The Viperfish (Mesopelagic - found at 80-1600 meters - about a mile down) is one of the most wicked looking sea monsters. Some of them are black as night all over with light organs (called photophores) in strategic places on their bodies, including one on a long dorsal fin that serves as a lure for the fish it preys upon. Some viperfish (and many other deep ocean fish species) don't have any pigment (color) at all - they're transparent. They also have enlarged eyes, presumably for gathering as much light as possible where there is little or no light at all. The light organs of this sea animal create lights by using a chemical process called bioluminescence.