To get to the bottom of it, they looked at the fish’s anatomy and physiology and discovered something curious in their gills.

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Tuna is one of the most versatile fish in the ocean, the single priciest you can buy (if you're talking about sushi-grade tuna), and also one of the cheapest (if you're talking about the canned stuff) ...

WASHINGTON - Move over, mammals and birds, and make room for a fish called the opah in the warm-blooded club. Researchers said in the journal Science on Thursday that this deepwater denizen is the ...

WASHINGTON, May 14 (Reuters) - Move over, mammals and birds, and make room for a fish called the opah in the warm-blooded club. Researchers said in the journal Science on Thursday that this deepwater ...