1. The opah, or moonfish, is a fully warm-blooded, deep-diving flat and round fish.
2. The opah has a silvery gray body, red fins and mouth, and white spots all over.
3. Opah average 100 pounds (but can weigh up to 200 pounds) and is the size of an automobile tire-about 3 feet in diameter-but oval shaped.
4. Scientists have discovered recently through DNA testing that there are 5 distinct species of opah.
5. Opah eat fish, krill and squid.
6. Opah dive to depths of 165-1300 feet (50-400 meters).
7. Opah swim using their pectoral (side) fins and swim quickly like tuna.
8. Predators of opah include humans and large sharks such as great white sharks and mako sharks.
9. Scientists have tagged opah and found that they migrate thousands of kilometers.
10. Opah are caught as by-catch—by accident—by the tuna and swordfish fisheries. Off the United States, 30,000 opah were caught by the Hawaiian longline fishery in 2015 and the fishery is worth 3.2 million US dollars.
Also see a similar looking fish, the Mola Mola or Ocean Sunfish: 10 Interesting Facts About the Mola Mola or Ocean Sunfish
Opah, the first warm blooded fish identified: 7 facts you should know about it