Scientific research shows that all members of fish have eyes sensitive to the colors. Fish and some members of their food chain have color receptors in their eyes optimized for the light of their "space". Eyes that can see a single space color can detect changes in light intensity. In this simplest level of visual information processing, an aquatic animal can recognize that something is different in its space-i.e., that there is food or a predator "over there". Fish attraction light is to use the above characteristics of fish to help fishermen to increase their income.