In theory, then, day feeders like bass, trout, and salmon are more sensitive to color than night feeders like walleyes. Studies have shown that rainbow trout and Pacific salmon have color vision similar to that of humans. They can distinguish complementary colors and up to 24 spectral hues. Other studies have shown that brown trout are capable of sharply focusing on near and far objects at the same time and that they can clearly see different colors at different distances.
But light behaves differently in water than it does in air. The various colors of light travel at different wavelengths. The longest wavelengths are the REDS, followed by ORANGES,YELLOWS,GREENS,BLUES, INDIGOS,and VIOLETS. When light travels through water, some of its energy is absorped, and the longest wavelengths are the ones absorbed first. Thus, the warmer colors fade out and gradually appear black as light penetrates the water column. Red light is almot completely absorbed within the first 15-20 feet. Orange penetrates to 30-40 feet, and yellow to 60-70 feet, while green and blue remain visible for as deep as the light penetrates.
Total light intensity is also important. On a cloudy day, colors will not penetrate as deep as they will on a sunny day. At dusk, as light intensity falls, reds are the first color to go, followed by orange, yellow, green, and blue. As total light intensity decreases, the fish's eye switches to vision with rods, and the fish is no longer able to distinguish colors. After dark, fishermen should choose between a light lure or dark one. At dawn, as light intensity increases and fish switch back to cone vision, the order is reversed, and blues, greens, yellows, oranges, and reds appear. At early dawn, some anglers are successful with a red J-plug near the surface. To fish striking from below, it shows up as a dark lure against the lightening sky. As the day gets lighter, red no longer works well, and anglers must experiment with more visable colors.
Hope you learned something........
h2o-----------light and lure's