In the animal world behind every spot, stain or pattern lies an explanation that is known or not yet known.
The false eyespots in some species of fish are an evolutionary strategy of defense. They serve to confuse and misdirect attacks from predators. In fact, the predator aims to catch smaller fish in the most convenient way, that is, from the front, so that fins and opercula of the prey do not get stuck while being swallowed.
So, it is very useful for the prey that head and tail are confused. For this reason, the false eyespots are often found in the back of the body. A classic example is the butterflyfish family, which mask the real eyes with a black stripe and have false eyes behind. Predators therefore, mistakenly attack from behind and the prey has the freeway to escape ahead.