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Is there enough nutrition in scales? Or is it also taking a bite of the flesh?

I tried looking this up when I last saw it on HN but didn’t find an answer.

Unlike most people would expect, scales lie under the epidermis. They are covered by a thin skin and mucus. The scale in itself is made of collagen and minerals so it has some nutritional value

This kind of fishes can take also a small chunk of the dermis or even the muscle.

The most interesting predatory strategy evolved in African lake cichlids is the "zombie fish". There are species of big fishes that lie motionless in the bottom over one side as if they were dead, they have irregular white patches in the corpse mimicking wounds. When other fishes came attracted by what looks like an easy meal, the corpse came to life again and strike

Thank you. Comments like yours are why I enjoy HN.

Pseudorasbora Parva is doing something similar. It also makes a sound when it's doing it. Sort of like "plop".