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Air bladder

a vesicle or sac containing air.
Also called gas bladder, swim bladder. Ichthyology. a gas-filled sac located against the roof of the body cavity of most bony fishes, originally functioning only as a lung, now serving in many higher fishes to regulate hydrostatic pressure.
Historical Examples

In the great majority of fishes, a curious sac or bag known as the swimming or air bladder is found.
Chambers’s Journal of Popular Literature, Science, and Art Various

The dorsal and ventral fins are both very long; and, as is usual with bottom fishes, the swimming or air bladder is absent.
The Sea Shore William S. Furneaux

Isinglass is a sort of glue made from the viscera and air bladder of certain fish, as cod and sturgeon.
Handwork in Wood William Noyes

So slender and displacing so little water, this fish has no need of the air bladder which supports the thicker fish.
The Sea Jules Michelet

An organ peculiar to fishes is the air bladder—a sac lying under the backbone and communicating by a duct with the stomach.
Zoology: The Science of Animal Life Ernest Ingersoll

Each is reached by the auditory nerve from the brain and is also connected with the air bladder in many cases.
Zoology: The Science of Animal Life Ernest Ingersoll

The air bladder therefore assists the ear of the catfish as the tympanum and its bones assist the ear of the higher animals.
Appletons’ Popular Science Monthly, July 1899 Various

The habit is also common to some species of mud fishes of the order Dipneusti, in which the air bladder plays the part of lungs.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 Various

(ichthyol) Also called swim bladder. an air-filled sac, lying above the alimentary canal in bony fishes, that regulates buoyancy at different depths by a variation in the pressure of the air
any air-filled sac, such as one of the bladders of seaweeds
air bladder

An air-filled sac in many fish that helps maintain buoyancy or, in some species, helps in respiration, sound production, or hearing. Also called swim bladder.

See float.


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