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Newswest 9 | Midland, Texas | newswest9.com

Meet the Opah, the World's Only Warm-Blooded Fish

The manhole cover-sized opah, or moonfish, is the world's only known fully warmed-blooded fish. Though it's not as warm as mammals or birds, a 2015 NOAA study says its blood gives it an advantage over its deep sea dwelling neighbors.