why do sharks sink when they stop swimming

Some sharks must swim constantly in order to keep oxygen-rich water flowing over their gills, but others are able to pass water through their respiratory system by a pumping motion of their pharynx. This allows them to rest on the sea floor and still breathe. However, sharks do have to swim to avoid sinking to the bottom of the water column. This is why sharks are always moving or swimming even while sleeping or resting. Fish with swim bladders do get tired of swimming, which is why they rest for a while when they remain still in the water with

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