Japanese white crucian carp
[2] The Japanese white crucian carp was formerly considered a subspecies of wild goldfish, and was classified as C. auratus cuvieri.[3] Genetic studies using mitochondrial DNA indicate that this species diverged from the ancestral form approximately one million years ago, during the early Pleistocene.[6] Historically, the Japanese white crucian carp was endemic to Lake Biwa,[5] as well as the connected Yodo River system,[7] in Japan.[2] An omnivorous species, Japanese white crucian carp feed on a variety foods, including algae, phytoplankton, macrophytes, and invertebrates, such as insects and crustaceans.[6] Spawning occurs from April to June,[5] and takes place in areas of aquatic vegetation, including reed beds.