Cover image: Live tipa (scallops) infested with exotic Caulerpa in Okupu/Blind Bay. Richie Hughes, NIWA. https://creativecommons.org/licenses/by-nc-nd/4.0/

Surveying our rohe

We first conducted a survey around The Noises (Motuhoropapa, Ōtata, Ahaaha Rocks, David Rocks, and Maria Island) and the north-eastern section of Rākino on the 25^th of August. We analysed the footage and thankfully did not spot any exotic Caulerpa. Hūrō!

The second survey we conducted was around the West and East side of Rātōroa and the North and East side of Te Pounui a Peretū (Pōnui Island) on the 16^th of November. Ngāi Tai ki Tāmaki analysed the footage and again did not spot any exotic Caulerpa.



While we are relieved that we haven’t seen any trace of exotic Caulerpa in our survey areas, we will continue to look out for the invasive species and encourage everyone to be aware of the threat this exotic seaweed poses and to assist us in our efforts to limit its spread.

How you can help

Here are some simple steps you can take to help in the fight against exotic Caulerpa if you're out on the water this summer:

• When at sea, before moving to a new location, check your vessel’s anchor, anchor chain, and any other gear which may have come into contact with exotic Caulerpa (e.g fishing line and hooks, dive equipment etc.)
• If you find any exotic seaweed attached – remove it, bag it or contain it securely so it can't get back into the water, then take it back ashore for disposal in a rubbish bin. 

Please be aware that Aotearoa has its own native species of Caulerpa (C. articulata and C. brownie) however their appearance is very different from the exotic species. This fact sheet from MPI shows the difference between the native and exotic species: 

More information

• Ngāti Manuhiri - Te Wero Nui - https://www.ngatimanuhiri.iwi.nz/teweronui  

• Revive Our Gulf - Exotic Caulerpa Response - https://www.reviveourgulf.org.nz/project/exotic-caulerpa-response/  

• Ministry for Primary Industries - Exotic Caulerpa seaweeds in New Zealand - https://www.mpi.govt.nz/biosecurity/exotic-pests-and-diseases-in-new-zealand/pests-and-diseases-under-response/exotic-caulerpa-seaweeds-caulerpa-brachypus-and-caulerpa-parvifolia-in-new-zealand/ 

• NIWA - Marine invader Caulerpa triggers biosecurity response - https://niwa.co.nz/news/marine-invader-caulerpa-triggers-biosecurity-response