7. Viper Fish
Viper fish is the most dangerous deep sea fish and one of the shocking weirdest creatures which in the day time searchers can find at depths of 5000 feet in sea. It only moves upside the sea at the night time and it has long sharp upper teeth with a broad hinge like lower jaw. While waiting for its prey, it stays still in the water without giving a single move and it moves its dorsal spine giving the perception of a moving light which attracts its prey towards it. According to the researchers, viper fish can live for 30 to 40 years.