Suction dredging is about to begin in a battle against a highly invasive seaweed taking hold at Aotea Great Barrier Island.
The caulerpa seaweed is capable of growing up to 3 centimetres a day.
It was discovered on the island around two years ago and can be devastating for biodiversity and fish numbers.
University of Otago director of the Aquaculture and Fisheries Programme Professor Chris Hepburn spoke to Ingrid Hipkiss.
