Ok.ru - Piranha 3d

The film begins with a group of tourists on a boat tour in Arizona, where they encounter a swarm of piranhas. The piranhas are not your ordinary fish - they've been genetically modified to grow at an alarming rate and are incredibly aggressive.

Here's a brief write-up:

Piranha 3D is a 2010 American horror film directed by Gregory Widen. The movie is a sequel to the 2009 film Piranha. The story takes place 18 months after the events of the first film and follows a new group of characters as they face a swarm of genetically modified super-piranhas. piranha 3d ok.ru