anableps dowii | native | Pacific foureyed fish | |
| Clupeiformes | Engraulidae | Anchoa belizensis | native | Belize anchovy | |
| Clupeiformes | Engraulidae | Anchoa curta | native | Short anchovy | |
| Clupeiformes | Engraulidae | Anchoa parva | native | Little anchovy | |
| Anguilliformes | Anguillidae | Anguilla rostrata | native | American eel | |
| Eupercaria/misc | Sciaenidae | Aplodinotus grunniens | native | Freshwater drum | |
| Siluriformes | Ariidae | Ariopsis assimilis | native | Mayan sea catfish | |
| Siluriformes | Ariidae | Ariopsis seemanni | native | Tete sea catfish | |
| Cichliformes | Cichlidae | Astatheros macracanthus | native | Blackthroat cichlid | |
| Characiformes | Characidae | Astyanax aeneus | native | Banded tetra | |
| Characiformes | Characidae | Astyanax bacalarensis | native | ||
| Characiformes | Characidae | Astyanax baileyi | native | ||
| Characiformes | Characidae | Astyanax belizianus | native | Belizean tetra | |
| Characiformes | Characidae | Astyanax brevimanus | native | Quiché tetra | |
| Characiformes | Characidae | Astyanax cubilhuitz | native | Cubilhuitz tetra | |
| Characiformes | Characidae | Astyanax dorioni | native | ||
| Characiformes | Characidae | Astyanax petenensis | native | Petén tetra | Sardinita del Petén |
| Atheriniformes | Atherinopsidae | Atherinella argentea | native | Moon silverside | |
| Atheriniformes | Atherinopsidae | Atherinella guatemalensis | native | Guatemala silverside | |
| Atheriniformes | Atherinopsidae | Atherinella guija | native | ||
| Atheriniformes | Atherinopsidae | Atherinella meeki | native | ||
| Lepisosteiformes | Lepisosteidae | Atractosteus tropicus | native | Tropical gar | |
| Gobiiformes | Gobiidae | Awaous banana | native | River goby | |
| Batrachoidiformes | Batrachoididae | Batrachoides goldmani | native | Mexican freshwater toadfish | |
| Batrachoidiformes | Batrachoididae | Batrachoides waltersi | native | Walter's toadfish | |
| Cyprinodontiformes | Poeciliidae | Belonesox belizanus | native | Top minnow | |
| Cyprinodontiformes | Poeciliidae | Brachyrhaphis hartwegi | native | Soconusco gambusia | |
| Characiformes | Bryconidae | Brycon guatemalensis | native | Machaca | |
| Carcharhiniformes | Carcharhinidae | Carcharhinus leucas | native | Bull shark | |
| Cyprinodontiformes | Poeciliidae | Carlhubbsia kidderi | native | Champoton gambusia | |
| Cyprinodontiformes | Poeciliidae | Carlhubbsia stuarti | native | Barred livebearer | |
| Siluriformes | Ariidae | Cathorops aguadulce | native | Estuarine sea catfish | |
| Siluriformes | Ariidae | Cathorops fuerthii | native | Congo sea catfish | |
| Siluriformes | Ariidae | Cathorops kailolae | native | Papillate sea catfish | Bagre de Kailola |
| Siluriformes | Ariidae | Cathorops melanopus | native | Dark sea catfish | |
| Siluriformes | Ariidae | Cathorops steindachneri | native | Steindachner's sea catfish | |
| Carangaria/misc | Centropomidae | Centropomus ensiferus | native | Swordspine snook | |
| Carangaria/misc | Centropomidae | Centropomus nigrescens | native | Black snook | |
| Carangaria/misc | Centropomidae | Centropomus parallelus | native | Fat snook | |
| Carangaria/misc | Centropomidae | Centropomus pectinatus | native | Tarpon snook | |
| Cichliformes | Cichlidae | Chiapaheros grammodes | native | ||
| Cichliformes | Cichlidae | Chuco godmanni | native | Southern checkmark cichlid | |
