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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. 

Ryan mako 1.jpg
Salmon Shark 
(Lamna ditropis)
Shortfin Mako Shark 
(Isurus oxyrinchus)
great white shark .jpg
Great White
(Carcharodon carcharias)
Thermo shark slide.jpg

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.

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