Coldwater fish
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The term coldwater fish can have different meanings in different contexts.In the context of fishkeeping, it refers to ornamental fish species that tolerate the temperatures of a typical indoor aquarium well and do not require a heater to remain active, as opposed to tropical fish whom need a heater to survive in the room temperatures of temperate climates;
In the context of ecology and fishing, it refers to fish species that prefer to inhabit waterbodies or depth zones with much lower temperatures than the average temperate water. Salmonids are a classic example of such types of fish.
Japanese koi carp are coldwater fish.
Koi
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Koi , or more specifically nishikigoi , are colored varieties of carp that are kept for decorative purposes in outdoor koi ponds or water gardens.
Koi
Terraced rice paddies in Yamakoshi, Niigata Prefecture
Illustration of a three-colored carp in Ritsurin Garden, 1900. This is the oldest illustration of koi. It has the kanji characters for asagi on its back and red on its belly.
Odd-eyed cat and Spotted carp, from the magazine "Shonen.", 1910.