The beluga whale, specifically their children live in the deepest, bluest of seas.
it is a fish
Definitely not a hagfish. They live at the deepest depths of saltwater oceans. Not in rivers
Sea lampreys are fish.
No, a seal is a mammal not a fish.
no it is a fish
A plant-eating mammal that lives under the sea is commonly known as a sea cow or a manatee.
it is a fish
sea lions
No, it is a fish - a seahorse.
there is no fish with a horn, but if you think narwhal it is a aquatic mammal
Manatees and dugongs.
It's a fish. A close relative of the pipe fish.