Scientists Discover The World’s First Warm Blooded Fish

The large, round fish—about the size of a manhole cover—uses its warm blood as an advantage in the ocean’s freezing depths.
Deep-water fish called opah appear to be the first fully warm-blooded fish species ever discovered, according to a new paper published in Science. Researchers say the unique biology behind opah, also known as moonfish, allow the species to operate at peak performance even within frigid ocean depths.

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