I was reading my fish book last night and I reached this ocean sunfish, also known as a mola mola. I thought it was a little strange that they drew the fish, like, turning right, but it turns out the fish just... ends? It literally doesn't have a tail part. That's the end of the fish.
This is a different species in the genus, but it's shaped the same, just a fish head with a big-ass dorsal and anal fins. I think it's kind of cute in a way. Because it doesn't have a tail, it "swings its dorsal fin and anal fin in a characteristic sculling motion", which seems to mean waving both fins in the same direction back and forth.
But these photos with the fish alone don't really give a sense of the scale of these fish, and as it turns out, these fish are HUGE! A fin alone is nearly the size of a human!
The Monterey Bay Aquarium has mola mola in captivity, surprisingly, although they don't seem to be on display. It's astonishing they can healthily keep a fish this large (that isn't, like, a shark).
Here's a neat video of a mola mola swimming around, and then stopping by some smaller fish to get the parasites on its skin cleaned off:
More from the fish book! There don't seem to be very many colourful fish for eating but this is one of them. Again, the illustration is deceptive because there's no indication of scale, although the text does say it weighs up to 220 lbs. While they're not larger than a human like the mola mola, they're still pretty big.
One species is apparently also warm-blooded! I didn't know fish could be warm-blooded; Wikipedia says this is the only known fully warm-blooded fish, and some other fish are partially warm-blooded in parts of their bodies, such as tuna.
Its flesh has different cuts where the meat looks completely different. You can see three of them in that link: the first looks similar to salmon, the second is a rich red colour, and the third one is a really dark red colour and looks super solid. As a fish eater they looks tasty and I'd like to try them as sashimi...
The opah has a funny swimming motion too, it flaps its pectoral fins like wings!