Hogfish can use their skin to ‘see’ what colour they are, say scientists

Hogfish have a light-sensitive protein called opsin in their skin. Photograph: Yacov Hay Yacobi/Alamy

What do you call a fish with no eyes? Fsh. What about a fish that can also use its skin as “eyes”? Well, that would be a hogfish.

Hogfish often use their ability to change colours to support their camouflaging abilities. They also have light-sensing skin, or skin vision, that can help them “see” their surroundings.