Term used to describe the strictly classified biological group of fishes, sometimes called true fishes to distinguish them from other aquatic life whose common names also end in “fish”, including mollusks crustaceans, echinoderms, and other animals (jellyfish) or any other aquatic life harvested in fisheries or aquaculture (shellfish). Fish Fish is any fish with fins, as distinguished from other kinds of fishes.
Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Their principal function is to help the fish swim.