Marine fish live in seawater, and freshwater fish live in fresh water. There are differences in the living environment of the fish, most of which are marine fish, living in the ocean. The specific distribution areas of different species are different, and the depth of distribution is also different. Living in shallow offshore waters, a small number of fish live in the depths of the ocean, and some of them live in fresh water. Therefore, this small number of fish are not marine fish.