air bladder

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air blad·der

a gas-filled sac that is present in most fish and functions as a hydrostatic organ; it is located beneath the vertebral column primarily in the anterior abdomen and is connected with the esophagus in some species (for example, goldfish). Oxygen is transferred from a rich venous sinus into the swim bladder to increase buoyancy.
Synonym(s): swim bladder

air bladder

n.
2. See float.
References in periodicals archive ?
But rockfish can't be caught and released because they have sensitive air bladders that can kill them if they're brought out of depths greater than 60 feet.
A G-suit has air bladders, or pockets, that inflate to squeeze the legs and abdomen so blood doesn't pool.
The air bladders flex to allow the user to work through their neurological tone to reach muscle inhibition, putting the user in control of the gradual increase toward extension.
The extra buoyancy of primitive lungs, which probably evolved from the air bladders found in fish, may have helped get these early transitional organisms on the move, too.
King mackerel have small air bladders, typically appearing on your fish finder screen as a narrow mark that looks like a boomerang.