buoyancy
The tendency or capacity to rise, float or sink in water.
Used in 6 profiles
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Ichthyological terms, not general ones.
gas bladder
Gas-filled sac with 1-3 chambers, situated just below the vertebral column in most ray-finned fishes. Its primary function is to aid in buoyancy by offsetting the weight of heavier structures such as bone, but is also used for respiration or sound production in some species. Often reduced in benthic fishes and sometimes absent altogether. Also known as the air or swim bladder.
Used in 104 profiles