Question

2.why do fish in polar regions
go deeper during summer?​

Answer 1

Answer:

Most fish slow down and "rest" near the bottom during cold winter months. ... As cold-blooded creatures, their metabolism dips when temperatures take a dive. The layer of ice that forms on top of a lake, pond, river, or stream provides some insulation that helps the waterbody retain its heat.

Answer 2

Answer:

It is because deep inside the water , it remains warm in the polar regions , whereas the upper surface of the water becomes frozen . The ice of the upper layer acts as an insulator which becomes a barrier between cold temperature outside and warm temperature inside ( where the fishes are )

This is how the fishes survive there .

Hope it helps you . By the way , the quote is nice ...