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A marlin weighing up to 100 kilograms jumped into a small boat off the New South Wales coast, seriously injuring two brothers, one of whom suffered a fracture when his arm was sliced open.
The marlin breached and landed in the brothers' boat off Wooli, north of Coffs Harbour, at midday on Thursday.
"The marlin's sharp snout sliced open the younger brother's lower right arm, causing an open fracture," NSW Police said in a statement.
"The older brother suffered a deep cut to his right shoulder."
The brothers - aged 46 and 48 - were in a five-metre rigid-hull inflatable boat with a third man, aged 46, who wasn't injured. The boat was doing about 40km/h at the time.
The marlin managed to escape "back into the water", a police spokesperson said.
The younger brother was initially airlifted by the Westpac Rescue Helicopter to Coffs Harbour Base Hospital where he was assessed.
He was then transferred, again by air, to Royal North Shore Hospital in Sydney where he remains in a stable condition.
His older brother was taken to the Coffs Harbour hospital by road and discharged on Thursday night, a hospital spokeswoman told AAP.