Steven, a U.S.-born Mexican businessman, arrives in a Mexican resort village on a yacht anchored offshore. One of the local fishermen and the caretaker of the yacht, Colorado, takes Steven with him when he goes to haul in the sharks he has caught. Steven is annoyed to find that another shark has taken a huge bite out of one of them. Steven then sets his sights on Patricia, an Englishwoman on vacation. They have a whirlwind romance but break up when Steven can't decide if he's in love with her. Steven is extremely jealous, however, when she begins a relationship with Miguel, a womanizing swimming instructor at the nearby resort hotel. While Steven stews on the yacht, Patricia and Miguel have sex. Then she goes
skinny-dipping in the ocean and is eaten by a large
tiger shark. The next day, Steven confronts Miguel in the hotel bar. Miguel tells Steven that Patricia was in love with Steven, but she must have returned to England. Neither man ever learns of her true fate. Miguel introduces Steven to two sisters, American college students Kelly and Cynthia Madison. They go on a double date and swim to the yacht for some skinny-dipping at the sisters' suggestion. The shark is in the water nearby, but they safely make it to the boat. Kelly and Cynthia then hop back and forth between Miguel's and Steven's beds. They all swim back to shore the next morning, and the submerged tiger shark again chooses not to bother them. When Miguel and Steven start a shark hunting business, Miguel tells Steven that they must immediately get out of the water if a tiger shark ever appears. One night, Miguel and Steven meet Gabriella, a young English tourist. Miguel and Steven take Gabriella shark hunting with them. She is appalled by what they do, but admits her feelings for them have become powerful. The three of them decide to have a triangular relationship; she'll be sexually involved with both of them, but they won't fall in love with her or with them. It is loosely implied that Steven and Miguel might be falling in love. They tour the local
Mayan archaeological sites together, then retire to the yacht for sex. The next time they go shark hunting, a shark appears and rips Miguel in half. Gabriella is so upset that she decides to return to England. Steven, meanwhile, vows revenge on the shark, enlisting the local coastguard and fishermen in a campaign to kill the tiger shark and seemingly every other shark in the area. "I hate the bastards", Steven tells the troubled Colonado, who in turn assures him that so many sharks have been killed, the tiger shark must have been one of them. Meanwhile, unbeknownst to Steven or Colonado, the tiger shark attacks another small fishing boat and eats two fishermen. Steven goes to a nighttime beach party, with Kelly, Cynthia and two other American women. After the party ends, Kelly and Cynthia suggest more skinny-dipping. This time, the tiger shark attacks, ripping Cynthia from Steven's arms as he makes out with her in the water. The other women, make it safely to shore. After Kelly's father arrives to take her home, Steven vows to kill the shark himself. That, night, Steven attempts to lure the shark, with a devilfish he had speared for the occasion. When he spots the shark, he shoots it with a speargun, hitting it between the eyes, killing it. Steven's fate is left unknown. ==Cast==