The parents of 12-year-old Nico Antic, the boy was attacked by a shark in SydneyHarbour, have confirmed that he has died in hospital.

Nico was jumping into the water from a six-metre rock ledge at Rose Bay’s Nielsen Park, in Sydney’s eastern suburbs, at about 4.20pm last Sunday when he was mauled by a suspected bull shark.

Both his legs were severely injured in the attack, and he survived only because one of his friends risked his life by jumping into the water and dragged Nico back onto the rocks.

But days later, his parents Lorena and Juan Antic shared a statement via The Children’s Hospital at Randwick on Saturday with some sad news.

‘We are heartbroken to share that our son, Nico, has passed away,’ they wrote.

‘Nico was a happy, friendly, and sporty young boy with the most kind and generous spirit. He was always full of life and that’s how we’ll remember him.

‘We would like to sincerely thank the first responders and the teams at Sydney Children’s Hospital, Randwick, for everything they did to care for Nico. We would also like to thank everyone in the community for their support and kind messages.

‘We ask you [to] please respect our privacy during this exceptionally difficult time.’

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The family of 12-year-old Nico Antic (pictured), who was attacked by a shark in Sydney Harbour, has confirmed he has died in hospital

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Nico was jumping into the water from a six-metre rock ledge at Nielsen Park, in Sydney’s eastern suburbs, when he was mauled by a suspected bull shark

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Nico Antic (pictured with his dad) has been described as a ‘happy, friendly, and sporty boy’

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Authorities suspect Nico Antic was bitten by a bull shark (stock image)

Nico was just weeks away from celebrating his 13th birthday next month.

The brave young friend who dragged him out of the water last Sunday has since described how Nico fought for his life during the incident.

‘He kept fighting and breathing in my arms and he never gave up for a second,’ the friend told 7News on Friday.

‘He was the most stubborn person I know and I’m grateful I was there for his last moments awake.

‘There was a brief second where Nico woke up while he was bleeding and he just looked at me and then stopped and I thought I lost him, and I’m so surprised he fought for so long.’

Family friend Victor Pineiro set up a fundraiser on Tuesday to help the family cover expenses, which has collected more than $238,000.

‘Nico was attacked by a shark on Sunday in Sydney Harbour and sustained life-threatening injuries,’ he said, describing it as the ‘worst possible outcome’.

Friends on social media said earlier this week that Nico’s extended family live overseas and will have to travel to Australia to say their goodbyes.

‘Fly high Nico, you were such a nice kid and a gun at rugby,’ one friend wrote, 7News reports.

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The friend of Nico, who pulled him from the water, said he never stopped fighting

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Nico’s parents Lorena and Juan thanked first responders for everything they did in trying to save his life

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Pictured: A map of the shark attacks on the NSW coast between Sunday and Tuesday

‘It hurts to see you go this early. No one deserves to lose their life this young.’

Another said: ‘I don’t know what I’ll do without you… Every time I was with you, you made everything feel more fun, no matter what it was.

‘Still can’t accept that you’re gone, it doesn’t feel real.’

The attack was the first in a spate of four shark encounters across NSW in three days.

On Monday, an 11-year-old boy had an encounter with another shark, which took a large bite out of his surfboard in Dee Why, near Manly in Sydney’s northern suburbs.

That same evening, Andre de Ruyter, 27, was attacked by a bull shark while surfing in Manly.

He was rushed to hospital with critical leg injuries but has since recovered.

On Tuesday, a 39‑year‑old was attacked at Point Plomer on the NSW Mid North Coast.

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Andre de Ruyter (pictured) was rushed to hospital with critical injuries after an attack by a bull shark while surfing in Manly on Monday. He has since made a recovery

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After four shark bites were confirmed within a 48-hour period, authorities ordered the closure of several beaches along the New South Wales coastline including Nielsen Park (pictured)

The shark bit through the man’s wetsuit and took a chunk out of his board. He reportedly drove himself to Kempsey District Hospital.

All of Sydney’s northern beaches were closed for several days this week before reopening ahead of the Australia Day long weekend.

Manly Beach was briefly closed again on Saturday morning after a shark was spotted about 7am. It has since reopened.

Garie Beach at the Royal National Park, further south, was also evacuated and closed by authorities after three sharks were sighted.

NSW’s shark management program, given a $2.5million boost in December, includes SMART drumlines and drone patrols at 50 beaches during school holidays.

Extra freshwater in the harbour after recent heavy rain, combined with the splashing effect from people jumping off a rock face, created a ‘perfect storm’ for Sunday’s shark attack, Superintendent Joseph McNulty said.

‘I would recommend not swimming in the harbour or our other river systems across NSW at this time,’ he told reporters before the Dee Why incident was reported.

Heavy swell has also prevented the operation of SMART drumlines, which have notified authorities of shark activity along most of the NSW coast since Sunday.