NEW YORK: A warm-blooded fish known as an opah, or moonfish, is the first true fish ever shown to have a circulatory system similar to those seen in mammals and birds. The ability to pump warm blood throughout its body may provide the animal an evolutionary advantage living in the cold waters deep beneath the ocean surface.
Opah live in oceans around the world at depths of a few hundred feet beneath the surface of the waves. Most fish that live in the dark, chilly waters at these depths move slowly, to conserve energy. They typically wait for prey to come to them, rather than actively hunting.
Moonfish grow to be a few feet long, and propel themselves through the water using the sizable pectoral fins on the sides of their bodies to push themselves along. Researchers believe it is the movement of these fins that helps to warm the fish, speeding their metabolism, allowing them to move more quickly than other fish in the chilly depths of the ocean.
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