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Call to Report Sightings of Exotic Caulerpa

Updated: Aug 21

As many people will know from the news and other sources Exotic Caulerpa is spreading in New Zealand. Unfortunately, it has also been found near Kawau Island.

Many groups are actively working on understanding the impact of and combatting this invasive seaweed that forms vast, dense meadows that compete with NZ native species for space and upset the balance of local ecosystems.

MPI is asking for reports of any sightings of this marine pest. They are also asking that boaties are aware of the control areas, and all boaties are asked to check their anchor and chain are clean before moving to other areas to prevent inadvertent spread.

To report: take a photo, if possible, and note the location. Then either:

Freephone 0800 80 99 66

Or complete the online form at

Below are flyers associated for download:

Caulerpa DL flyer for all areas [PDF, 1.6 MB]

Caulerpa ID guide for divers and other ocean users [PDF, 3.5 MB]

See weed, chuck it straight back (updated February 2023) [PDF, 5.3 MB]

Caulerpa identification guide (February 2023) [PDF, 13 MB]

See weed, chuck it straight back – Summer campaign flyer [PDF, 2.9 MB]

Caulerpa parvifolia and Caulerpa brachypus fact sheet 2022 [PDF, 342 KB]

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