Japanese crucian carp

The Japanese white crucian carp, also known as Japanese carp, white crucian carp, or gengoro-buna (Carassius cuvieri), is a species of freshwater fish in the carp family (family Cyprinidae). It is found in Japan and, as an introduced species, in several other countries in Asia. This fish is closely related to the commonly known goldfish.

This is a medium fish, growing up to 50 cm, with a broad head and a blunt snout. The lips are fleshy, and lacking barbels. The body is deep and laterally compressed, with a distinctly humped back. The scales are large and cycloid in shape, with a complete lateral line. Serration is present on the last ray of the dorsal and anal fins, and the caudal fin is forked.