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well, unlike other types of fish or shark species most swim bladders kill over half the population of fish in the world so that tells you what swim bladders do nothing. And gills are to help the fish breath so we have lungs to breath out of fish have special under water lungs so really fish don't have much to worry about under the ocean other than getting killed.

this person is stupid because fish don't get killed by swim bladders!!!! swim bladders create buoyancy in the fish which means how high or low it floats in the water!!! its common sense o_O

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15y ago

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