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These are captive fish called Koi. Koi (or more specifically nishikigoi) are ornamental varieties of domesticated common carp 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.
Outdoor koi ponds and water gardens. This one was photographed at Riverbanks Zoo in Columbia, SC.
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.