The underwater fishing scenes were not simulated and the fish were actually killed.
The original English dub in theaters and on Video actually featured the voices of Susan George and Fiona Lewis, both of whom were the two British tourists in the film. However, this dub was later lost to history and a new one was created with American voice actresses, which was the one used on the DVD.
Due to the censorship imposed by the Mexican government at the time, there were two versions of the film prepared - the so-called uncut version, with plenty of explicit nudity, for foreign markets, and a cut version for domestic (Mexican) exhibition. It's now possible to find both versions on DVD.
One of a cycle of 1980s and mid-late 1970s movies that got made after the box-office success of Les Dents de la mer (1975). The films include that movie's three sequels, Les Dents de la mer, 2ᵉ partie (1978), Les Dents de la mer 3 (1983), and Les Dents de la mer 4 : La Revanche (1987), as well as Orca (1977), Piranha (1978), Tentacules (1977), L'invasion des piranhas (1979), Barracuda (1978), Les dents d'acier (1977), La Plage sanglante (1980), Piranha 2 : Les Tueurs volants (1982), La mort au large (1981), Up from the Depths (1979), Les Monstres de la mer (1980), Le Continent des hommes poissons (1979), Le Monstre de l'océan rouge (1984) and Les Mâchoires infernales (1976).
Quentin Tarantino paid tribute to this movie at the 8th Morelia International Film Festival, showing a copy from his private collection.