Seals and sea lions live and reproduce on land. Whales live in the ocean. Aquatic creatures are “fish,” while terrestrial ones are “beasts.” Hence, whales are fish, and sea lions are beasts.
Not all piscean fish have scales.
Not all piscean fish are cold-blooded.
Not all piscean fish lay eggs.
Not all piscean fish have fins.
Pisces are defined only as a specific clade or evolutionarily related organisms, having no other workable definition; and thus, biologists are constantly changing their mind as to which organisms should be included into the phylogenic category called Pisces, and which should not.
Currently, sharks, rays, most (but not all) eels, and numerous other creatures which you probably would swear are fish are no longer categorized as Pisces, and are recognized as no more closely related to a Piscean fish than you or I.
Whales are mammals. Deal with it.
Ahhh, didn’t realize we were using the biblical terminology minus the 2000 years of science.