Was filmed as a comedy-horror film. Roger Corman removed the majority of jokes and humor from the film in post-production, turning the former comedy into a straight horror movie.
One of a cycle of 1980s and mid-late 1970s movies that got made after the box-office success of Jaws (1975). The films include that movie's three sequels, Jaws 2 (1978), Jaws 3-D (1983), and Jaws: The Revenge (1987), as well as Orca (1977), Piranha (1978), Tentacles (1977), Killer Fish (1979), Barracuda (1978), Tintorera: Killer Shark (1977), Blood Beach (1980), Piranha II: The Spawning (1982), The Last Shark (1981), Up from the Depths (1979), Humanoids from the Deep (1980), The Island of the Fishmen (1979), Devil Fish (1984) and Mako: The Jaws of Death (1976).
New World Pictures double-billed this feature with the superior David Cronenberg film The Brood (1979).
The film was shot and edited in Manila, the Philippine Islands. The director's cut was sent back to Los Angeles where Roger Corman had the film re-cut, plus he had additional footage shot and edited into the film.
Sam Bottoms and R. Lee Ermey both appeared in Apocalypse Now(1979), released the same year and also filmed in the Philippines.