Biosecurity New Zealand disappointed over caulerpa seaweed find in Hauraki Gulf

By RNZ Biosecurity New Zealand plans to take immediate action against a pest seaweed discovered around Kawau Island in the Hauraki Gulf. It said divers found small patches of exotic caulerpa seaweed in the north channel, northwest of the island. Biosecurity NZ director of response services John Walsh said it was disappointing but not unexpected, given how easily the seaweed can spread. Walsh said discussions over the latest find had begun with the Ngāti Manuhiri Settlement Trust and Auckland Council. "With their agreement, we plan to begin some control work as soon as possible as well as further surveillance in the area," he said. Biosecurity New Zealand was considering the use of chlorine pellets beneath tarpaulins, a method being tested in the Bay of Islands by Northland Regional Council, or suction dredging to remove the seaweed, Walsh said. Efforts have been under way for two years to get rid of the plant at Aotea Great Barrier Island, Ahuahu Great Mercury Island and Te ...