swim bladder Meaning and Definition

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swim bladder

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English definition for swim bladder

1. n. an air-filled sac near the spinal column in many fishes that helps maintain buoyancy

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The swim bladder, gas bladder, fish maw or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to waste energy in swimming.
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