ViperFish

This is a fish that you would not like to come across because, whether or not it means you any harm, it is just terrifying to look at. This fish is very predatory and it actually uses a light producing organ on the end of its fin to attract its prey of small fish (and possibly ill placed toes). Then it uses its large teeth to immobilize its prey. These teeth are so large that the viperfish would be unable to close its mouth if it were not able to curve them behind its head.