Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Ginbuna
The ginbuna can be difficult to distinguish from the common goldfish ("Carassius auratus"), to which it is closely related. In fact, it has often been treated as a subspecies of goldfish. However, current genetic data suggests that the ginbuna is a distinct species. The ginbuna commonly hybridizes with other species in its genus where they come into contact, as well as with the closely related common carp.