What is it about their bodies that makes it so some fish can only live in warm waters and other fish can only live in cold water?

Question

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

Answer 1

All animals have a different temperature range. It’s mostly just the temperature best suited to their environment.