22. Black Dragonfish
These small fishes look terrifying, but they’re actually pretty little. There are fierce predators when it comes to hunting small fish, but only the females are capable of it. The males actually have no teeth or even functional stomachs, so many scientists believe that their only purpose is for breeding.
Black dragonfish are very sexually dimorphic, with the females being black with stripes and the males being dull brown. The males are also lacking in sharp teeth and pelvic fins, so that don’t swim around a lot. The females are known to migrate to find a mate and to lay their eggs.