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Sail-World.com : Boaties urged to clean their hull bottoms to protect NZ waters
Boaties urged to clean their hull bottoms to protect NZ waters


'Cleaning you hull at the critical time will help to keep NZ waters clean'    .

New Zealand Boat owners, and especially owners of moored yachts and launches, are being urged to thoroughly clean their hulls before heading away this summer.

John Sanson, Manager National Co-ordination at the Ministry for Primary Industries (MPI) says an increasing number of 'foreign' marine organisms are now threatening our waterways.

'It is essential that we all work together to stop the spread of these potentially devastating organisms,' he says. 'The best way to do this is to ensure hulls are thoroughly cleaned and properly antifouled at all times and especially before travelling from one part of the country to another.'

He says an example of the kind of organisms causing concern is the Mediterranean fanworm (Sabella spallanzanii).

'This worm, which can smother native marine species and is a nuisance to marine farming, is now well-established in the Waitemata Harbour and Hauraki Gulf. It is, unfortunately, unable to be eradicated. However, it is vital that we stop it spreading to other areas such as Northland and the Bay of Plenty.'

Mature female worms are able to release more than 50,000 larvae into the water in one hit during the autumn and winter reproductive season. They can also spread by becoming established in the enclosed wet areas on boats or on dirty vessels and equipment that are then moved to another location.

Although many boat owners believe these foreign organisms mostly arrive in New Zealand in the ballast water of commercial ships, detailed scientific research shows that the majority come in on fouled vessels (both recreational and commercial) — and are then spread in the same way.

'Sadly, once established here, marine pests are extremely difficult to control or eliminate,' says Sanson. 'They can also have a very negative impact on many of things we really value: fishing, shellfish gathering, aquaculture and even the appearance of our treasured bays and beaches.'

Mr Sanson says further examples are the sea squirt, Styela clava (a.k.a. the clubbed tunicate), which has infested many New Zealand harbours, and Undaria seaweed which has reached the pristine Fiordland marine environment.

Styela is an unsightly knobbly sausage-like organism that is a serious nuisance to aquaculture, fouling mussel lines and competing with mussels for space and food. It is present in a number of regions including Auckland, Northland, Nelson, Canterbury and Otago and is now too well-established to eradicate.

Since April 2010, MPI, the Department of Conservation, and Environment Southland have joined forces with the community group Fiordland Marine Guardians,in an attempt to remove Undaria from a remote area in Breaksea Sound, Fiordland.

'We still have a long way to go to be able to say we have no more Undaria, but the results so far are very exciting and promising,' Mr Sanson says.

Looking at the impacts of marine pests and the costs of eradication attempts, it is not surprising that many local authorities including those in Northland, Southland and Bay of Plenty are pleading with boat owners to ensure that their hulls are cleaned and protected, with antifouling in good condition, before heading north or south for the summer.

'The last thing Northland needs is an infestation of the Mediterranean fanworm or any other exotic introduced pest,' says Don McKenzie, Biosecurity Manager with the Northland Regional Council.

'Our marine environment is very important – both for recreational use and also for the marine farming industry. Both tourism and aquaculture are important earners for our region and are vulnerable to the impacts of introduced marine pests.'

Recent experience has shown just how easy it is for these kinds of pests to 'hitch-hike' their way around the coast on a recreational boat. The Bay of Plenty Regional Council has, this November, found two vessels fouled with Styela sea squirts moored in Tauranga Harbour. These boats had arrived from Auckland and Coromandel with 'dirty' bottoms.

'Both owners were very concerned and co-operative but we need boaties to be much more vigilant if we are to keep Tauranga Harbour free from these marine pests,' says Warwick Murray, Natural Resource Operations General Manager for the Bay of Plenty Regional Council.

'It’s absolutely critical that boaties keep their boat hulls clean and take extra care to remove fouling growth from their vessel responsibly before travelling from one area to another.'

Like Sanson, Murray stresses that boat owners need to apply antifouling paint regularly and keep it in good working condition.

'This means it needs to be replaced regularly in line with the manufacturer’s recommendation. It also needs to be renewed in places where the hull has been scraped or damaged or if the hull is being persistently fouled.

'Just as importantly, owners need to regularly check and clean their hull bottoms. They should not allow the build-up of fouling beyond a slight slime layer and need to pay particular attention to what are known as 'niche areas'. These are the prime areas for harbouring pests and are the parts of the hull that stick out or retain water (such as the keel, intakes and outlets, propellers and shafts, rudders and casings).'

Sanson says a simple boat owners’ guide to preventing the spread of marine pests is available on line at: http://www.biosecurity.govt.nz/files/enter/ships/clean-boats-brochure.pdf

As well as asking owners to regularly clean their hull bottoms and ensure they are properly antifouled (especially before moving to a new location), MPI is also urging owners to keep a sharp eye out for anything unusual in the water or on their hulls.

'If anyone sees any marine plants or sea life that looks out of the ordinary, please note its location, collect a sample if possible and contact us as soon as possible on 0800 80 99 66.'


by Lesley Patston

  

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http://www.sail-world.com/index.cfm?nid=117139

3:08 AM Fri 29 Nov 2013GMT


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