This real-life giant piranha is nearly five feet long and weighs 154 pounds. It is the largest member of the tigerfish clan, a genus of fierce predators with protruding, dagger-like teeth. It is found in Congo River system and Lake Tanganyika.
It is the only fish that doesn't fear crocodile, locals say, and it actually eats smaller ones. Sometimes it also attack humans. It's so lightning fast and forceful, not only will it snap an angler's line but it will sometimes make off with his or her tackle.
More information and pictures at Digital Journal.
The Syfy channel has Piranhaconda - here's the trailer: