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Japanese Koi Fish

Amphiuma tridactylum
Conservation Status: 
Domesticated
Habitat: 
Japan

Koi or more specifically nishikigoi, 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. The most popular category of koi is the Gosanke, which is made up of the Kohaku, Taisho Sanshoku, and Showa Sanshoku varieties.

The word koi comes from Japanese, simply meaning "carp." It includes both the dull grey fish and the brightly colored varieties. What are known as koi in English are referred to more specifically as nishikigoi in Japan (literally meaning "brocaded carp"). In Japanese, koi is a homophone for another word that means "affection" or "love"; koi are therefore symbols of love and friendship in Japan.

Source: 
http://en.wikipedia.org/wiki/Koi
This article uses material from the Wikipedia article "Japanese Koi Fish", which is released under the Creative Commons Attribution-Share-Alike License 3.0.