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Ongoing surveillance for fanworm in Waikawa Marina

Mediterranean fanworm is a significant threat to local marine ecosystems; it can form dense colonies that can outcompete native species for food and space, and can impact commercially important species such as mussels, oysters and scallops. Two fanworms were discovered in the marina in March 2024, the first detection of Mediterranean fanworm in the marina since May 2019. Following this initial find, dive contractors have conducted regular surveillance and discovered several more instances of fanworm, with the most occurring in September. The regular surveillance undertaken by dive teams is critical for protecting the Top of the South’s marine environment.  

One notable incident was the discovery of 17 fanworms on the hull of a large yacht in early September. Despite being lifted and cleaned before it left Auckland, a few small areas had poor antifouling from being in the cradle or blocks when it was coated, and it was reinfested with fanworm before it left. The vessel was promptly hauled and cleaned. This incident is a good reminder for boat owners to ensure their hull is properly cleaned before heading out.  

mediterranean fanworm sabella spallanzanii tos marine biosecurity