Sabella spallanzanii (Mediterranean fanworm), was first detected at Lyttelton Port in 2008. S. spallanzanii is designated an Unwanted Organism under the Biosecurity Act, 1993. The species poses risks to New Zealand’s native biodiversity and aquaculture industry.
Biosecurity New Zealand (BNZ) stood up a response to the Lyttelton incursion. In 2009, S. spallanzanii was detected in Auckland, some 1,500km to the north and response activities were also undertaken there. However, S. spallanzanii was found at other Auckland locations and the national response was closed out in 2010. From 2012 onwards, S. spallanzanii began spreading to other locations.
In New Zealand, Sabella forms dense colonies in a range of subtidal marine habitats. It’s ability to settle on vessel hulls has most likely facilitated spread to new locations via vessel traffic.
Since 2012, BNZ has formed partnerships with local councils to attempt elimination of the new incursions, with the aim of slowing the spread of S. spallanzanii. The partnerships have helped to build capability and raise awareness about the spread of marine pests on vessel hulls. Importantly, several of the incursions have now been eliminated.