Coldwater fish
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Coldwater fish, in the context of aquariums, refers to fish species that prefer cooler water temperatures than tropical fish, typically below 20 °C (70 °F). Some examples are koi and goldfish. These species tend to grow more slowly, live longer than fish that live in warmer waters and are generally felt to be easier to keep.
[edit] Varieties
The term is also used to refer to fish species in the wild, such as lake trout , arctic char and arctic grayling that prefer colder waters.
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