“Blind Waters” (** out of four) was an obviously derivative shark-shock thriller about a couple (Meghan Carrasquillo and Noam Sigler) stranded at sea and forced to fight for their lives when an unrelenting shark starts to besiege them but this leads to them to turn on one another and suspect one another’s initiatives and identities. Mostly plays as a greatest-hits amalgram of the “Jaws” series but the film this most remind hard-core film lovers like me is 1988’s “Midnight Crossing”. Far from the worst of its ilk but far from the best either.