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
You can only live within a temperature range, too. You’ll die in 50⁰ water and in 100⁰ water.
Also, water is so much denser than air, it transfers heat so much more. And species that live in only cold or only warm water might have minmaxxed and adapted tightly to a particular temperature.
Edit: I think the adaptations to temperature aren’t visible because there’s no way to fight the temperature of the water. Aquatic mammals have tons of insulation, but fish are almost all cold-blooded and just accept the temperature around them. Different adaptations would be internal chemistry stuff to operate at a different rpm
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