In the article they more or less acknowledge it was the big ships that caused the issue, yet they want to penalise boaties and yachites when the horse has clearly bolted.
And you are right Harry, and in fact, they could close the Hauraki Gulf for a decade and the natural currents and wind changes would still embed the weed. It is a waste of time trying to fight it - I know what I am saying has been said before, but you just shake your head at some of the idiots out there that call for this banning thing.