Stop the spread of exotic caulerpa!

Exotic caulerpa is a fast growing, invasive seaweed that can form dense underwater fields, threatening native marine life. It hasn’t reached the Bay of Plenty, and we need you to help keep it out!  

The threat 

Exotic caulerpa spreads fast and covers the seafloor. It crowds out native seaweed and shellfish. It damages ecosystems and fish habitats. 

Know what to look for 

Exotic caulerpa is bright green with round, paddle-like blades (up to 10 cm) attached to a long runner called a stolon. 

Do your bit! 

Boaties, fishers and divers – when out on the water, take these simple actions before you move: 

1. See weed: When you pull up your anchor, inspect it and the anchor chain for any attached seaweed. Also check any fishing or dive gear that’s been in the water.
2. Bag it: If you find any seaweed, remove it and securely bag or contain it to stop it getting overboard and spreading to other areas — the smallest piece can spread.
3. Bin it: If possible, take the seaweed ashore and dispose of it securely away from the beach – for example, in your home rubbish or compost.
4. If you can’t do this safely, put it back in the water in the area it came from. 

Report it! 

Help us keep track of where exotic caulerpa seaweed is present. 

If you spot this pest – either at sea or on the beach – report it to Biosecurity New Zealand.

• Under the Biosecurity Act, section 46 – everyone must report suspected notifiable organisms. 
• There are legal rules (known as Controlled Area Notices) and rāhui in place at some locations where exotic caulerpa is present. 
• Find the most up to date information, including affected areas, areas under controls, maps and photos on the Ministry for Primary Industries website.