Grid use appear to be banned around NZ except for a very light rub with a sponge, Whatever is attached to the hull must be removed and captured to a sludge tank.
I wonder if any of the folk proposing and enforcing this sort of official behaviour have ever watched a mussel harvester in action, the amount of mud, marine debris, fan worms (perhaps) etc. etc. that are gushing off the harvester back into the sea are exactly the same as could be hanging off the bottom of any yacht on the grid, With perhaps a smidgen of antifoul that might be removed in the cleaning process. Given that the dumbe