Years ago, Dr. Loren Hill at the Univ. of Oklahoma, did a lot of study on fish and color. Hummingbird or someone came out with a device for bass fisherman to use on determine what color bait bass could see depending on clarity and depth of water. Resulted in some strange colored crank baits, etc. If I remember correctly fish have rod and cones in their eyes similar to what people have and have similar vision at least in part.