Beware of bluebottles

Nelson City Council has issued a warning to beachgoers after bluebottle jellyfish have washed ashore at local summer spots, including Tāhunanui Beach, and Rabbit Island.

Council says members of the public and their dogs must keep their distance from the jellyfish, which are also known as Portuguese Man o’ War, to avoid their venomous tentacles which remain active after a bluebottle's death.

"Stings are painful but unlikely to cause real harm. If stung, wash the sting area with seawater and remove any attached tentacles with a towel, being careful not to touch them with your hands," council says.

"The sting area should then be immersed under hot tap water for 15 to 20 minutes - do not apply vinegar or methylated spirits. Take pain relief after hot water immersion.

"Anaphylaxis from jellyfish stings is rare, but in cases of severe allergic reaction [swelling in the face, shortness of breath, chest tightness] call 111 for an ambulance."

Council says dog owners should visit the vet immediately if their dog consumes a bluebottle, as it could cause throat swelling.