As the fish in the fish in one layer, which is different from a fish bone or cartilage fish, which fish are most common and well known by the fish in this class will not have a jaw or jaw, but there will be a circular mouth and sharp teeth a lot around. Used for the suction of blood and tissue of other types of fish eaten as food. There is a long, eel-like bone structure, as cartilage. Sea and fresh water.
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