Surfwatch Australia director Michael Brown today criticised the NSW Government for responding slowly to shark attacks and sightings.
"The Government's shark spotting and surveillance measures are non-existent," Mr Brown said, as the victim of Sydney's third shark attack in three weeks recovered in hospital.
"I don't think they're particularly well organised when it comes to responding to this type of situation."
His patrol saw no sharks or visible fish activity when it went out today, he said.
"Everything is looking very calm this morning," Mr Brown said.
"Yesterday there was a lot of bait fish activity ... but this morning things are looking very quiet and there doesn't seem to be a lot of bait fish in the water."
NSW Department of Primary Industries shark biologist Vic Peddemors rejected calls for increasing aerial patrols over Sydney beaches.
"It's a well proven fact that aerial surveys do not work," he said.
"Yesterday they knew there was a shark in the area. They were out there soon afterwards and no one spotted it.
"If [aerial patrols] are so effective how come they weren't able to sight the shark that did the damage yesterday?"
Victim making jokes: sister
Andrew Lindop, the teenager mauled off a northern Sydney beach yesterday, is making jokes from his hospital bed after undergoing emergency surgery, his sister says.
Andrew, 15, was attacked by a two-metre long shark during an early morning surf with his father off Sydney's North Avalon beach yesterday.
His father, Charles, got the wounded boy to shore after the shark bit his left thigh to the bone.
Andrew was taken to Royal North Shore Hospital (RNSH) where today he was in a satisfactory condition in a general ward after undergoing a four-hour operation.
His sister Sarah, 16, said the surgery had gone well, although he might need more later in the week.
"He's been really, really brave," she told the Seven Network.
"He's joking and stuff. He's in really good spirits.
"I don't know how much of all of this he'll remember, but he's doing really well."
Sarah said Andrew routinely went for a surf in the morning.
"It was lucky dad was there because often he would go out by himself," she said.
"There's been a lot about [the danger of] going out really early and stuff but at the end of the day it's everyone's routine here. That's what the culture is."
Sarah said she still couldn't believe the attack had happened and many people were in shock.
She said she had never seen a shark before and the attack would not keep her out of the water.
"We all spend a lot of time down here," she said.
"I don't know how great it will be but we'll get back in there."
Mr Peddemors said there was a good chance the shark was a great white but speculation was unhelpful.
"I'm just amazed that people just say it's a great white ... it could be one of any three species out in the open ocean," Dr Peddemors said, referring to the great white, bull and tiger sharks, the only three capable of eating large mammals.
Dr Peddemors will visit Royal North Shore Hospital today to examine photographs of Andrew's wound.
"The Royal North Shore surgeons took photographs for me and I imagine I'll look at those today," Dr Peddemors said.
"From that we can hopefully reconstruct the attack sequence, get an idea of the type of shark involved and, if there's sufficient information, then the approximate size of the shark involved."
Net checked day before
On average, about six sharks a month are caught in the nets off Sydney.
"The nets aren't deteriorating," a spokesman for NSW Primary Industries Minister Ian Macdonald said.
"The one at Avalon was checked the day before."
- with AAP