The victim was reportedly with friends near the tourist destination Horizontal Falls about 5pm yesterday when the crocodile launched out of the water.

The father of one of the man's friends contacted Perth radio station 6PR and said another man in the group used a knife to fight the crocodile off.

"A croc leapt out and grabbed one of them by the head," he told 6PR.

"His mate who was in the tinny with him, a quick thinker, grabbed a knife and stabbed the croc in the head with a knife."

The man, who did not suffer serious injuries, is recovering at home.

Murdoch University crocodile expert Associate Professor David Morgan said the men "are so lucky."

"The mate that came to his mate's rescue, I'm sure he's got beer for life."

The duo, who were off duty at the time, work for Horizontal Falls Seaplane Adventures.

"Both men were undertaking personal activities outside of work hours on a non-guest fishing vessel when the incident occurred," the company said.

The Royal Flying Doctor gave immediate medical advice over the phone but the injured men weren't airlifted to hospital.

They were instead flown by their employer to Broome Hospital today.

According to experts, warmer water means the reptiles flock to the region at this time of year.

"There are thousands of estuarine salt water crocodiles in that region and King Sound in general, yeah it's a hotspot for crocodiles," Morgan said.

Parks and Wildlife are patrolling the area to search for a crocodile that matches the description.

If the reptile still poses a threat, they may remove it from the water.

The attack has prompted visitors to be on high alert.

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