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 well-known knowledge on its head with the discovery of the world’s first warm-blooded fish — the opah.
"The opah, or moonfish, is actually quite fast, and can run with the big boys like tuna and swordfish. That's just one of many surprising revelations coming to light as more of these mysterious fish appear unexpectedly in scientific surveys along the southern California coast. Photographer captures stunning opah images. Ralph Pace dives in with camera after rare catch (and release) off SoCal."