Opah fishes are also casually called as Moonfish; these fishes belong to the genus Lampris of the Lampridae family.
These fishes are deep circular, compressed and have a deep red-orange colour with white spots on the flanks.
Opah lives in the open oceans of the United States, Australia along with several other countries of the world with temperate waters.
The Opah was the first fish that was found to be warm-blooded. It means it could produce and circulate heat just like many other animals on the ground such as mammals, birds etc.
Being a warmblood fish, it has the advantage to swim faster, better eye and brain functioning and better endurance in a cold environment.