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Natatory Bladder of a Fish

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The natatory bladder is an internal gas-filled organ that fish use to control their buoyancy. Due to Archimedes' principle, increasing the volume of the bladder moves the fish upward because its average density decreases. A submarine operates by an analogous mechanism.

Contributed by: Enrique Zeleny (April 2012)
Open content licensed under CC BY-NC-SA

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