This dude here is The Ocean Sunfish, aka. Mola Mola.
It is the heaviest bony fish in the world, and as you can see, it's really ******* horrifying. This thing swims happily in the warm waters (At 12 °C / 54 °F or more) of every ocean in the world, preying on jellyfish and occasionally squid. But as we all know, the nutritional value of Jellyfish is almost as low as a Happy Meal's. That's why this huge-ass fish has to keep eating pretty much constantly. Since they're slow swimmers, (they swim at around 3.2 kmh / 2 mph), these fat-asses can't really catch anything faster than a ******* jellyfish.
It's the nature's surfing board.
They mostly hang around at depths of 200 meters (656 feet), altough they're known to dive to the depth of over 600m (1968 ft). They often rise to the surface to bask in sunlight and to scare swimmers. They apparently do this as a form of thermal recharging. No, they're not solar powered, but spending time in great depths lower their body temperature, and the best way to warm up is to float on the surface, gathering sunlight in order to launch a solarbeam and to stay warm. Due to warming of the oceans, these things have been met outside their natural waters as north as the southwestern waters of England.
They make inconvient pets.
In captivity, they can live up to ten years, but their natural lifespan is unknown. Don't you go dreaming about a new, exotic addition to your aquarium, though, because these things get huge. And I mean like X-Box-huge. Mature Mola Mola can weigh from 250 to even 1000 kilograms. That's 551 to 2204 pounds. And they're not small either, they have an average length of 1.8 meters (5.9 ft) and they can be 2.5 (8.2 ft) meters from fin-to-fin. The largest Ocean Sunfishes have been more than 3.3 meters (10.8 ft) and 2,300 kg (5,100 lb). And these bitches grow up really fast. A specimen in Monterey Bay Aquarium grew from 26 to 399 kg's (57 to 880 lb) and reached a height of almost 1.8 m (5.9) in just 15 months.
Life's hard for a big, ugly ************. I should know.
The Ocean Sunfish has a thick skin that deters smaller predators. You don't wanna **** with this guy unless you're packin' some serious heat. Like, at least a 9mm, but preferably a shark, Orca, Uzi or a sea lion. They are Mola Mola's natural predators. (Excluding the Uzi and 9mm pistol.) Sea lions are the worst, they are known to hunt and kill these things for sport. They literally rip their fins off and then just toss 'em around and play with them until they abandon them and leave them to sink to the seafloor and die.
Did I mention that it's a Bony Fish?
Speaking of the fins, look at those things. They're amazing. And this isn't just the weed talking, those things are really far out. Evolution works in mysterious way, and at some point it's caudal fin (tail) disappeared and was replaced by a lumpy pseudotail, the clavus after the dorsal and anal fins converged. They became more like a rudder than a tail fin. It's large dorsal fins are often mistaken to a shark when it swims near the surface.
Apparently they're really taste, too.
They are of course completely harmless to humans, not counting the heart attacks they cause by suddenly surfacing next to you, but they're docile creatures, likely because they're too damn stupid to realize how dangerous we are. The only damage these guys cause is the occasional collision with a boat, which usually ends in the poor fish's death and causes damage to the boat. The damage we in turn cause is killing these animals because apparently they taste really ******* good. They also accidentally eat plastic bags, thinking that they are jellyfish. Because these things are morons, like most fish tend to be. Fishermen also kill them, because they consider the Sunfish to be worthless bait thieves. They also tend to cut the fins off and leave the fish to die.
If you're interested in learning more about the Ocean Sunfish, please take your ass to wikipedia and educate yourself: You need to login to view this link