Sea slug warning

Beachgoers should remain cautious of poisonous sea slugs washed ashore, particularly on Hauraki Gulf beaches, warns the Auckland Regional Public Health Service.

Fifteen dogs were unwell with symptoms consistent with tetrodotoxin, TTX, poisoning after eating or coming in contact with sea slugs at gulf beaches between August and September. Six dogs died.

The last reported incident was in October. The Rodney Times featured a woman whose dog was vomitting and convulsing within 30 seconds after licking what looked like a decaying jellyfish on a beach north of Mathesons Bay at Leigh.

Warkworth vet Dr Roger Dunn said the dog had all the hallmarks of TTX poisoning.

The dog has since recovered.

While there are no recent reports of sea slugs washing up in Rodney, the public health service says beach visitors should remain vigilant.

TTX is found in tropical puffer fish but was not previously found in sea slugs. It is extremely toxic to humans, as well as dogs, and a very small dose can be fatal.

Early symptoms include numbness and tingling around the mouth, and nausea. The numbness and tingling might spread to the face, tongue and other areas, with paralysis, lack of coordination, and slurred speech.

Medical attention should be sought immediately if any person becomes unwell after going to the beach - especially after contact with a sea slug.

If a sea slug is found, mark the spot, don't touch it, and contact the Rodney District Council on 0800-426-5169, the Auckland Regional Council or the Agriculture Ministry.