swim bladder

noun
air bladder ( def 2 ).

Origin:
1830–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
swim bladder
 
n
ichthyol another name for air bladder

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
swim bladder   (swĭm)  Pronunciation Key 
See air bladder.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

swim bladder

buoyancy organ possessed by most bony fish. The swim bladder is located in the body cavity and is derived from an outpocketing of the digestive tube. It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the fish to maintain its depth without floating upward or sinking. It also serves as a resonating chamber to produce sound. In some species the swim bladder contains oil instead of gas. In certain primitive fish it functions as a lung or respiratory aid instead of a hydrostatic organ. The swim bladder is missing in some bottom-dwelling and deep-sea bony fish (teleosts) and in all cartilaginous fish (sharks, skates, and rays)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The first two sounds are produced by muscles contracting around the fish's swim
  bladder.
The lack of swim bladder inflation is a major problem in the intensive culture
  of several species of larval fish.
Burping is a method of expelling excess air from the fish's swim bladder.
The swim bladder has inflated and fish are feeding successfully or the fish
  dies.
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