Cyprinus rubrofuscus, or the Amur carp, is a species of freshwater fish belonging to the Cyprinidae family. It is the ancestral form of some domesticated koi fish, which are well known for their striking colors as an ornamental species. Often mistaken for the common carp, the species originated in eastern Asia but has since been widely distributed and cultured across the world. Common names include Amur carp and South China carp.