Noun | 1. | ![]() fish genus - any of various genus of fish Cyprinidae, family Cyprinidae - a family of fish including: carp; tench; roach; rudd; dace Carassius auratus, goldfish - small golden or orange-red freshwater fishes of Eurasia used as pond or aquarium fishes Carassius carassius, Carassius vulgaris, crucian carp - European carp closely resembling wild goldfish |