The Queensland man was killed while surfing in Salt Beach, near Kingscliff on the far north coast of New South Wales, according to Surf Life Saving in New South Wales.
The beaches between the cities of Kingscliff and Cabarita will close for 24 hours.
First responders, police and biologists are now monitoring the area.
Surf Life Saving has deployed multiple jet skis, drones and helicopters to track down the shark. The authorities spotted him from the air and took photographs.
Shark biologists evaluated these photos and the man’s bite marks and determined that it had been a large white shark that measured approximately three meters (9.8 feet), according to Surf Life Saving.
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