Wikipedia
Tintorera
Tintorera is a 1977 Mexico/ United Kingdom international co-production horror film directed by René Cardona Jr and starring Susan George, Hugo Stiglitz, Fiona Lewis and Andrés García. It is based on the novel of the same name by oceanographer Ramón Bravo that studied the species of shark known as "tintorera" (a 19 ft shark) and discovered the sleeping sharks of Isla Mujeres. The film, along with many monster movies of the 1970s and 1980s is very similar to Jaws. It is also known by the alternative title Tintorera: Killer Shark.
Quentin Tarantino paid tribute to this movie at 8th Morelia International Film Festival shows a copy from his private collection.