24 Q 15

Sharks and bony fishes approach or achieve neutral buoyancy in diffent ways. Describe the methods evolved in each group. Why mush a teleost fish adjust the gas volume in its swim bladder when it swims upward or downward? How is the gas volume adjusted?

Bony fishes adjust their buoyancy with a swim bladder. When a fish swims downward, its swim bladder must compress in order to lower bouyancy. Sharks don't have a swim bladder, but instead have a very fatty liver that provides buoyancy because fatty tissue floats.

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