The University of Newcastle shark expert Dr David Powter encouraged beach-goers to still enjoy the water but to use their common sense.

"Just be aware of the basic safety precautions, heed any advice from authorities and at the end of the day, enjoy your surf or swim," he said.

A shark tooth stuck in a Central Coast man's surf board will be a poignant reminder of the terrifying ordeal.

Luke Allen, 29, was swimming back out from the shores of Kylies Beach, south of Diamond Head with mate Jai Baker after 10am.

When about 100m out to sea, the pair saw a pod of dolphins glide by then suddenly Mr Allen was attacked.

The bull shark came at him three times, biting off his right index finger and cutting his right thigh.

Minutes later, the shark swam away.

Mr Baker helped his injured friend back to shore and several onlookers rushed to his aid, strapping up the hand and contacting emergency services.

Chunks were bitten out of the victim's surfboard and his bloodied board shorts were ripped to shreds.A tooth was lodged in the board.

The full-scale rescue operation included crews from Ambulance Service of NSW, Manning Great Lakes police and Fire and Rescue NSW

More rolling coverage of Friday's shark attack at www.portnews.com.au

Get all the stories in Monday's Port News edition