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Why are fish found in cold, fast-moving streams more active than those in warm, slow-moving streams?

User Pagep
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2 Answers

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They produce heat while swimming so the cooler the water, the  faster they swim.
User Anandaravindan
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Because they are able to generate heat the faster they swim. The warmer it is the slower they are going to swim.
User Yoni Gibbs
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