The man was paddling a surf ski near the New South Wales state town of Forster, 300 kilometres north of Sydney, when he was attacked, police said. They said he fell into the water but got back on the surf ski and managed to get closer to shore, where bystanders were able to help him from the water.
He was flown by helicopter for emergency surgery to a leg injury. The state ambulance service described that injury as serious.
Three weeks earlier, a 52-year-old surfer was seriously injured as he repeatedly punched a shark that mauled him off Evans Head, 230 kilometres north of Port Macquarie, the 11th attack including one fatality in five months along a 20-kilometre stretch of northern New South Wales coast.
On February 9, a 41-year-old Japanese tourist was killed around the tourist town of Ballina, also is northern New South Wales. The only fatal attack in Australia since then was in July, when a 46-year-old diver was killed off the island state of Tasmania, 1,600 kilometres south of Ballina.