River Monsters (2012)
IMDB link: IMDB
Synopsis: River Monsters: Extreme angler Jeremy Wade is on the hunt for the freshwater fish with a taste for human flesh. This international excursion through the dark side of the watery depths mixes action and adventure with incredible mysteries, edge-of-the-seat chases and a battle of will between man and almost supernatural beasts that lurk in the serpentine waterways of the planet, subsisting murderously underwater and growing to truly awesome sizes. Like all the best horror movies, the images are intense and immediate, gritty and real. Wade illustrates to the viewer, like a forensic investigation, exactly how these river monsters are constructed to kill.