Carassius

thumb|Feral goldfish found in Essex County, Ontario. thumb|Carassius auratus by Alexander Francis Lydon. The goldfish (Carassius auratus) is a freshwater fish in the family Cyprinidae of the order Cypriniformes. It is commonly kept as a pet in indoor aquariums, and is one of the most popular aquarium fish. Goldfish released into the wild have become an invasive pest in parts of North America and Australia.

Carassius is a genus in the ray-finned fish family Cyprinidae. Most species in this genus are commonly known as crucian carps, though that term often refers specifically to C. carassius. The most well known species is the goldfish (C. auratus). They have a Eurasian distribution, apparently originating further to the west than the typical carps (Cyprinus genus, which includes the common carp).

species of fish

species of fish (formerly considered a hybrid between Carassius auratus and Carassius carassius)

species of fish

The ginbuna (Carassius langsdorfii), sometimes referred to as silver crucian carp or Japanese silver crucian carp, is a species of freshwater fish in the carp family (family Cyprinidae). It is native to lakes and rivers in Japan.

thumb|A nigorobuna of Lake Biwa