All I want to know is if they are good eating.
Millions of years ago a small fish embarked on (a) voyage, abandoning reefs in favor of open ocean. Over the millennia it lost its tail and grew absolutely immense; today it can reach more than 10 feet in length and 5,000 pounds, thus putting itself beyond threat of all but the mightiest predators.
The bizarre ocean sunfish is the world’s biggest bony fish. The Germans call it “the swimming head,” the Chinese “the toppled car fish,” and taxonomists Mola mola — which, ironically enough for something that floats, is Latin for “millstone.” And unlike Nemo’s compatriots, it is beautifully adapted to the high seas.
Mola mola is without doubt the planet’s most oddly proportioned fish. In place of a tail is a structure made of migrated dorsal and anal fin rays known as a clavus, which serves as a rudder. “They look like they’d be a silly design,” said marine biologist and National Geographic explorer Tierney Thys, “but they’re actually very efficient, and one of the few examples of an underwater animal that’s actually flying through the water with lift-based design.”
While most fish swing their tails back and forth to swim, Mola mola has a fused and greatly shortened backbone and relies solely on its towering fins for power. With such a conspicuously flat body, it deftly slices through the water, wide-eyed and mouth agape like a perpetually surprised saw blade.
More details with pics and video at the link.