Exostoma Effrenum (Exostoma effrenum), first described by Ng & Vidthayanon, 2014 is a small fish in the family Sisoridae (order Siluriformes). Adults typically reach 6.50 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus.
Distinguished from its congeners by the following characters: eye diameter 11.5-15.0% HL; head width 18.5-19.8% SL; body depth at anus 10.5-12.4% SL; length of adipose-fin base 25.8-29.0% SL; adipose fin distinctly separate from upper procurrent caudal-fin rays; caudal peduncle length 20.5-21.3% SL, depth 5.1-7.0% SL; caudal fin forked; preanal vertebrae 21-22 .: elongated; Cross section: flattened.
Behavioural data for Exostoma Effrenum is currently being reviewed.
Freshwater; benthopelagic. Tropical
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