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HomeMagazineBoat BriefMarine pest or native look-alike?
Marine Pest of the Week
Marine Pest of the Week is a series in which you can learn about the marine pests threatening New Zealand’s waters, how to identify them, and what you can do to help protect our marine environment.
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This article is presented with the support of clean below? Good to go., protecting the coastlines we love.

Marine pest or native look-alike?

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Know the difference and help protect our best boating spots. 

With an army of boats out on the water this summer, it’s a great time to learn how to spot and report marine pests.

The first step is knowing what to look for. While more than 200 non-indigenous marine species are present in New Zealand, only around ten are thought to pose a real threat – which means getting familiar with them is a realistic proposition.

Learn to identify these by checking the marine pest ID guide at marinepests.nz – and if you see something suspicious outside a known location, take a photo, note the GPS coordinates, and report it at report.mpi.govt.nz or call 0800 80 99 66.

Native seagrass is a beneficial species that can be difficult to tell apart from the invasive seaweed exotic caulerpa. // Photo credit: Shaun Lee
Native seagrass is a beneficial species that can be difficult to tell apart from the invasive seaweed exotic caulerpa. // Photo credit: Shaun Lee

Even if you’re unsure, it’s worth reporting. “We’d rather get a thousand false alarms than miss the one that’s right,” says Romany Prevette-Stanaway from Bay of Plenty Regional Council. And remember, keeping your hull, anchor, and gear clean is the best way to stop pests from spreading between locations.

Check out our growing list of marine pests on our website.

Here are the marine pests we talked about in December.

Marine Pest of the Week – Mediterranean Fanworm ​(Sabella spallanzanii)

Marine Pest of the Week – Exotic Caulerpa

Marine Pest of the Week – Asian Kelp (Undaria pinnatifida)

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