Horseshoe Bay was closed to the public yesterday after onshore wind conditions caused an influx of Portuguese man-of-war.

The beach, popular with tourists, was closed at 12.53pm.

“Lifeguards have hoisted a purple flag at the tower indicating the presence of a marine life hazard,” said a statement from the Department of Parks. “Portuguese man-of-war signs have been placed along the beach and lifeguards are advising beach patrons through informal contact. We wish to advise the swimming public to take extreme care while in or near the ocean over the next few days.

“Portuguese man-of-war can be identified by their bluish, gas-filled float on top of the water, but their long tentacles are often not seen under the surface.

“Portuguese man-of-war can cause extremely painful stings. The public are advised to stay away from them and avoid touching them, even on land, as the tentacles can be very venomous.”