>due to low temperatures Are you sure that's it? Sea water doesn't get any colder than a couple degrees below 0C, so the whole antarctic and arctic seas are al

>due to low temperatures Are you sure that's it? Sea water doesn't get any colder than a couple degrees below 0C, so the whole antarctic and arctic seas are all very similar temperatures no matter what part or what depth you're at. The crabs and fish have antifreeze protein in their blood too.