Viperfish

Viperfish (Chauliodus macouni) is a predatory fish living in the deep in oceans and can reach lengths of up to 30 cm. In daytime it can be found from 500–2500 m below the ocean surface. At night it swims up into shallower depths of less than 600 m where food is more plentiful. Viperfish will mostly eat crustaceans and small fish. It is believed that its first dorsal fin's photophores are used to attract prey.

The viperfish can be characterized by its large mouth, long fang-like teeth and long dorsal fin ray (as much as half its body length). Viperfish are iridescent dark silver-blue color in life with pale fins.

There are many other odd creatures along with viperfish deep in the ocean. The footballfish to the "vampire squid from hell" are a few to mention. In the dark, crushing depths they are rarely seen by human beings, and thus much is still not known about them.

The Viperfish was namesake for Roger C. Dunham for his book "Spy Sub" (Viperfish (SSN-655)). It can be noted that the movie Finding Nemo gave attention the viperfish and other deep sea fish by an encounter and near ecape from a Viper-like character.