Researchers have discovered the first fish that warms its body much like mammals and birds. Has this bottom-dwelling anomaly been hiding in its deep, cold water home, evading scientists for years? Not ...

Have you discovered opah yet? It’s among the most versatile of fish, suitable for any manner of cooking, flavorful yet mild whether grilled, pan-fried, seared, poached or stir-fried. You can serve it ...

Anglers on a tuna-fishing trip out of San Diego are surprised to find an opah school in their midst; three of the large moon-shaped fish are landed Armando Castillo, Joe Ludlow and Travis Savala (left ...

Joe Ludlow’s catch of a 181-pound opah might earn him a world record. The fish’s weight exceeds the current record by 18 pounds. Joe Ludlow poses with rare opah catch that could land angler in the ...

The fish buyer noticed something different about the large, colorful, disc-shaped opah waiting to be sold at the auction house in Honolulu. Among the differences: One fish had a bigger eye than the ...

The rare discovery Wednesday of a 100-pound opah on an Oregon beach will offer students a chance to dissect the brilliantly colored fish. The moon-shaped opah, far north of the typical range for the ...

In a first for marine biology, the large, photogenic opah fish has been found to have a big secret: it’s the only fish known to be warm blooded and capable of heating its entire body. Until now, it ...

It’s one of the most basic biology facts we’re taught in school growing up: Birds and mammals are warm-blooded, while reptiles, amphibians and fish are cold-blooded. But new research is turning this ...

WARRENTON, Ore. — When a 100-pound tropical fish washed ashore on the northern Oregon Coast over the summer, Nate Sandel saw it as a perfect opportunity to educate local kids. Sandel is the director ...

Researchers say they've discovered the first known fully warm-blooded fish. It's called the opah, or moonfish, and it lives in cold environments deep below the ocean's surface. Scientists say the opah ...

New research has revealed the opah, or moonfish, as the first fully warm-blooded fish that circulates heated blood throughout its body much like mammals and birds, giving it a competitive advantage in ...