魚類不是: 冷血動物!

The opah, or moonfish, is an oval-shaped denizen of the deep that would appear to be sluggish, given its cold-water habitat and ungainly body design.

But new research by NOAA Fisheries reveals this beautifully colored creature to be “the first fully warm-blooded fish that circulates heated blood throughout its body much like mammals and birds, giving it a competitive advantage in the cold ocean depths.”

The research, published Thursday in the journal Science, explains that the opah’s constant fin flapping heats its blood and increases its metabolism, transforming the fish into a swift predator.

Read more at http://www.grindtv.com/wildlife/colorful-and-mysterious-opah-found-to-be-first-fully-warm-blooded-fish/#7Ol6mdBZcVMCKPyV.99