Blind Cave Loach

About

A troglobitic loach from a single cave stream system in western Thailand, Schistura jarutanini is one of a small handful of blind loach species endemic to the country. It lives in the Mae Nam Kwae Yai basin, spending its entire life in the permanent darkness of an underground stream where it forages for benthic microorganisms along the cave floor. Like other cave-adapted fishes, it shows classic troglomorphic traits. Eyes that are reduced or absent, an adaptation that becomes redundant in a lightless world. Unusually for a cave fish, it retains relatively good body pigmentation rather than the pale, washed-out coloration typical of many hypogean species. The entire known population comes from just 22 specimens collected for its original scientific description, giving you a sense of how restricted and fragile this species' existence is. It belongs to Schistura, the most species-rich genus among the nemacheilid loaches with around 190 described members, a number that keeps climbing. This species is included here purely as a point of interest. It is fully protected under Thai national law, cannot legally be collected, and is entirely unsuitable for the aquarium trade. Its conservation situation is precarious, and it serves as a reminder of how many extraordinary freshwater fish exist beyond what we can ever keep.