In October, further up the coast at Yeppoon, a fisherman in his 50s was also attacked by a shark.
"CPR was ongoing for a very long time and every effort was made to save the man's life", he said. French-speaking tourists launched a dinghy from their yacht and rescued Chritidis, O'Connell said.
"The experience of the last three months has shown this is an area where people are in the water, so it's important that we have some sort of protection measures", he said on Tuesday.
Following the September incidents, four tiger sharks were culled and aquatic traps were laid out by the Queensland government, the Sydney Morning Herald reported.
A 33-year-old man was killed by a shark on Monday evening, after being attacked while swimming off a yacht near Cid Harbor at the Whitsunday Islands.
An spokesperson for Austin Health in Melbourne, where Christidis was a research fellow in the urology department, told the Brisbane Times Tuesday that the department was "devastated by the news".
The Whitsunday Water Police will be conducting patrols of Cid Harbour today along with vessels from other Queensland and Commonwealth Government agencies.
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"It was one of the more hard ones for everyone involved". The species of shark that attacked Christidis has not yet been identified.
Barwick said in a statement that she was "devastated for the family and friends of this young man ... this is a awful tragedy".
At that time, the Queensland Minister for Agricultural Industry Development and Fisheries Mark Furner urged visitors to the area to remain vigilant "and to avoid swimming to reduce the risk of any further shark attacks".
Tasmanian mother of two Justine Barwick (46) was bitten on her left thigh while snorkelling in the same area on September 19 and underwent 18 hours of surgery. A 12-year-old tourist, Hannah Papps, lost her leg when she was attacked in the same spot while swimming from a yacht the next day.
Authorities responded to the two attacks by culling six sharks in the area and installing drum lines for a week.
"If I were the Premier, I would issue the command: Put the drum lines back in Cid Harbour immediately until further notice".
Rescue workers said the man suffered serious wounds to his legs and one arm in the attack, which happened on Monday afternoon in the Whitsunday islands off Queensland state.