It is a species that lives in mountain rivers and streams. It feeds on invertebrates, spawn and fish eggs (it is a bentofag predator). It often lies under the stones. Its size is small (8-10 cm), with a massive head and the mouth at the top of the trunk. It has two uneven dorsal fins, joined by a bridge.
It has no scales and the characteristic color is olive brown, with darker spots. It is an indicator of water quality.