It is the second serious shark attack in Queensland's Whitsunday Islands within 24 hours.
The Department of Agriculture and Fisheries said a Queensland Boating and Fisheries boat arrived at the scene on Thursday afternoon and asked people not to swim in the area anymore.
On Thursday, Queensland Ambulance confirmed that a young girl had been involved in a shark attack at Cid Harbour in the Whitsundays.
Less than a day earlier a 46-year-old woman was bitten at the same location.
She suffered a major injury to her upper left thigh in the attack and was bleeding profusely from the wound when she was pulled from the water at Cid Harbour about 5pm on Wednesday.
The mother of two is in critical condition in the same Mackay Base Hospital after overnight surgery.
Justine Barwick, from Tasmania, was bitten on the leg and flown to the same hospital, where she is also in a critical condition.
Browns fans go after Bud Light Victory Fridge after win
Newly signed Browns kicker Greg Joseph made field goals of 45 and 27 yards after being signed just three days ago. And so ends Cleveland's 19-game winless streak, the NFL's second-longest since the 1970 AFL-NFL merger.
A teenage girl was killed in 2017 by a shark while surfing at a break in Western Australia, and a surf competition at Margaret River was cancelled after two surfers were bitten by sharks.
"In north Queensland, shark attacks are not that common".
"Fisheries officers and water police are already patrolling the area".
"She did suffer a lot of blood loss".
"We were told there was arterial bleeding. quite a big chunk of the leg taken, a few small puncture wounds on her calf muscle". A local doctor adiministered first aid on board the boat, and she was quickly airlifted by rescue helicopter to hospital about 8pm.
Ms Barwick works for non-profit Family Based Care in Burnie and had travelled to the Whitsundays on a holiday with her husband Craig and friends.
On Friday, the woman was reportedly in a stable condition at a Brisbane hospital.