Why do sharks not have swim bladder

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asked Aug 10, 2015 82.0k views

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Pathak Tejpal · Answer 1 · 2015-08-15T20:46:47+0000

Unlike bony fish, sharks do not have gas-filled swim bladders for buoyancy. Instead, sharks rely on a large liver filled with oil that contains squalene, and their cartilage, which is about half the normal density of bone.

Why do sharks not have swim bladder

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