Different animals adapt to the climate of their environment (eg thick fur, different coats for summer/winter, etc). But for the most part, fish look fundamentally the same (scales, fin placement, etc) across cold and warm water species whether salt, brackish or fresh water.
In: Biology
“Fish” is not really a biological category so much as one of convenience. So the range between fish is like the range between land animals; it’s like asking why are polar bears and giraffes so different in their climate requirements when they both have four legs and fur and lungs.
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