| Cichliformes | Cichlidae | Chuco intermedium | native | Northern checkmark cichlid | |
| Cichliformes | Cichlidae | Chuco microphthalmus | native | ||
| Cichliformes | Cichlidae | Cincelichthys bocourti | native | Chisel-tooth cichlid | |
| Cichliformes | Cichlidae | Cincelichthys pearsei | native | Pantano cichlid | |
| Pleuronectiformes | Cyclopsettidae | Citharichthys gilberti | native | Bigmouth sanddab | |
| Cichliformes | Cichlidae | Cribroheros longimanus | native | Red breast cichlid | Viejito |
| Cichliformes | Cichlidae | Cribroheros robertsoni | native | False firemouth cichlid | |
| Cichliformes | Cichlidae | Cryptoheros cutteri | native | ||
| Cichliformes | Cichlidae | Cryptoheros spilurus | native | Blue-eye cichlid | |
| Gobiiformes | Gobiidae | Ctenogobius claytonii | native | Mexican goby | |
| Cyprinodontiformes | Rivulidae | Cynodonichthys godmani | native | ||
| Cyprinodontiformes | Rivulidae | Cynodonichthys tenuis | native | Dogtooth rivulus | |
| Cypriniformes | Cyprinidae | Cyprinus carpio | introduced | Common carp | |
| Mugiliformes | Mugilidae | Dajaus monticola | native | Mountain mullet | |
| Gobiiformes | Eleotridae | Dormitator latifrons | native | Pacific fat sleeper | |
| Gobiiformes | Eleotridae | Dormitator maculatus | native | Fat sleeper | |
| Clupeiformes | Dorosomatidae | Dorosoma anale | native | Mexican river gizzard shad | |
| Clupeiformes | Dorosomatidae | Dorosoma petenense | native | Threadfin shad | |
| Gobiiformes | Eleotridae | Eleotris picta | native | Spotted sleeper | |
| Gobiiformes | Eleotridae | Eleotris pisonis | native | Spinycheek sleeper | |
| Eupercaria/misc | Gerreidae | Eucinostomus currani | native | Pacific flagfin mojarra | |
| Eupercaria/misc | Gerreidae | Eucinostomus gracilis | native | Graceful mojarra | |
| Eupercaria/misc | Gerreidae | Eugerres mexicanus | native | ||
| Eupercaria/misc | Gerreidae | Eugerres plumieri | native | Striped mojarra | |
| Cyprinodontiformes | Poeciliidae | Gambusia luma | native | Sleek mosquitofish | |
| Cyprinodontiformes | Poeciliidae | Gambusia nicaraguensis | native | Nicaraguan mosquitofish | |
| Cyprinodontiformes | Poeciliidae | Gambusia sexradiata | native | Teardrop mosquito | |
| Cyprinodontiformes | Poeciliidae | Gambusia yucatana | native | Yucatan gambusia | |
| Eupercaria/misc | Gerreidae | Gerres cinereus | native | Yellow fin mojarra | |
| Gobiiformes | Eleotridae | Gobiomorus dormitor | native | Bigmouth sleeper | |
| Gobiiformes | Eleotridae | Gobiomorus maculatus | native | Pacific sleeper | |
| Gymnotiformes | Gymnotidae | Gymnotus carapo | native | Banded knifefish | |
| Gymnotiformes | Gymnotidae | Gymnotus cylindricus | native | ||
| Gymnotiformes | Gymnotidae | Gymnotus maculosus | native | Spotted knifefish | |
| Cyprinodontiformes | Poeciliidae | Heterandria attenuata | endemic | Yalicar toothcarp | |
| Characiformes | Characidae | Hyphessobrycon milleri | native | ||
| Beloniformes | Hemiramphidae | Hyporhamphus mexicanus | native | Mexican halfbeak | |
| Siluriformes | Ictaluridae | Ictalurus meridionalis | native | Southern blue catfish | |
| Cypriniformes | Catostomidae | Ictiobus meridionalis | native | Usumacinta buffalo | |
| Mugiliformes | Mugilidae | Joturus pichardi | native | Bobo mullet | |
| Cichliformes | Cichlidae | Kihnichthys ufermanni | native | Usumacinta cichlid | |
| Centrarchiformes | Kuhliidae | Kuhlia mugil | native | Barred flagtail | |
