blakc dragon fish

Black Dragonfish

Deep sea dragon fish are known to produce red bioluminescence, which allows them to see red coloured prey such as shrimp. Most bioluminescence is blue, or blue-green, because those are the colors that travel farthest in water. As a result, most animals have lost the ability to see red light, since that is the color of sunlight that disappears first with depth. Red light causes such prey to fluoresce making them easier to catch.