# 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!_

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.

![caulerpa graphic](https://www.boprc.govt.nz/media/p1rgvxez/think-youve-seen-it.jpg)

- 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](https://www.biosecurity.govt.nz/caulerpa "MPI website").

*Video credit:* *Crispin Middleton ESNZ*

[Video](https://youtu.be/PAO4xqpmdE4)