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Swim bladder of fishes

Explain, how does the swim bladder of fishes work permitting the fishes in order to control their depth under the water?

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From Hydrostatics concept, it is already known that an object never sink in case its density is equal or less as compared to the density of fluid in which it is immersed. When swim or gall bladder is filled with gas it decreases the density of body of fish and when it is emptied this density is rises. This mechanism controls depth of the fish under the water.

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