Fish, belonging to the order Carpiformes, family Loach, genus Thin Loach. Individuals are not large. It is a common fish in the upper reaches of the Yangtze River. There is 1 pair of knob-like protrusions under the chin. There are 3 pairs of whiskers. The subocular spines are not divergent. The end of the ventral fin exceeds the anus. The body color varies greatly, with irregular patches all over the body, or with patches only on the back, or without patches all over the body and brown.