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

Warm-blooded fish is an agile predator. An opah captured during longline surveys by the Southwest Fisheries Science Center. NOAA Fisheries West Coast — -- With its tire-sized frame and awkward ...

SEASIDE, Oregon -- A large colorful fish washed ashore on the Oregon coast last week in what aquarium officials called a rare occurrence. The 100-pound (45 kilogram) opah fish, also known as a ...

Last week, a 100-pound tropical Opah, also known as a moonfish, washed ashore on Oregon's coast. The fish was a surprising discovery for both its size and the location where it was found. The Opah has ...

The opah, or moonfish, is kind of like the Rudolph of the fish world. It's not at all like the other reindeer -- um, I mean fish -- but its unique quality makes it incredibly cool. Well, make that ...

SEATTLE — 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 ...

Most fisherman would consider themselves lucky to catch one elusive opah fish in their lives, but one recreational fishing boat landed three in one day this on recreational fishing boat landed three ...

New research demonstrates a remarkable adaptation in a fish. It has a warm heart We usually think of fish as cold-blooded creatures and 99.9% of them are. But the opah, a deep-sea fish, has distinctly ...

SEASIDE, Oregon -- A large colorful fish washed ashore on the Oregon coast last week in what aquarium officials called a rare occurrence. The 100-pound (45 kilogram) opah fish, also known as a ...