The victim of a deadly shark attack in Sydney's east has been identified as a "keen diver" and regular swimmer.
The man has been named by multiple outlets as 35-year-old Simon Nellist from Wolli Creek.
He died from catastrophic injuries after being attacked by what witnesses say was a four-and-a-half metre great white shark at Little Bay in the city's east on Wednesday.
NSW Premier Dominic Perrottet called it a "horrific tragedy" and said the government extended its sympathies to the family of the man.
"It's a reminder to us all of the fragility of life," the premier said.
"Can I also say to people right across our state we've closed a number of beaches on the advice of the Department of Primary Industries and police, so please follow those instructions."
Sydney's eastern beaches remain closed as drones and jetskis patrol waters for shark sightings.
It was the first attack at a Sydney beach since 1963.
Matt Thistlethwaite, the federal member for Kingsford Smith, said the "incident has sent shockwaves through the community I represent".
He said the swimming spot was "increasingly popular".
A local ocean swim race planned for Sunday was cancelled "out of respect for the swimmer and his family".
Agriculture Minister Dugald Saunders said Primary Industries would work with the other authorities to determine if the shark - or any others - remained in the vicinity.
The department has installed six SMART drumlines between Little Bay and Malabar as part of a shark incident response plan.
Randwick Mayor Dylan Parker told ABC News "there have been no shark sightings to date" on Thursday afternoon.
"Smart drumlines have really proven to be extremely successful and also tagging sharks to know exactly where they are and using our smart shark app, along with ... monitoring with drones."
SMART drumlines are new technology that allow target sharks to be intercepted beyond the surf break.
"We will continue to work really hard to make sure that people feel safe at all of our beaches," Mr Saunders said.
