Marine biosecurity
If you are heading into the Fiordland Marine Area, please be aware that it is prohibited to harbour the invasive pest seaweed Undaria pinnatifida (Undaria) or have it growing on a vessel’s hull within Murihiku / Southland outside of an Undaria Exemption Area. To prevent the further spread of Undaria, there are requirements when leaving Undaria Exemption Areas, which are areas where Undaria has already established.
Read more about Undaria Exemption Areas in Murihiku / Southland here.
A number of marine pests are found throughout New Zealand waters. These species are easily spread via hull fouling and ballast water, and potentially damaging underwater ecology, fisheries and aquaculture.
We classify nine marine organisms as pests in the Southland Regional Pest Management Plan - immediate threats to Murihiku / Southland include Undaria, the Mediterranean Fanworm, and the Clubbed Tunicate.
To date, only one marine pest species has made its way to Southland's coastal waters - the Japanese seaweed Undaria pinnatifida. However, in ports as close as Dunedin, a number of other marine pests are present that could harm our marine environment and industries.
Undaria (Undaria pinnatifida)
Undaria is an opportunistic invasive seaweed that forms dense stands underwater, giving it the potential to compete for light and space with native species. Due to Undaria's ability to spread rapidly in the marine environment, it is often referred to as the gorse of the sea.
Undaria is native to Japan, where it is grown for human consumption. It looks similar to Ecklonia, a native species. However, mature Undaria plants, which can grow 1-2 meters tall, are characterised by a distinct mid-rib. It's a highly invasive seaweed found in many major ports worldwide, including Bluff Harbour.
In April 2010, Undaria was found on a mooring line in the remote Sunday Cove in Te Puaitaha / Breaksea Sound. It is now established at locations within the Te Puaitaha / Breaksea Sound - Tamatea / Dusky Sound complex and is the focus of the Fiordland Undaria Control Programme.
Mediterranean fanworm (Sabella spallanzanii)
Mediterranean fanworm is a segmented worm that lives within a tube attached to hard substrate. This species of fanworm can grow to 40cm tall and has a singular fan, whereas natives have two fans.
Mediterranean fanworm forms dense colonies and can impact native species by competing for food and space. Recent scientific studies indicate that this fanworm can negatively affect the new generation of some marine species and change nutrient flow.
Mediterranean fanworm is established in Whangārei, Waitematā and Te Whakaraupō / Lyttleton harbours. Isolated cases have occurred in popular ports and harbours in Northland, Coromandel, Tauranga, Picton and Nelson. Continued efforts focus on restricting the spread of Mediterranean fanworm within New Zealand.
The clubbed tunicate (Styela clava)
Styela clava is a club-shaped sea squirt with tough leathery skin. It is cylindrical in shape, grows up to 16cm in length, brown in colour, and has a stalk-like holdfast that anchors the animal to structures such as rocks, wharves and boat hulls. Styela clava has two siphons on the top of the organism, which it uses to filter food from its surrounding environment.
Styela clava is of major concern to New Zealand's aquaculture industry. This species of tunicate has the ability to foul aquaculture gear such as mussel lines, smothering and competing for space and food with farmed species.
What we're doing
Undaria response
In addition to the Fiordland Undaria Control Programme, our dive team regularly inspects high-use sites (berthing areas) throughout the Fiordland Marine Area. This work is undertaken in partnership with the Ministry of Primary Industries and the Department of Conservation.
The aim of our surveillance programme is to detect any plants before they have the opportunity to reach reproductive maturity. If new plants are found, they are measured, the location is recorded, and the plants are removed and destroyed. Additionally, sites throughout the Fiordland Marine Area that are visited regularly by commercial and recreational vessels are surveyed by divers annually.
Fiordland Marine Regional Pathway Management Plan
The Fiordland Marine Regional Pathway Management Plan was formally adopted on 5 April 2017. It was the first of its kind in New Zealand and aims to protect one of New Zealand's most unique and nationally significant areas from marine pests being carried in on local and visiting vessels.
With its breathtaking scenery and pristine waters, Fiordland plays an important role, both ecologically and economically, and it is vital we protect it.
The Plan incorporates rules for clean vessels, including clean hull, clean gear, and residual seawater standards, which apply to vessels of all sizes entering and operating within the area. It also includes a Fiordland Clean Vessel Pass, which helps to ensure that vessel owners/operators are aware of the risks and the ways they can minimise them.
The plan was developed and is implemented by a partnership group including Environment Southland, the Fiordland Marine Guardians, the Ministry for Primary Industries, the Department of Conservation, and Te Rūnanga o Ngāi Tahu.
Find out more about the Fiordland Marine Regional Pathway Management Plan.
What others are doing
To address the issue marine pests pose to New Zealand, MPI leads an extensive bi-annual monitoring programme for marine pest species out at Bluff Port and the surrounding area.
What you can do
The most important thing that you can do to keep our waters pest free is to clean not just your boat but also the marine gear you use.
Check, clean and dry:
- fishing and dive gear
- kayaks
- mooring lines and buoys
- other commercial and recreational marine equipment
It's also important to regularly check the condition of your boat's antifoul and be sure to give your hull a check for marine pests before departing for the Fiordland Marine Area.