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Here is an article about fan worm. https://researchspace.auckland.ac.nz/bitstream/handle/2292/58141/Brand-2022-thesis.pdf?sequence=4 When spawning events happen, the tides will move it considerable distances up and down the coast. Local boats are IMO only ever going to be a minuscule part of this issue. Are there really none at the Poor Knights? I'd be surprised, they are everywhere else along the northland coast....

Im sorry Zoe but Id be very confident that none of the recreational boats in Nz were responsible for bringing Fan Worm or calupera to NZ. And won't bring the sea star. The focus has to be on international shipping. I agree that we need to take responsibility to stop spread now that it is here but there needs to as much effort in allowing effective control by mandating appropriate antifouls. The current ones aren't really up to it.

There is a huge focus on international shipping - NZ has led the way on this so much so that other countries have followed suit. But there is also a focus on domestic boats because while the international boats might bring them here, it's the domestic boats that carry them around. https://www.marinepests.nz/our-defence-system It's outside my sphere of knowledge but Biosecurity NZ produce an interesting newsletter about this work that you might be interested in:

Not Delaware but relevant . Eradication techniques are further down the page . https://www.fisheries.noaa.gov/west-coast/habitat-conservation/caulerpa-species-west-coast Seems quite involved but surely no more expensive than holding meetings , hiring consultants or underwater companies to check boats . 100% they know the information above that took me 2 minutes to find and any other methods of eradication , so why feck around and find out ?

Live Sail Die shot of us in the Harbour Classic

Cruising the new boat on the one sunny day of xmas holiday

Bay Week day 2, just coming past Tapeka and preparing to drop kite. Max speed of 18.9kts on this blast 😎

How far back can we go?. I caught a fish.

Going back a few years.... Alaska in 2001 on Shaman. Kodiak island, Prince William sound, Kenai Pennisular and back down the inside passage through Juneau, ketchican and onto Seattle. Followed by a cruise down the west coast of the USA onto mexico and back to Hawai where I started the voyage.

Here we go

Mansion house bay multi raft up