A woman who was attacked by a shark at Sydney’s Coogee’s beach is no longer in a critical condition and “remembers the whole event in detail”, her brother has said.

Leah Stewart’s brother, Joshua, provided the update on a fundraising site on Thursday, writing that it was “amazing to hear from her so much sooner than anyone expected” and she had been “overjoyed” to see her daughter for the first time since the incident almost two weeks ago.

The 34-year-old teacher will remain in hospital as she continues to recover from surgeries – including an arm amputation.

“Her remaining arm has severe tendon and nerve damage which will require further repair and intensive rehabilitation,” he wrote, adding she did not yet have use of her hand.

“Leah still has a long way to go, with an extensive recovery and rehabilitation process that will have her in and out of surgery through the coming weeks. Leah has shown she is so strong, fighting to come back to her daughter August.”

Sydney beaches have been closed for three days in a row due to great white shark sightings, with one expert warning the predators were coming close to shore to feed on “big balls of salmon off the beaches right now”.

Bondi beach was briefly shut on Sunday due to a sighting and then again on Tuesday, Wednesday and Thursday after local authorities were alerted to great whites.

Other beaches in the Waverley council area, including Tamarama and Bronte, were also closed, along with beaches in the neighbouring Randwick council area, including Clovelly and Maroubra.

Drone footage posted to social media by the Drone Shark App showed both great white and tiger sharks at Bondi.

‘Big balls of salmon’

NSW’s department of primary industries says locals “will have noticed the increasing detections of white sharks on our tagged shark listening stations” but notes “this is not an uncommon occurrence at this time of year”.

Marine biologist and shark expert Rob Harcourt – a regular swimer at Bondi – says it’s actually the “peak time of year when they swim past”.

“They follow the Australian salmon, which migrate up the coast,” the Macquarie University emeritus professor says.

“And there are big balls of salmon off the beaches right now. Multiple shark species are coming in to feed on the salmon, because they’re big, fat, juicy and full of calories.”

Prof Culum Brown, the head of the Fish Lab at Macquarie University, says most sightings or interactions with sharks involve juveniles, which typically move along the NSW coast in late autumn and early winter.

“The adults are often out in the ocean. They travel big, big distances and spend a lot of time offshore,” Brown says. “Juveniles tend to be far more coastal, and they also move up and down reasonably, predictably”.

Brown says that after a certain growth period, juvenile sharks begin “experimenting” with their food sources.

“They switch from a fish-oriented diet, and they start incorporating things like seals and turtles and bigger things… and unfortunately, occasionally they approach swimmers and snorkelers, divers, more often than not, spearfishermen, and of course, the surfers.”

Earlier this week, a woman attacked by a shark at Sydney’s Coogee beach uttered her first words after waking from a coma 10 days after sustaining her injuries.

“I love you,” Leah Stewart told her mother and partner on Tuesday after being bitten by a great white shark on 13 June. Stewart has had five days of surgeries – including an arm amputation – with more to come.

‘Something’s quite different’

Eugene Tan has lived in Bondi for more than 30 years.

The 52-year-old photographer carries a camera to capture the local environment from the sand or in the water almost every day.

Tan was among the locals ushered away from the beach when Bondi’s shark alarm blared on Tuesday. When the siren sounded, one of his two teenage sons was in the water.

“As a parent, you worry that something happens. But they came in. The lifeguards called everyone in and said ‘It’s a great white, take it seriously’,” Tan says.

Tan says he’s “never physically seen a great white shark in the bay” at Bondi during his three decades of taking photographs.

“To see through that [Drone Shark App] that one has been visiting the bay every day for three days in a row is pretty crazy. I mean, it’s unprecedented,” he says.

Tan and his family have “never not gone in the ocean” but the locals says this week “does feels like something’s quite different”

“The whole family’s not in the ocean. The risk is just too high, and especially with a white pointer … it’s kind of the pinnacle of threat in the ocean.”

The New South Wales premier, Chris Minns, said this week that the government would be rolling out “world-leading” shark drones across more of the state’s beaches.

“We’ll be using technology that’s available, but hasn’t been rolled out at scale anywhere in the world, not in California, not in Florida, [nor South Africa] … places where you’ve got developed world economies, large tourism populations and sharks,” Minns said on Wednesday. “We’ll be first.”

Harcourt says that’s a good thing, that’ll come with a cost worth paying.

“I think it’ll not only make people feel safer, but it’ll probably ensure that they are safer,” the professor said. “But what it will also mean is that we spend less time in the water… with more drones in the air, you’ll spot those sharks that were always there, but just weren’t seen before.”