16) Pacific Viperfish
Source: Imgur
The Viperfish makes up for its small size in appearance. Massive hinged fangs draw inward once dinner is caught, preventing escape. This fish can also put on a pretty impressive light show, with around 350 external bioluminescent organs designed to attract a mate and a meal. It’s stomach is expandable, to allow it to consume large prey whole. They can survive over a week without food.