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

1. See swim bladder.

2. See float.

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References in periodicals archive ?

Sonar, of course, identifies gamefish by marking the air bladder. King mackerel have small air bladders, typically appearing on your fish finder screen as a narrow mark that looks like a boomerang.

Get the drop on deepwater kings: a downrigger plan for big kings and other striking fish

"Gravity is not as limiting, so you can get by with a variety of motor styles." 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.

African lungfish walk in water: study suggests four-legged locomotion began at sea

It uses a series of straps and expandable air bladders that make it easy to fit over the shoulders and torso yet anchor it in place for support.

Reclaiming a limb

The recliner employs seven separate, active air bladders supporting the neck, lower back, buttocks and thighs.

A revolution in seating

Unfortunately, at least 12 died from the strain of bringing them up 120 feet, despite deflating their air bladders and returning them to the Gulf.