| Centrarchiformes | Centrarchidae | Lepomis gibbosus | introduced | Pumpkinseed | |
| Gobiiformes | Eleotridae | Leptophilypnus guatemalensis | native | ||
| Clupeiformes | Dorosomatidae | Lile stolifera | native | Striped herring | |
| Cichliformes | Cichlidae | Mayaheros trispilus | native | ||
| Cichliformes | Cichlidae | Mayaheros urophthalmus | native | Mexican mojarra | |
| Syngnathiformes | Syngnathidae | Microphis lineatus | native | Opossum pipefish | |
| Centrarchiformes | Centrarchidae | Micropterus salmoides | introduced | Largemouth black bass | |
| Mugiliformes | Mugilidae | Mugil cephalus | native | Flathead grey mullet | |
| Mugiliformes | Mugilidae | Mugil curema | native | White mullet | |
| Carangiformes | Carangidae | Oligoplites palometa | native | Maracaibo leatherjacket | |
| Carangiformes | Carangidae | Oligoplites saurus | native | Leatherjacket | |
| Synbranchiformes | Synbranchidae | Ophisternon aenigmaticum | native | Obscure swamp eel | |
| Cichliformes | Cichlidae | Oreochromis aureus | introduced | Blue tilapia | |
| Cichliformes | Cichlidae | Oreochromis mossambicus | introduced | Mozambique tilapia | |
| Cichliformes | Cichlidae | Oreochromis niloticus | introduced | Nile tilapia | |
| Cichliformes | Cichlidae | Oscura heterospila | native | Montecristo cichlid | |
| Cichliformes | Cichlidae | Parachromis friedrichsthalii | native | Yellowjacket cichlid | |
| Cichliformes | Cichlidae | Parachromis loisellei | native | Guapote amarillo | |
| Cichliformes | Cichlidae | Parachromis managuensis | introduced | Jaguar guapote | |
| Cichliformes | Cichlidae | Parachromis motaguensis | native | False yellowjacket cichlid | |
| Cichliformes | Cichlidae | Petenia splendida | native | Bay snook | |
| Cyprinodontiformes | Poeciliidae | Phallichthys amates | native | Merry widow livebearer | |
| Cyprinodontiformes | Poeciliidae | Phallichthys fairweatheri | native | Picotee livebearer | |
| Cyprinodontiformes | Poeciliidae | Poecilia butleri | native | Pacific molly | |
| Cyprinodontiformes | Poeciliidae | Poecilia kykesis | native | Usumacinta molly | |
| Cyprinodontiformes | Poeciliidae | Poecilia mexicana | native | Shortfin molly | |
| Cyprinodontiformes | Poeciliidae | Poecilia petenensis | endemic | Peten molly | |
| Cyprinodontiformes | Poeciliidae | Poecilia rositae | native | Lanquín toothcarp | |
| Cyprinodontiformes | Poeciliidae | Poeciliopsis gracilis | native | Porthole livebearer | |
| Cyprinodontiformes | Poeciliidae | Poeciliopsis pleurospilus | native | Largespot livebearer | |
| Siluriformes | Ariidae | Potamarius izabalensis | native | ||
| Siluriformes | Ariidae | Potamarius usumacintae | native | Usumacinta sea catfish | Bagre Usumacinta |
| Rhinopristiformes | Pristidae | Pristis pectinata | native | Smalltooth sawfish | Pez sierra |
| Rhinopristiformes | Pristidae | Pristis pristis | native | Common sawfish | Pez sierra |
| Cyprinodontiformes | Profundulidae | Profundulus guatemalensis | native | ||
| Cyprinodontiformes | Profundulidae | Profundulus punctatus | native | Oaxaca killifish | |
| Characiformes | Characidae | Psalidodon fasciatus | native | Banded astyanax | |
| Syngnathiformes | Syngnathidae | Pseudophallus mindii | native | ||
| Syngnathiformes | Syngnathidae | Pseudophallus starksii | native | ||
| Cyprinodontiformes | Poeciliidae | Pseudoxiphophorus anzuetoi | native | Blue spotted Guatamala toothcarp | |
