I just watched 'Screamers' which is the US cut (with a new intro) of 'L'isola degli uomini pesce', with the English title 'The Island of the Fishmen': https://imdb.com/title/tt0081467/
It was interesting with decent practical effects. The story was, well, ok, but the sets, locations, and cinematography was pretty good. Pretty typical for an Italian-US co-production. The movie reminded me of another Italian-US co-production, 'The Atlantis Interceptors', but was better.
The US version originally didn't have the new intro and was released as 'Something Waits In The Dark' but sold poorly. Prime Video seems to have gotten the name wrong as 'Island of the Fisherman'. (It's always a good sign when movies have multiple names.)
The movie is directed by Sergio Martino who would later release a mash-up of 'The Terminator', 'Blade Runner', and 'Over the Top' called 'Hands of Steel' using the pseudonym Martin Dolman.
Another connection between the two movies was Claudio Cassinelli who was the male lead in this movie and had a smaller role in Hands because he died in a helicopter crash during production.
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