Tintorera (1976)

aka’s: Tintorera – The Silent Death/Tintorera… Bloody Waters/Tintorera… Tiger Shark

Two Mexican tourists, Steven (Hugo Stiglitz) and Miguel (Andrés García), on holiday at a tropical island Mexican resort, flirt with various ladies from England, hunt sharks and meet an attractive British blond named Gabriella (Susan George), who shacks up with them. But the partying soon becomes disrupted by a large and monstrous tiger shark who begins attacking and devouring tourists. Then Steven and Miguel decide to take it upon themselves to hunt down and kill the beast. (In English and Spanish language, with some English subtitles).