the.com/opah

The only fully warm-blooded fish, built like a dinner plate that commutes to the deep.

means A large round deep-sea fish, silver-pink with red fins, that keeps its whole body warmer than the icy water around it.

from The name's exact root is uncertain — it likely comes from a European word imitating a splash or a local fisherman's term, borrowed into English in the 1700s. Unlike most etymologies, this one hasn't been pinned down with confidence, so lexicographers generally just mark it 'origin unknown.'

body heat
Flaps its own pectoral fins to self-heat blood
also called
Moonfish, for its round silvery shape
depth range
Hunts squid 50 to 500 meters down
size
Can weigh over 600 pounds, solo swimmer
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