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Koi 鯉 or more specifically nishikigoi 錦鯉 are colored form of Amur carp (Cyprinus rubrofuscus) that are kept for decorative purposes in outdoor koi ponds or water gardens.

Koi is an informal group of the colored variants of the Amur carp. Japanese people are the ones who classify this. Koi varieties are distinguished by coloration, patterning, and scalation. Some of the major colors are white, black, red, yellow, blue, and cream. The most popular category of koi is the Gosanke, which is made up of the Kohaku, Taisho Sanshoku, and Showa Sanshoku varieties.

Over 1.5 million living animal species have been described - of which around 1 million are insects - - but it has been estimated there are over 7 million animal species in total.

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