Scientists have tried to figure out how cave fish, which may not even have eyes, navigate in the dark. They
Researchers studied the structure and methodmovements of 26 species of cave fish from the genus Sinocyclocheilus. In particular, they were interested in the lateral line, the organ of touch, which is a series of sensitive receptors. They allow the fish to navigate, determine the direction and speed of currents.
It turned out that in blind species of Sinocyclocheilusthe lateral line develops more strongly than in the sighted, and for some reason there are more receptors on one side of the body than on the other. Scientists decided to find out why. They put the fish in aquariums and watched them. They saw that the blind fish moved mainly along the walls of the aquarium, touching their head lightly as they moved. The side on which the lateral line was better developed was facing the wall.
Thus, it became clear that blind fish move almost by touch.