Father who vanished from sight while snorkelling with his wife and son is feared dead in a shark attack after his badly damaged wetsuit and fins were recovered and two great whites spotted nearby

A snorkeller is feared to have died in a shark attack after his fins and badly-damaged wetsuit were found close to where he went missing.

Victorian father Duncan Craw, who would have turned 33 today, went missing in waters off Surfers Way near Port MacDonnell in South Australia's south-east while on a camping trip with family on Thursday afternoon.

A damaged wetsuit and flippers, believed to belong to the missing father, were found by PolAir and Police Water Operations members on Friday morning.

Victorian father Duncan Craw is thought to have been the victim of a shark attack on Thursday

'It's impossible to fully explain the hole this will leave behind in the lives of all the relatives and friends who love Duncan,' Mr Craw's family wrote in a statement.

'We wish this was all a bad dream.

'He was a cheerful, loving, helpful son. He was a kind and cheeky brother to his sisters. He was a fun-loving, mischievous and supportive mate who had a heart of gold.

'We will never forget Duncan and we will make sure his memory lives on.'

Limestone Coast police operations manager Inspector Campbell Hill said two sharks including one large Great White were seen in the area on Thursday around the time his disappeared.

'The physical evidence along with the proximity of the sharks and the manner in which we've been advised that this male disappeared, we put those pieces together and it sadly does lend itself to a strong belief this is a shark attacked-related incident,' Inspector Hill told reporters. 

But so far, helicopters, drones and water crews have not been successful in locating his body.

Mr Craw had been on a camping trip with his wife Taylia and their young three-year-old son Levi.

Mr Craw had been on a camping trip with his wife Taylia and their young three-year-old son Levi (pictured together)

Taylia was on the sand when she lost sight of him.

'He was the best father to Levi and a beautiful husband and best friend to Tay, his high-school sweetheart,' the family said.

Mr Craw was employed at an agriculture company as an operations manager.

His family said he was also a keen cricketer and played for the Woolsthorpe Club.

'Duncan loved snorkelling and accepted the dangers he may face in the ocean. He was extremely unlucky this time,' the family said.

'On behalf of all Duncan's family we thank all the search and rescue crews, and all the selfless volunteers, for their tireless efforts – and for the care shown by everyone who has offered their help during this awful time.' 

Victorian father Duncan Craw, who would have turned 33 today, went missing in waters off Surfers Way near Port MacDonnell in the south-east of South Australia on a camping trip on Thursday afternoon

Inspector Hill vowed to continue the air and sea search.  

'They were visiting the region and sadly went out for what would have been a nice afternoon at the beach on a warm day and it's unfortunately ended in tragedy,' Inspector Hill said.

'We haven't recovered any remains at the moment, we have not come across this person and we might not come across this person.

'We owe it to the family to exhaust that avenue before we close the search,' he said. 

Jason Willie, the president of the Woolsthorpe 'Warriors' Cricket Club, also made a heartfelt tribute to the 'much loved' sportsman.   

'Duncan's spirit and personality made him a popular and unforgettable member of the club and community,' he said on the club's Facebook page. 

'We are all devastated by the news.' 

A report is set to be prepared by the coroner.