An aggressive marine pest is continuing to spread across the upper North Island, prompting renewed warnings for boaties, fishers and divers to help stop its advance.
Exotic caulerpa, an invasive seaweed first detected in New Zealand in 2021, is establishing itself in coastal waters where it forms dense underwater mats that smother native marine life, damage habitats and threaten the health of entire ecosystems.
The seaweed has now been found in several locations, including Aotea (Great Barrier Island), Ahuahu (Great Mercury Island), the Bay of Islands, Kawau Island, Waiheke Island and Whangārei Harbour.
Biosecurity New Zealand has classified exotic caulerpa as an unwanted organism under the Biosecurity Act, with strict controls now in place to slow its spread.
Controlled Area Notices apply in several affected locations, restricting or prohibiting activities such as anchoring, fishing and diving in areas where the seaweed has become established.
Authorities say even tiny fragments can break away from anchors, chains, fishing gear or dive equipment and establish new infestations elsewhere.
Boaties and recreational fishers are being urged to inspect anchors, anchor chains, ropes and fishing gear before leaving the water. Any seaweed found should be removed carefully, sealed in a bag and disposed of in a rubbish bin on land.
People are also being reminded never to throw removed seaweed back into the ocean, as this can contribute to further spread.
Communities are encouraged to stay informed about local rāhui and biosecurity restrictions before heading onto the water, particularly in northern coastal areas where new detections remain possible.
Officials say protecting New Zealand’s marine environment will require cooperation from everyone using the coast, with early detection and responsible boating practices playing a critical role in preventing further damage.
Interactive maps showing current infestation areas and Controlled Area Notices are available through Biosecurity New Zealand’s Marine Pests resources and the Conquer Caulerpa information website.
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