Loach

Loach, any fish of the group Cobitidina of the Carp family (Cyprinidce). There are six, or more, barbels; the dorsal fin is short or moderate, and the air-bladder partly or wholly enclosed in a, bony capsule. The best known forms are Misyurnus fossilis, the Thunder-fish from stagnant waters of Germany and northern Asia; Nemachilus barbatulus, the common Loach of Britain and the Continent; and Cobitis tcenia, the Groundling.