NOAA scientists have discovered that a large ocean-going fish, called the opah, is fully warm-blooded. Their study, published in the journal Science, shows that the fish’s active style of swimming and ...

Of all the fish in the world, only a few have the capacity to maintain warmth in specific parts of their bodies. But as new research reveals, the deepwater opah has the unprecedented ability to ...

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 ...