Well, now I know why I've caught more fish on red lures, eggs, jigs and corkies than any other color, they are invisible, so the fish don't see them coming toward their open jaws and are hooked before they know what hit'em!

Actually, I think the red color becomes almost black the deeper it is in the water, which means a very high contrast when viewed from below toward the surface, where any light is coming from. The fish we seek all look ahead and up for food/prey, not down, so the contrast would be most important. The colors are really more of an attractant for you and me. After all, if you fished with only one color then you'd catch all of your fish on that one, which would then make it your favorite color.