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Whole-body endothermy in a mesopelagic fish, the opah, Lampris guttatus
http://www.sciencemag.org/content/348/6236/786
Meet the Comical Opah, the Only Truly Warm-Blooded Fish - Phenomena: Not Exactly Rocket Science
Scientists have discovered the first fully warm-blooded fish - The Washington Post
http://www.washingtonpost.com/news/energy-environment/wp/2015/05/14/scientists-have-discovered-the-first-warm-blooded-fish/
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