The oceanic whitetip shark feeds mainly on bony fish, including lancetfish, oarfish, barracuda, jacks, dolphinfish, marlin, tuna, mackerels, and threadfins. Other prey consists of stingrays, sea turtles, sea birds, gastropods, squid, crustaceans, and mammalian carrion (dead whales and dolphins). Feeding behaviour has been reported for this shark and includes biting into schools of bony fish. It also swims through schools of feeding tuna with wide-open jaws, into which the tuna unknowingly swim. The oceanic whitetip shark has also been observed eating garbage that is disposed of at sea. If other species of sharks are encountered by the oceanic whitetip shark during feeding activities, the whitetip becomes aggressive and dominates over them.