The 33-year-old from Victoria suffered significant wounds to his leg and wrist after being bitten at the beginning of a five-day yacht trip with friends at 5.30pm yesterday.
The Whitsunday Islands is a popular tourist site 900 km (560 miles) northwest of the state capital Brisbane.
Prof O'Connell said Dr Christidis showed "amazing patient care" on one occasion getting an upset patient a cake on her birthday.
There were more than a dozen yachts in the harbour at the time.
"Most of (the sailing group) had a medical background".
Western Health director of surgery and head of urology Helen O'Connell told reporters at Footscray Hospital on Wednesday Dr Christidis was a rare individual with "unstoppable optimism".
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The critically ill man was resuscitated twice in less than 45 minutes, Mr McCauley said, before he could be transferred by tender back to shore and flown to hospital.
Police said Tuesday that they have not publicly identified the man as they were still working to contact his next of kin.
Justine Barwick, a 46-year-old tourist, was attacked September 19 while swimming from a yacht in Cid Harbor and is recovering.
A 12-year-old girl and a 46-year-old woman were mauled by sharks in unprovoked attacks, but both managed to survive.
Daniel Gschwind, chief executive of the Queensland Tourism Industry Council, which represents more than 3,000 tourism businesses, said authorities were methodically examining why the unprecedented series of attacks had occurred and whether environmental changes are a factor.
Mr Costigan said there needed to be a frank and open discussion between the tourism and fishing industries, scientists and shark experts about "where we go from here".
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He said: "We see this pattern time and time again - all around the world - and we don't really understand why it is".
"If you look at white pointer shark attacks they happen between 10am and 2pm and if tiger shark are also in the middle of the day".
The man was on a sailing holiday with 10 friends and the group was taking turns to paddle board on the water, Queensland Police said.
"We have just had a fatal shark attack in the Whitsundays and today we have learned a dispute with the Palaszczuk government means there will be a ban on boat patrols for two weeks", she said.
Gschwind called for a science-based response to the latest tragedy.
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