Growing up to 5 feet and length and weighing in at over 150 pounds, the Goliath Tigerfish makes a piranha look like a guppy in comparison to this ferocious beast. Locals say it's the only fish that doesn't fear the crocodile, and will even devour some of the smaller ones! In rare instances, it's also been known to attack humans. *Gulp*

As if 32 teeth the size of a Great White Shark's weren't scary enough, this fish has incredible eyesight in murky water and can sense low-frequency vibrations emitted by prey. It has been observed going after 60 pound catfish and literally slicing them in half.

Check out this clip from the Discovery Channel's "River Monsters" where professional angler Jeremy Wade lands the fish after quite a struggle: