Like goldfish, Koi belongs to the carp family; something readily apparent by the barbules around their mouths that are one of the describing features of the family. In fact, Koi fish is the Japanese word for fish. Koi are long lived fish, surviving for a very long time with appropriate care. They are favored for their colors, that are of wide-ranging design. If you're looking to breed Koi, remind yourself that there is no assurance that the fry w...