Most people think that sharks like fish, have gas-filled swim bladders. Instead, sharks rely greatly on a oil-filled liver, which contain squalene. Did you know that even though sharks' cartilage is about half as dense as bone and the liver constitutes up to 30% of their body mass, sharks still have to keep on swimming or they would sink. To prevent sinking, sharks employ dynamic lift to maintain depth. Some sharks such as the Sand Tiger sharks store air in their stomachs, using it as a form of swim bladder. Very smart indeed!!! However certain shark species, like the nurse shark, are capable of pumping water across their gills, allowing them to rest on the ocean bottom.
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