Japanese white 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.

Source: Wikipedia — Japanese white crucian carp (CC BY-SA 4.0)