Own the rights?
I like horror movies that happen along or in rivers. Not that there are many "Shock Waves" and "Empire of the Ants" are the only two that come to mind right now. I do not know why, something about the scenery maybe? This movie is of course about piranha released in a river by two people who should not have been messing around a facility. Of course, if they did what they were supposed to do then there would be no movie. This movie was obviously trying to capitalize on the success of "Jaws", but for me it worked. The piranha are slowly making their way down the river and along the way they run into some kids at camp and this resort place. No one believes that they are coming, but that is the way it is in these movies. A sequel would come later and it would be directed by a then unknown James Cameron and it would be awful and a bit boring. Another piranha movie would be made by Roger Corman in the 90's, but it is essentially the same movie as this only not as good.
You may report errors and omissions on this page to the IMDb database managers. They will be examined and if approved will be included in a future update. Clicking the 'Update' button will take you through a step-by-step process.