Tiger fish Goliath is one of the most terrible freshwater fish in the world. It is considered a larger and deadlier version of the piranhas. The length reaches up to one and a half meters with a weight of 50 kilograms. It lives exclusively in Africa, mainly in the basin of the Congo River. When your name is Goliath, you'd better be one humongous, ferocious creature, and the Goliath tigerfish (Hydrocynus goliath) definitely lives up to its moniker. A native of the Congo River basin, the Lualaba River, Lake Upemba and Lake Tanganyika in Africa, it's the largest member of the tigerfish clan, a genus of fierce predators with protruding, dagger like teeth. The biggest one on record was nearly 5 feet long and weighed 154 pounds, the equivalent of a super-welterweight prizefighter. And it outclasses other African game fish in speed and power. Locals say it's the only fish that doesn't fear the crocodile and that it actually eats smaller ones. It's also been known to attack humans in rare instances. It's so lightning quick and forceful that not only will it snap an angler's line, but it will sometimes make off with his or her tackle. No wonder one fishing safari promoter requires clients read a cautionary treatise on the Goliath before agreeing to a fishing trip. The Goliath tigerfish has an olive-colored back and a silvery underbelly. But if you see one, what you'll remember is its mouthful of 32 jagged, razor like teeth. Each tooth can be up to one inch long. The Goliath's teeth are set at the edge of the jaw -- the monster has barely any lips. And when those teeth slam down on prey, it's a clean, almost surgical cut. Those attributes, combined with its muscular physique, make the Goliath a state-of-the-art mayhem machine.