Pink Salmon Eyesight

March 23, 2004 By: Marshall Cutchin

According to this article by Henry Fountain in the New York Times, Pacific pink salmon adapt to the habit of spending more time in deeper water as adults by altering the type of pigment protein in their eyes. “The changes coincide with the fish’s movement from near the surface, where ultraviolet light is prevalent, to deeper waters, where the light is mostly blue-green.”