"When flesh-eating piranhas are accidently released into a summer resort's rivers, the guests become their next meal."
Bradford Dillman
as Paul Grogan
Heather Menzies
as Maggie McKeown
Kevin McCarthy
as Dr. Robert Hoak
Keenan Wynn
as Jack
Dick Miller
as Buck Gardner
Barbara Steele
as Dr. Mengers
Belinda Balaski
as Betsy
Melody Thomas Scott
as Laura Dickinson
Bruce Gordon
as Colonel Waxman
Barry Brown
as Trooper
Paul Bartel
as Mr. Dumont
Shannon Collins
as Suzie Grogan
Shawn Nelson
as Whitney
Richard Deacon
as Earl Lyon
Janie Squire
as Barbara Randolph
Roger Richman
as David
Bill Smillie
as Jailer
Guich Koock
as TV Pitchman
Jack Pauleson
as Boy in Canoe
Eric Henshaw
as Father in Canoe
Robert Vinson
as Soldier
Virginia Dunnam
as Girl
Diamond Farnsworth
as Water-skier
Bruce Paul Barbour
as Man in Boat
Robyn Ray
as Screaming Woman
Mike Sullivan
as Dam Guard
Jack Cardwell
as Brandy
Sally Bondi
as Swimming Deb (uncredited)
Eric Braeden
as Dr. Robert Hoak (swimming double) (uncredited)
Joe Dante
as Scuba Diver #2 (uncredited)
Amy Holden Jones
as Hertz Clerk (uncredited)
Andrew G. La Marca
as Scuba Diver #1 (uncredited)
John Sayles
as Army Sentry (uncredited)
Phil Tippett
as Scuba Diver (uncredited)
Director
Screenplay
Roger Corman
Executive Producer
Jon Davison
Producer
Pino Donaggio
Original Music Composer
Editor
Mark Goldblatt
Rob Bottin
Special Effects Makeup Artist
Vincent Prentice
Jon Berg
Special Effects
Dave Morton
Mechanical & Creature Designer
Robert Short
Special Props
Chris Walas
Creature Design
Conrad E. Palmisano
Stunt Coordinator
Chako Van Leeuwen
Co-Producer
Story
Jeff Schechtman
Hisako Tsukuba
Jamie Anderson
Director of Photography
Bill Mellin
Art Direction
Kerry Mellin
Jeff Ayers
Set Decoration
Richard Robinson
Roger Creed
Stunts
Nick Palmisano
Bobby Sargent
Tom Jacobson
Production Manager
Harry Wowchuk
Location Manager
Jools Tippett
Special Effects Assistant
Jerome Seven
Doug Barnett
Adam Beckett
Animation
Susan Arnold
Casting Director
Ben Haller
Key Grip
Joel Goldsmith
Location Sound Mixer
Michael Katz
Gaffer
Charles H. Eglee
Assistant Director
Greg Gears
Dana Christiaansen
Assistant Camera
Tony Santa Croce
Boom Operator
Kevin Hughes
Props
Kathleen Hughes
Chris Brightman
Grip
Bill Decker
Tim Doughten
Assistant Art Director
Brenda Balanda
Assistant Editor
Stacy Russo
Jeanne Rosenberg
Script Supervisor
Sharron Reynolds
Production Secretary
Ashley Stieglitz
Jack Buehler
Wardrobe Assistant
O. C. Perkins
Still Photographer
Ted Boehler
Ed Tarbutton
Production Assistant
Jeff Hoffman
Michael Martin
Jim Boni
Robet Brown
Dick Lowry
Second Unit Director
Tom Hammel
M. Todd Henry
Second Unit Director of Photography
Christopher Tufty
Clyde E. Bryan
Scott Buttfield
Moshe Levin
Richard Anderson
Sound Effects
Dave Yewdall
Teresa Eckton
Kendrick Sweet
Dialogue Editor
Valcie Yewdall
Foley
