Researchers discover first known warm-blooded fish

Researchers discover first known warm-blooded fish

The opah, or moonfish, is the first known fully warm-blooded fish that circulates heated blood throughout its body much like mammals and birds, U.S. researchers said Thursday. Some large predatory fish such as tuna and some sharks can warm muscles or organs during pursuit, but the opah is the first fish found to keep its whole body, including its heart and brain, warmer than the environment, they reported in the U.S. journal Science. A silvery…

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