Koi are an informal group of the colored variants of the Amur carp. Koi varieties are distinguished by coloration, patterning, and scalation. Some of the major colors are white, black, red, yellow, blue, and cream. Koi,were developed from common carp in Japan in the 1820s. Like most fi sh, koi reproduce through spawning in which a female lays a vast number of eggs and one or more males fertilize them. They are now grown and propagated all over the world.
Koi are known to eat a wide variety of organisms including, insects, crustaceans, annelids, mollusks, fi sh eggs, fish remains, and plant tubers and seeds