Orca: the killer whale (1977).
It’s about a whale that takes revenge on people. It was shot in Newfoundland, has Richard Harris, and is also Bo Derek’s first movie. It’s Birdemic level bad.
I saw this at the drive-in, summer of '77. It's really not a Jaws rip-off any more than Piranha is; the monster has a motive in this one. It's also acted and filmed much, much better than Birdemic! That said, it would be nice to see RiffTrax do it. It's hardly a good movie.
For the love of all things Jaws-ripoffs? This one needs a proper riffing.