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| | Fish -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08) |
 | | Endothermic (A bony fish of the subclass Teleostei) teleosts (bony fishes) are all in the suborder Scombroidei and include the billfishes, tunas, and one species of ‘primitive’ mackerel (Gasterochisma melampus). |
 | | All sharks in the family (Oceanic sharks) Lamnidae — shortfin mako, longfin mako, white, porbeagle, and salmon shark — are known to have the capacity for endothermy, and evidence suggests the trait exists in family (Thresher sharks) Alopiidae (thresher sharks). |
 | | The degree of endothermy varies from the billfish, which warm only their eyes and brain, to (Largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics) bluefin tuna and porbeagle sharks who maintain body temperatures elevated in excess of 20 deg. |
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