Avoid sandbars and sharp drop-offs where fish congregate. Stay out of polluted or murky water. Avoid areas being used by fishermen. Be wary of feeding birds, or porpoises, which indicate the presence of fish. Do not swim if you are bleeding.
Sharks can detect tiny amounts of blood.
Avoid bright swimsuits and uneven tanning. Contrasts attract sharks. Do not splash a lot, since it attracts sharks. Keep pets out of the water. Erratic movements attract sharks.