Mediterranean fanworms have been found at Gisborne’s port in a recent survey of marine pests.

Biosecurity divers from Bay of Plenty Regional Council found two fanworms on port structures during their twice-yearly survey, while a vessel that had returned from the Coromandel area was also found to have another two fanworms attached to the hull.

The vessel was taken from the marina to have its hull cleaned.

Council environmental and science manager Lois Easton said it was disappointing to have more fanworms arrive on another vessel.

“Any boat owner who arrives in Gisborne district waters is required by the Regional Pest Management Plan to be sufficiently cleaned and antifouled so that they have no more than a slime layer on the hull.

“As well as having a high environmental risk, Mediterranean fanworm presents a very significant threat to the crayfishery in Gisborne. Council has worked jointly with the Ministry of Primary Industries to fund an eradication programme for fanworm in Gisborne Port and has spent nearly $100,000 in this exercise. It is disappointing to have that work put at risk by thoughtless behaviour.”

Mediterranean fanworm is widespread in the Waitemata Harbour but the rest of the country is trying hard to stop its spread into their waters.

Council is working with regional councils in the northern part of the North Island on a partnership that is expected to lead the requirement for a Marine Biosecurity Passport to be introduced.

This will help track local boat movements and ensure they are keeping a good standard of hull cleanliness to prevent the spread of pest species.

Fanworm is found mainly in ports or estuaries in 1m - 30m deep water, attached to a range of surfaces in varying environmental conditions.

Its fast growth rate and prolific breeding habits make it likely to out-compete other species and interfere with biological processes.

ENDS

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