Released to cash in on the success of Jaws, this 1978 horror film from infamous Producer Roger Corman stars US TV actress Heather Menzies as private investigator Maggie McKeown, who's been hired to locate a young couple that have gone missing, whilst out backpacking in some remote woodlands.
Enlisting the help of local man Paul Grogan (Bradford Dillman), they stumble across an old army research facility up in the mountains, which appears to contain rather a large swimming pool. Finding the couples belongings nearby, they decide to drain the pool to see if they fell in, believing the old base to be empty and abandoned.
However, they are subsequently confronted by an irate Dr Hoak (Kevin McCarthy), who's been keeping an eye on the old facility, and informs them they have just released a deadly batch of genetically engineered Piranha into the local river.
With a lakeside resort located down stream and the Piranha devouring anything and everything in their path, it looks like they're going to have an opening weekend that won't be forgotten in a hurry...
Directed by Joe Dante ("Gremlins", "The Howling"), and featuring former horror siren Barbara Steele and B-movie actor Dick Miller, the film was huge hit a drive-in theatres during the late 70s and proved to be big hit on home video during the early 80s on both sides of the Atlantic.
Whilst the effects may look slightly dated by today's standards, it has lost none of its charm over the years and is tremendous fun, as we get to see numerous people, including a bunch of schoolkids, getting devoured by the ravenous fish. So if you love these "nature on the rampage" sort of films, then this comes highly recommended!