All of these would provide some degree of water breathing

Squid: also removes blindness, as squids are the ink source.
Fish: also provides fishing luck
Salmon: also provides a jump boost, including when swimming upwards in water
Blowfish: provides poison and thorns effect

The Rabbit effect already gives jump boost, and the Pig effect gives luck which I believe also works for fishing.

I don't think I'll be adding more fish related Totem effects for now.