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Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Genus: Cyprinus
Species: C. carpio
Subspecies: C. c. haematopterus
Trinomial name
Cyprinus carpio haematopterus
(Linnaeus, 1758)

Koi (Japanese: , Romaji: koi) or more specifically nishikigoi (錦鯉, literally "brocaded carp"), are ornamental varieties of domesticated common carp (Cyprinus carpio) that are kept for decorative purposes in outdoor koi ponds or water gardens.

Koi varieties are distinguished by coloration, patterning, and scalation. Some of the major colors are white, black, red, yellow, blue, and cream.ja:コイ#観賞魚・錦鯉(ニシキゴイ)