Category: Society / November 28, 2012 9:40 AM EST
Several beaches in Sydney including Bondi, have been hit by a wave of red algae and were closed on Wednesday (November 28)
Local media said the algae can cause a rash on sensitive skin and is considered noxious as it depletes oxygen levels in the water and can kill fish.
Local newspapers said surfers first spotted the algae just after dawn at Bondi, with the number of sightings spreading throughout the morning - stretching from Wamberal on the Central Coast to Cronulla Beach in the city's south.
The algae bloom was probably caused by a sudden rise in water temperature and humidity, bringing nutrients from the bottom of the ocean up to the surface, local media added.