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Most sharks are cold blooded (ectothermic), meaning their body temperature is the same as the temperature of the water around them. Lamnid sharks ( great white, salmon, shortfin mako, longfin mako and porbeagle) can raise their internal temperature above that of the water around them ( endothermic). These sharks have vascular counter-current heat exchangers ( network of blood vessels called retia mirabilia) that allow them to keep/store the heat generated by their muscles.
Shortfin Mako Shark
Anderson, S. D., & Goldman, K. J. (2001). Temperature measurements from salmon sharks, Lamna ditropis, in Alaskan waters. Copeia, 2001(3), 794-796.
Florida Museum. Shark Biology-Discover Fishes. https://www.floridamuseum.ufl.edu/discover-fish/sharks/shark-biology/
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