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Shark liver oil
Shark liver oil is an oil obtained from the livers of sharks. It has been used for centuries as a folk remedy to promote the healing of wounds and as a remedy for respiratory tract and digestive system problems.〔() ''American Cancer Society''. Retrieved 28 March 2013.〕〔Gupta P, K Singhal, AK Jangra, V Nautiyal and A Pandey (2012) ("Shark liver oil: A review" ) ''Asian Journal of Pharmaceutical Education and Research'', 1 (2): 1-15.〕 It is still promoted as a dietary supplement, and additional claims have been made that it can treat other maladies such as cancer, HIV, radiation illness, swine flu and the common cold.〔 ''WebMD''. Retrieved 28 March 2013.〕〔(Hemorrhoidal suppository ) ''Daily Med''. Retrieved 28 March 2013.〕
== Function in the Shark ==
Many fish maintain buoyancy with swim bladders. However sharks lack swim bladders, and maintain their buoyancy instead with large livers that are full of oil.〔Oguri, M (1990) ( "A review of selected physiological characteristics unique to elasmobranchs" ) In: ''Elasmobranchs as living resources: advances in the biology, ecology, systematics and the status of the fisheries'', eds. J. H. L. Pratt, S. H. Gruber and T. Taniuchi, US Department of Commerce, NOAA technical report NMFS 90, pp.49–54.〕 This stored oil may also function as a nutrient when food is scarce.〔Bone Q and Roberts BL (1969) ("The density of elasmobranchs" ) ''Journal of the Marine Biological Association'', 49: 913–937.〕 Deep sea sharks are usually targeted for their oil, because the livers of these species can account for up to 20% of their total weight.〔Vannuccini, Stefania (2002) (Shark liver oil products ) In: ''Shark Utilization, Marketing and Trade'', Fisheries Technical paper 389, FAO, Rome. ISBN 92-5-104361-2.〕
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