Movies like Island of the Fishmen

If Island of the Fishmen (1979) worked for you, these are the films to try next. They are the science fiction and horror titles that people who watched it most often go on to watch, limited to established films so the list is not padded with obscure entries.

14 films on this list

TMDB's recommendations for this film first, then its similar titles, keeping only horror and thrillers with a poster, a release date, and 50 or more votes.