I did not find any prerequisites that this is a photo montage. Again, I did not find the name of this fish. What is this mutation? Well, one side of the eye would be damaged and overgrown, but here it is clearly visible that one eye was originally supposed. Indeed, in nature, eyes are in any case a paired organ.
As far as I understand, there is only one living creature with one eye:
Cyclops are freshwater planktonic crustaceans that inhabit almost every body of water. They serve as food for many species of fish, larvae, fry. But they also eat many different microorganisms. Thanks to the food activity of the cyclops, natural water is clarified and its quality improved.
Usually, all copepods are called cyclops due to their external similarity in everyday life. The body of the crustacean is dissected into segments. The complex head carries one eye, two pairs of antennas, an oral apparatus plus a pair of legs-jaws.
Who else has one-eyed on our planet have I missed?