Systomus asoka (Kottelat & Pethiyagoda, 1989)
Asoka barb
Asoka barb,  Asoka pethiya
Systomus asoka
photo by Ramani Shirantha

Family:  Cyprinidae (Minnows or carps), subfamily: Smiliogastrinae
Max. size:  17 cm TL (male/unsexed)
Environment:  benthopelagic; freshwater; pH range: 6.5 - 7.5; dH range: 1 - 18; depth range 1 - 2 m
Distribution:  Asia: upper reaches of the Sitawaka River and its tributaries, and Kelani near Kitulgala, Sri Lanka.
Diagnosis:   
Biology:  Found in relatively deep (1-2 m) fast-flowing water, in areas with gravel or sand substrates. Juveniles (1-3cm TL) shoal together in schools of 30-100 individuals in very shallow water (5-25 cm), downstream. Adults occupy deeper water (1-2m), upstream. Usually occupies unshaded areas. Fast swimmers and not easily identified from water surface. Declining numbers due to intensive fishing by fish exporters.
IUCN Red List Status: Critically Endangered (CR); Date assessed: 29 July 2019 (B1ab(iii)) Ref. (130435)
Threat to humans:  harmless
Country info:  Occurs at elevations of 120-250 m. Found in the Sitawaka River and Kelani near Kitulgala. Declining population is due to intensive fishing by fish exporters (Ref. 6028) and siltation (Ref. 11966).


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