One benefit of not having this organ is that the shark's body is incompressible, allowing it to move between different depths without the risk of exploding or imploding. The lack of a swim bladder gives sharks some unique advantages. This oil is lighter than water, providing the shark with additional buoyancy. ![]() In addition to the lift by the fins, sharks also have very large livers that contain a high proportion of oil. Instead, they rely on lift generated by their large pectoral fins, much like the way an airplane's wings provide lift in the air. Sharks, on the other hand, do not have a swim bladder. The swim bladder works by varying the amount of gas it contains, giving the fish buoyancy. Bony fishes utilize swim bladders to move up or down vertically in the water or remain at a uniform depth. Unlike bony fishes, which tend to be restricted to certain depth ranges, sharks are able to move easily between varying depths in the water. The ability to move up and down freely in the water column is, in fact, one of the extraordinary adaptations of sharks. However, sharks do have to swim to avoid sinking to the bottom of the water column. ![]() This allows them to rest on the sea floor and still breathe. 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. Myth #1: Sharks Must Swim Constantly, or They Die ![]() Here are six common myths about sharks and rays. Beyond these similarities, both classes of fish inspire a certain sense of awe - that often has more to do with myth than fact. Stingrays and sharks are very closely related.īoth are elasmobranchs, a subclass of fishes with cartilaginous skeletons, and five to seven gill slits.
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