More than 100 surfers have allegedly fallen ill after a disgusting foam appeared on popular beaches.
Surfers have reported symptoms including coughing, sore throats and blurred vision.
Some had not even ventured into the water when their ailments began.
READ MORE: Plane crashes into the sea after take off killing 12
Beach-goers also later found scores of marine animals washed up on the sand.
Snaps taken by surfer, Anthony Rowland, show seahorses and fish among the dead fauna.
He took to social media to warn locals.
“On Saturday, over 100 surfers were infected while surfing or in the car park out at Waitpinga,” said the 42-year-old yesterday (17 March).
“We all experienced a sore throat, dry cough, and irritated eyes.
“Some even reported blurred vision.
“It lasted 24 hours or so.
“Although I am not 100% better today.
“In the following hours/days, there was visible evidence that something weird is in the water.
“A lot of yellow foam and dark green tidelines on the beach and then on Sunday, while collecting water samples, I noticed a lot of different species of fish dead on the beach, including a handful of leafy sea dragons.”
The green-brown froth was first spotted by wave chasers on Saturday (15 March).
It stretched for hundreds of metres along Waitpinga Beach, south of Adelaide, Australia.
Parsons Beach, to the west of the city, was also affected.
The Department of Primary Industries and Regions is investigating the mysterious event, as reported by Need To Know.
The South Australian Environment Protection Authority believes a “microalgal bloom” may be responsible.
A spokesperson said it may have been “driven by hot temperatures and still water and an ongoing marine heatwave”.
Both affected beaches were closed to visitors at the time of reporting.
READ MORE: Shocked magnet fisher stumped after finding s*x toy in canal
