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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
Farlex Partner Medical Dictionary © Farlex 2012
A gas-filled structure in many fishes that functions to maintain buoyancy and, in some species, to aid in respiration or to produce sound. Also called air bladder, gas bladder.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
swim bladdersee AIR BLADDER.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005