Here's a brief write-up:
As the tourists are picked off one by one, a group of survivors must band together to survive the piranha attacks. Along the way, they team up with a fisherman who has a personal vendetta against the piranhas. piranha 3d ok.ru
The film stars Elisabeth Shue, Adam Scott, and Jerry O'Connell, among others. Here's a brief write-up: As the tourists are
Piranha 3D received mixed reviews from critics, with some praising its over-the-top gore and others criticizing its lack of originality. Despite this, the film has developed a cult following over the years. and Jerry O'Connell
As for OK.RU, it seems you might be referring to the Russian social networking platform OK.RU (also known as Odnoklassniki), where the movie might be available to stream or download.