| Cyprinodontiformes | Poeciliidae | Pseudoxiphophorus bimaculatus | native | Twospot livebearer | |
| Cyprinodontiformes | Poeciliidae | Pseudoxiphophorus cataractae | endemic | Cobán toothcarp | |
| Cyprinodontiformes | Poeciliidae | Pseudoxiphophorus diremptus | endemic | Sebol toothcarp | |
| Cyprinodontiformes | Poeciliidae | Pseudoxiphophorus litoperas | endemic | Cahabón toothcarp | |
| Cyprinodontiformes | Poeciliidae | Pseudoxiphophorus obliquus | endemic | Usumacinta toothcarp | |
| Siluriformes | Heptapteridae | Rhamdia guatemalensis | native | Pale catfish | |
| Siluriformes | Heptapteridae | Rhamdia laticauda | native | Filespine chulín | |
| Siluriformes | Heptapteridae | Rhamdia parryi | native | Tonala catfish | |
| Siluriformes | Heptapteridae | Rhamdia quelen | native | South American catfish | |
| Cichliformes | Cichlidae | Rheoheros lentiginosus | native | Freckled cichlid | |
| Eupercaria/misc | Haemulidae | Rhonciscus bayanus | native | Purplemouth grunt | |
| Eupercaria/misc | Haemulidae | Rhonciscus crocro | native | Burro grunt | |
| Cichliformes | Cichlidae | Rocio octofasciata | native | Jack Dempsey | |
| Cichliformes | Cichlidae | Rocio spinosissima | endemic | ||
| Characiformes | Characidae | Roeboides bouchellei | native | Crystal tetra | |
| Cyprinodontiformes | Poeciliidae | Scolichthys greenwayi | endemic | Greenway's toothcarp | |
| Cyprinodontiformes | Poeciliidae | Scolichthys iota | endemic | Dashed toothcarp | |
| Gobiiformes | Gobiidae | Sicydium multipunctatum | native | Multispotted goby | |
| Beloniformes | Belonidae | Strongylura exilis | native | Californian needlefish | |
| Beloniformes | Belonidae | Strongylura hubbsi | native | Maya needlefish | |
| Synbranchiformes | Synbranchidae | Synbranchus marmoratus | native | Marbled swamp eel | |
| Cichliformes | Cichlidae | Theraps irregularis | native | Arroyo cichlid | |
| Cichliformes | Cichlidae | Thorichthys affinis | native | Yellow meeki | |
| Cichliformes | Cichlidae | Thorichthys aureus | native | Blue flash | |
| Cichliformes | Cichlidae | Thorichthys meeki | native | Firemouth cichlid | |
| Cichliformes | Cichlidae | Thorichthys pasionis | native | Blackgullet cichlid | |
| Cyprinodontiformes | Profundulidae | Tlaloc candalarius | native | Headwater killifish | |
| Cyprinodontiformes | Profundulidae | Tlaloc labialis | native | Largelip killifish | |
| Cichliformes | Cichlidae | Trichromis salvini | native | Yellow belly cichlid | |
| Cichliformes | Cichlidae | Vieja bifasciata | native | Twoband cichlid | |
| Cichliformes | Cichlidae | Vieja guttulata | native | Amatitlan cichlid | |
| Cichliformes | Cichlidae | Vieja maculicauda | native | Blackbelt cichlid | |
| Cichliformes | Cichlidae | Vieja melanurus | native | Redhead cichlid | |
| Cichliformes | Cichlidae | Wajpamheros nourissati | native | Bluemouth cichlid | |
| Cyprinodontiformes | Poeciliidae | Xenodexia ctenolepis | endemic | Grijalva studfish | |
| Cyprinodontiformes | Poeciliidae | Xiphophorus alvarezi | native | Chiapas swordtail | |
| Cyprinodontiformes | Poeciliidae | Xiphophorus hellerii | native | Green swordtail | |
| Cyprinodontiformes | Poeciliidae | Xiphophorus maculatus | native | Southern platyfish | |
| Cyprinodontiformes | Poeciliidae | Xiphophorus mayae | native | ||
| Cyprinodontiformes | Poeciliidae | Xiphophorus signum | endemic |