Vic, a mischievous high school student, flushes the pet fish of one of his hated teachers down the toilet, but soon, people begin to go missing.
When flesh-eating piranhas are accidently released into a summer resort's rivers, the guests become their next meal.
Toxins in a lake drive a fish crazy, and it starts attacking cottagers.
Five teenagers embark on a boating trip off the coast of Florida. The teens get hopelessly lost at sea after they get caught in a fierce storm. Fortunately, the quintet stumble across an abandoned yacht in the middle of the ocean with a mysterious biology lab on board it. Unfortunately, there are also ferocious mutated prehistoric fish running amok on the yacht. Will any of the teens survive this harrowing ordeal?
A scuba diving instructor, her biochemist boyfriend, and her police chief ex-husband try to link a series of bizarre deaths to a mutant strain of piranha fish whose lair is a sunken freighter ship off a Caribbean island resort.
People full of problems...a lake full of piranha!
A giant monster eel attacks a group of high school students on a rafting trip down the American river. The government sends super agent Max Uzi to investigate the killings.