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
Some good comments so far, but also worth bearing in mind that oceans have much less temperature variation than land.
Typically seas vary from -2C to something like 30C (excluding some temporary extreme local temperatures at the upper end).
It’s still plenty big enough that fish need adaptation of course, but not to the same extent as land dwellers would, all else equal.
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