The two four metre sharks were seen very close to shore at Copacabana beach about 7am today.
“They were sighted aggressively swimming into a large school of bait fish in the middle of the beach,” Westpac Lifesaver Rescue Helicopter chief executive Stephen Leahy told The Daily Telegraph.
At the southern end of Copacabana beach, a medium-sized shark was spotted swimming around a smaller school of fish.
Mr Leahy also said two medium-sized sharks were trailing a “large school of bait dish 100 metres off shore” at Avoca Beach, and another medium shark was following a small school at the Terrigal headland.
“The water is getting warmer and the bait fish are abundant and so sharks feed on these bait fish,” Mr Leahy said.
The sightings comes after a man was attacked at North Avoca beach on Tuesday evening while surfing.
The 28-year-old reportedly punched the shark and was later taken to hospital with relatively minor cuts and bite marks.
“The concern mainly is Avoca but the sharks we sighted … were around Copacabana, Terrigal and Avoca, so it’s quite a reasonable distance,” Mr Leahy continued.
Mr Leahy was unable to identify the species of shark seen on Wednesday but said details of the sightings were passed onto Surf Lifesaving NSW and the Department of Primary Industries (DPI).
He said Avoca beach was currently closed.