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Koi

Quick Definition

This is a species of carp that is a popular pet in Asia (most notably Japan). When depicted, it's typically shown to be a large white fish covered in red, yellow or brown blotches.

Unlike most pet fish, Koi are kept in ornamental ponds rather than aquariums. These ponds are known as koi ponds, for obvious reasons.

Games that are set in Asia or styled around Asian culture often reference this popular fish in some way. For example, Pixel Puzzles: Japan has the puzzle pieces floating in a koi pond, complete with a koi swimming around with them.