Bony Fish, also known as superclass Osteichthyes (/ˌɒstiːˈɪkθi.iːz/). As the name indicates, unlike the cartilaginous fish bony fish have a bone, as opposed to a cartilaginous, skeleton. They typically have swim bladders, which helps the body create neutral buoyancy, the perfect balance between sinking and floating. However, these are absent in many species, and have developed into primitive lungs in the lungfishes.

The vast majority of fish are ray-finned fissh, which is an extremely diverse and abundant group, and is in fact the largest class of vertebrates in existence in real life in the current era. The other group of real fish are the lobe-finned fish.

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