NOAA researchers discovered that the opah, or moonfish, is the first known warm-blooded fish. Although its body temperature is not as warm as that of mammals and birds, the opah circulates heated blood throughout its body.
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NOAA researchers discovered that the opah, or moonfish, is the first known warm-blooded fish. Although its body temperature is not as warm as that of mammals and birds, the opah circulates heated blood throughout its body.