Lauk: Béda antarrépisi

[[Gambar:herring2.jpg|thumb|250px|[[Héring Atlantik]], ''Clupea harengus'': spésiés lauk panglobana di sakuliah dunya.]]

 

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Certain species of fish maintain elevated body temperatures to varying degrees. Endothermic [[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 [[Lamnidae]] – shortfin mako, long fin mako, white, porbeagle, and salmon shark – are known to have the capacity for endothermy, and evidence suggests the trait exists in family [[Alopiidae]] (thresher sharks). The degree of endothermy varies from the billfish, which warm only their eyes and brain, to [[bluefin tuna]] and porbeagle sharks who maintain body temperatures elevated in excess of 20 °C above ambient water temperatures. ''See also [[gigantothermy]]''. Endothermy, though metabolically costly, is thought to provide advantages such as increased contractile force of muscles, higher rates of central [[nervous system]] processing, and higher rates of [[digestion]].-->