Scientific Name of Koi carp is Cyprinus carpio var koi.

Koi or more specifically jinli in Mandarin Chinese or nishikigoi, are colored varieties of the Amur carp that are kept for decorative purposes in outdoor koi ponds, water gardens or aquariums. Koi is an informal group name of the colored variants of C. rubrofuscus. Several varieties are recognized by the Japanese.