Definition of swim bladder in English:

swim bladder

noun

Zoology
  • A gas-filled sac present in the body of many bony fishes, used to maintain and control buoyancy.

    • ‘A characteristic of the family Gobiidae is the absence of a swim bladder, which is used for buoyancy control.’
    • ‘An important organ seen in ray-finned fish but not in cartilaginous fish is the swim bladder.’
    • ‘The swim bladders of fish work much the same way as a scuba diver's buoyancy control device.’
    • ‘In addition, temperature affects whether or not a fish will sink or float, by altering the volume of gas within the swim bladder.’
    • ‘Some fish, for example, have processes from the swim bladder to the inner ear to transmit airborne vibrations.’