A young woman is fighting for her life after being mauled by a shark in Sydney Harbour.

Emergency services rushed to Billyard Avenue in Elizabeth Bay at around 7.45pm on Monday to find the woman, who is in her 20s or early 30s, with a severe bite to her leg and suffering ‘major blood loss’.

‘She had serious bleeding. Her injuries are severe,’ a NSW Ambulance spokesman told Daily Mail Australia. 

A helicopter and multiple medical units attended the scene, which was a private wharf. 

It is understood that a passerby who is a veterinarian applied a tourniquet to stem the bleeding from the woman’s leg and may have saved her life. 

A young woman (pictured on the stretcher) has been mauled by a shark in Sydney Harbour

Emergency services rushed to Elizabeth Bay at around 7.45pm on Monday to find the woman with a severe bite to her leg and suffering ‘major blood loss’. A blood-stained boardwalk is pictured at the scene

Georgia (pictured) and her wife, who is a veterinarian, were the first on the scene 

The vet and her wife Georgia were first on the scene to treat the swimmer and kept her alive until the emergency services arrived. 

Georgia said the couple heard a shout and the victim ‘swam up to a boat, but on the way back she got bitten by a bull shark’.

‘We ran out, my wife’s a vet, she basically bandaged it up… bone’s broken, its pretty hectic actually,’ she said.

‘She seems to be OK, she’s in a lot of shock. So am I.

‘We got some bandages, we kept her warm and my wife basically bandaged her up to stop the bleeding.

‘If she got bitten (further) out there, she wouldn’t have survived.’ 

The woman was taken by ambulance to St Vincent’s hospital after being treated by a doctor at the scene and remains in a critical condition.

A NSW Police spokesperson said the woman was swimming when she was bitten in the right leg, suffering severe lacerations. 

Emergency services personnel are pictured carrying the woman on a stetcher 

Emergency services officers and an ambulance are pictured

The emergency personnel are pictured carrying the injured woman on a stretcher

‘Police have been told she was swimming off the wharf at the time. Marine Area Command are patrolling the area as a precaution,’ the spokesperson said. 

‘(The NSW Department of) Primary Industries will be the agency to determine if the woman was bitten by a shark/what kind of shark.’

In February 2022, British man Simon Nellist was killed by 4.5metre great white shark off Little Bay in Sydney’s south-east.

He was the first confirmed fatal victim in Sydney in 60 years. 

A tourniquet was applied to try to stem the bleeding from the woman’s leg

The woman was taken to St Vincent’s hospital after being treated by a doctor and remains in a critical condition

READ MORE: Talented teenage surfer is mauled to death by a shark near Ethel Beach in South Australia 

The shark attack happened near Ethel Beach (pictured) in the Innes National Park, on the Yorke Peninsula