What determines the color change of flounder?

Flounder changes color depending on the area in which it is located. This camouflage allows her to remain invisible to predators. The camouflaging mechanisms are related to vision. Flounder distinguishes not only colors, but also shades. If the flounder is deprived of sight, then its color will turn black or gray.
Special nerves that control the movement of pigment are responsible for changing the color of the fish. The skin contains various pigments: black, red, yellow and iridescent. This allows the flounder to merge as much as possible with the bottom on which it lives.