Why do some sharks need to keep swimming to breathe?
Quick Answer
Some sharks rely on ram ventilation, meaning they must swim with their mouths open to force water over their gills. Others can pump water while resting, so they do not need constant motion.
The Full Story
Sharks breathe using gills, but their method of moving water across the gills varies by species. Fast-swimming sharks such as many requiem sharks depend on ram ventilation, which works only when the animal keeps moving. Species like nurse sharks can actively pump water through their gills and rest on the seafloor. This difference helps explain why some sharks are constantly on the move while others can remain still for long periods. Shark breathing strategies evolved to suit different habitats and lifestyles.
Key Facts
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