By far the largest number of extant fish species on Earth have

Name: By far the largest number of extant fish species on Earth have
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The presence of an operculum and swim bladder is a defining characteristic of bony fish, which make up the vast majority of fish species on Earth. Cartilaginous fish, such as sharks and rays, have a skeleton made of cartilage instead of bone. The behavior of having rasping tongues to enhance parasitism is not a defining characteristic of any particular group of fish.

By Far the Largest Number of Extant Fish Species on Earth