Original Australian Daybill Movie Poster - Island of the Fishmen (L'isola degli uomini pesce). This is a 1979 Italian adventure action horror film directed by Sergio Martino. Starring Barbara Bach, Richard Johnson, Joseph Cotton & Claudio Cassinelli. After their prison ship sinks in the Caribbean, a group of prisoners and a doctor wash ashore on a seemingly deserted island. They soon discover a strange couple, who invite them to stay at their house. While the prisoners try to plan an escape, the doctor does some investigating, and soon finds out just what the pair are really doing, and why the prisoners keep mysteriously disappearing.