Four treatments were used; 1) no urchins; 2) no urchins, abalone and limpets; 3) no abalone or limpets; 4) control. These were done in quadruplicate for 16 squares (10 m x 7.5m) divided by 50cm high netting. There were two blocks of four squares each on each side of the island with randomly allocated treatments. Ten Macrocystis plants were introduced to each of the squares. Juvenile plants (0.2-1.0m high) were obtained from Dodges Ferry, kept moist under hessian sacks and within 24 hours of harvest, replanted at Hope Island in June 1994. Individual plants were attached to bricks using rubber bands over the haptera at the base of the plant.
Lack of propagule supply was likely the main cause for minimal revegetation.
Two years post-transplantation, an area that was regularly cleared of urchins outside treatment areas still did not have significant vegetation coverage. It is likely that the lack of vegetation was due to a lack of algal spores.