The sea underworld is shaken up when the son of shark mob boss Don Lino (Robert De Niro) is found dead, and a young fish named Oscar (Will Smith) is found at the scene. Being a bottom feeder, Oscar takes advantage of the situation and makes himself look like he killed the finned mobster. Oscar soon comes to realize that his claim may have serious consequences.
When a son of a gangster shark boss is accidentally killed while on the hunt, his would-be prey and his vegetarian brother decide to use the incident to their own advantage.