More NSW beaches have been closed as red algal blooms are spotted along much of the state's coast. Source: AAP
RED algal blooms are continuing to close beaches along the NSW coast, with sightings as far south as Bateman's Bay and as far north as Newcastle.
Large streaks of red algae were spotted off North Wollongong beach on Thursday and Clovelly, Bronte and Tamarama beaches were all shut.
On the city's northern beaches, Bilgola, Mona Vale, Palm Beach and Newport were also closed due to outbreaks, while splashings of red algae were spotted at Newcastle.
"We were out fishing at Stockton this morning and we came across a little bit out there," Newcastle Surf Life Saving Club president Brad Kinniard told AAP.
It was the first time he had seen a red bloom, despite being in the area for more than 25 years, he said.
A spokesman for the NSW Office of Water said there were also sightings of the tomato-juice coloured blooms as far south as Batemans Bay, which while not formally identified, were likely to be Noctiluca scintillans, which is caused by an upwelling of colder nutrient-rich water.
He said it was difficult to predict whether the warmer weather forecast for the weekend would increase bloom outbreaks.
"It's really up to mother nature and the current weather and ocean conditions prevailing," he told AAP on Thursday.
A bloom was first spotted at Sydney's iconic Bondi Beach at 6.30am (AEDT) on Tuesday, with subsequent outbreaks at Clovelly Beach and Gordons Bay.
Also called "red tide" or "fire in the sea", the algae is non-toxic but contains high ammonia levels that can cause minor skin irritation if you swim in it.
A spokeswoman for Waverley Council said the 12th annual Bondi to Bronte ocean swim would go ahead on Sunday as planned.
However a final call will be made at 7.30am, with updates available at the council Facebook page.
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