Saber-Toothed ViperFish look like true monsters, but are in reality just a few inches long! Many deep-sea fish are black, red, or silvery in color. This is mostly a protective mechanism against being seen by their predators. Black blends in against the dark, deep waters, silver reflects any available light, and red looks black in deep water because this end of the light spectrum disappears with increasing depth.   The viperfish is one of the fiercest predators of the deep. The average less than 12 inches, but can grow to 2 feet. They live in water at depths of 5,000-8,250 feet. The viperfish produces light in its mouth to attract its prey. It has over 350 tiny light organs in its mouth. The viperfish lives in water that is very cold.