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The Pacific halibut is an ectothermic (cold-blooded) fish, whereas the yellowfin tuna is a regional endotherm; unlike that of ectotherms, its body temperature remains above the ambient water temperature. The basking shark had been classified as a full ectotherm, but researchers Haley R. Dolton et al. found that its body temperature remains 1.0 to above ambient, which is that classification.