Watch Night of the Sharks

This is an Italian/Mexican/Spanish action flick about a crook who blackmails a corrupt businessman for $2 million. The businessman naturally objects to this and sends some thugs after the blackmailer, who tries to seek refuge with his shark-hunting brother who lives on the Mexican coast. He doesn't quite make it, but the brother gains possession of the $2 million and now has to fight off the thugs. There is also a tiger shark in the area that is very willing to eat anybody dumb enough to be in the water.