News Animals

Deepwater dweller is first known warm-hearted fish

Unlikely opah can keep much of its body warmer than its cold sea surroundings

opah

BIG FISH  A fish called an opah, studied here by researchers, is now proposed to be as about as close to a full-body warm-blooded fish as science has yet discovered.

NOAA Fisheries West Coast/Flickr (CC BY-NC-ND 2.0)

By Susan Milius

- More than 2 years ago

A fish that looks like a giant cookie with skinny red fins comes the closest yet among fishes to the whole-body warm-bloodedness of birds and mammals.