Controversial shark expert vows to break the law and hunt sharks after Sydney bloodbath - as he issues terrifying warning to Aussies

A shark expert has vowed to personally go out and catch more sharks, saying he is prepared to 'pay the fine' after a string of attacks he claims were entirely predictable.

Joel Nancarrow, owner of Hunter Shark Jaw Restoration, issued an explosive warning online after what he described as the third shark incident in just two days, declaring the coming week would be 'the most dangerous time we will have seen in years'.

'This isn't scare tactics, this is f****** real life danger. This will not be the last one.

'I will be packing my stuff and I'm going to go down in a couple of days and bag limits will be loosely followed, it's something I'm willing to do to prove a point and I'll pay the fine.'

The comments suggest Mr Nancarrow is prepared to deliberately break fishing laws by exceeding legal catch limits.

In NSW, there's a daily catch limit of one bull shark per person.

Beaches in Sydney are on lockdown after three people, including two children, were attacked by sharks in just 26 hours.

The most recent attack at North Steyne Beach in Manly left a surfer in his 20s fighting for his life after he was bitten on the lower leg on Monday.

Earlier the same day, an 11-year-old boy was knocked from his surfboard by a large shark at Dee Why Point, with several bites taken out of his board.

Joel Nancarrow says the attacks were entirely predictable and warns the coming week could be the most dangerous swimmers have faced in years

Joel Nancarrow says the attacks were entirely predictable and warns the coming week could be the most dangerous swimmers have faced in years

The beach was closed at the time due to dangerous swell, with shark nets set as normal.

The attacks followed another incident on Sunday afternoon at Shark Beach in Vaucluse, where a 12-year-old boy was bitten while swimming with friends at a popular jump rock outside the netted swimming area. His friends helped him to shore.

While shark attacks remain rare, Mr Nancarrow warned they are becoming increasingly predictable, particularly during periods of heavy rain combined with warm water and crowded beaches.

'We can almost predict these incidents now. If we can do this, why can't the science put stronger warnings out there?'

Mr Nancarrow said bull sharks were present in 'massive numbers' throughout Sydney Harbour and nearby waterways, driven closer to shore by recent rainfall.

He explained that muddy water reduces visibility and pushes large predators out of rivers and into beaches and harbourside swimming spots in search of food.

'There will be a lot more big ones moving out of the rivers to feed along the beaches this week,' he said.

'They are aggressive predators with no limit to what they will bite. A 12-year-old child is a snack for something like these.'

Mr Nancarrow says heavy rain, warm water and murky conditions are driving bull sharks out of rivers and into crowded beaches in search of food. Pictured: A bull shark in Sydney Harbour

Mr Nancarrow says heavy rain, warm water and murky conditions are driving bull sharks out of rivers and into crowded beaches in search of food. Pictured: A bull shark in Sydney Harbour 

Female bull sharks can give birth to up to 20 pups at a time, with hundreds entering the harbour system each season.

Mr Nancarrow said the fast-growing juveniles quickly become dangerous as they mature.

'With the sharks being in larger numbers, sharks that usually wouldn't bite a human will have to become more opportunistic due to an increased competition for food.'

Police on Monday urged people not to swim in murky, low-visibility water after bucketing rain drenched Sydney and its surrounds at the weekend.

Extra fresh water 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 notify authorities of shark activity along most of the NSW coast since Sunday.

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