There should not be any bright tropical fishes in the neritic areas. However, in order to fit the fancy and innocent ideas of the protagonist, the seafloor should be as colorful as that in the fairy tales. The color matching of fishes should follow the art rules in color contract and color complementarity as well as the influence of brightness, purity and the warm and cold colors. Because colors in some small parts feature low in brightness and purity, it is necessary to enhance the brightness and the saturation properly. As a result, those fishes in the scene with cold color and low purity can stimulate the visual sense of the audiences in Fig.5. When it refers to the complementation of colors, the matching of yellow and purple performs well in visual sense and increases the visibility of those fishes.