A gas-filled sac present in the body of many bony fishes, used to maintain and control buoyancy.
- An important organ seen in ray-finned fish but not in cartilaginous fish is the swim bladder.
- A characteristic of the family Gobiidae is the absence of a swim bladder, which is used for buoyancy control.
- Some fish, for example, have processes from the swim bladder to the inner ear to transmit airborne vibrations.
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