air bladder

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air bladder,

in fish: see swim bladderswim bladder,
large, thin-walled sac in some fishes that may function in several ways, e.g., as a buoyant float, a sound producer and receptor, and a respiratory organ. The swim bladder, or air bladder, is located in the dorsal portion of the body cavity and is filled with gases.
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References in periodicals archive ?
If the fish cannot resubmerge, vent additional gas from the fish's air bladder as described above.
Beneath this strap, on both front and back sides, are the other four customized air bladders.
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.
For one thing, these species dwell deep in the ocean and have internal air bladders, which they use for buoyancy control and to equalize to the massive water pressure experienced on the ocean floor.
King mackerel have small air bladders, typically appearing on your fish finder screen as a narrow mark that looks like a boomerang.