Other contributors have said "What fishes are part of the class kingdom?" is the same question as "What fish are part of the class kingdom?" If you believe that these are not asking the same thing and should be answered differently, click here
A fish falls into its own category. It is not a mammal because it only lives in the water, it is not a amphibian, and not a reptile because it can only live in the water.......NOT land. If it lived...