Sydney’s northern beaches continue to deal with swarms of maggots that were first spotted by shocked swimmers on Sunday.

Beachgoers planning on heading to Dee Why were warned that the maggots were spreading after Bilgola and Newport beaches further north were both inundated on Sunday.

A Surf Life Saving spokeswoman told Yahoo7 News it’s believed a bunch of seaweed littered with maggot eggs had washed up during high tide, allowing them to hatch around the popular northern beaches.

The rock pool at Bilgola was closed after the infested seaweed was in there.

View photos Beachgoers at Bilgola came across the swarms of maggots on Sunday afternoon. They now face a waiting game for them to develop into flies. Source: Getty More

View photos Sydney beachgoers are now being warned more maggots could be on the way during the next high tide. Source: Facebook/Jane Gardner More

"It was disgusting, this moving carpet of white maggots," Bilgola local Colin Weir told News Corp.

“I’ve been going to this beach every year for 15 years and have never seen anything like this.

Bilgola resident Jane Gardens shared photos of the scene, writing “zillions of maggots washed up on the tide at Newport Beach”.

Sydney beaches: Lifeguards report Mona Vale, Nth Narrabeen, Long Reef, Nth & Sth Curl Curl, Tamarama, Bronte, Wanda, Elouera, Nth & Sth Cronulla are CLOSED due to dangerous surf conditions. Lifeguards also report large number of kelp fly maggots at Dee Why beach today. — Beachwatch NSW (@BeachwatchNSW) January 30, 2018

View photos Millions of tiny maggots washed up at Newport Beach on Sunday. Source: Facebook/Jane Gardner More

While dangerous surf warnings were issued for several beaches around New South Wales on Wednesday, it was kelp fly maggots that kept swimmers away from Dee Why beach.

Warnings have been issued for Byron Coast, Coffs Coast, Macquarie Coast, Hunter Coast, Sydney Coast, Illawarra Coast and Batemans Coast.

But for northern beaches it's now a waiting game for the larvae to develop into flies, however locals are being warned that more maggots could be on the way during the next high tide.

The spokeswoman said lifeguards have no plans of shutting down any of the maggot infested beaches at this point.

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