The Twilight Shift Dwellers
By late afternoon, the daytime fishers return to the reef. They return to move closer to their evening retreats. Perhaps they grow nervous that their day vision becomes less efficient at dusk. The smallest fishes start the rush hour to return to their homes at night.

The bright colors of the diurnal fade fast in the twilight. Some fish adjust the color cells in their skin to alter their flashy daytime look. The best defense is to disappear all together.

Many carnivores such as jacks, snappers sharks, barracuda and groupers take advantage of the wariness and confusion of this transition time. Their eyes sensitive to the dim light are better equipped for this time of day . Though twilight predators are not very good at detecting color, they can detect outlines, shapes and movement well. Many predators that have been quietly waiting in the background all day become most active at this time of day.