Because of the Bay Management Area Plan, put in place to create a fallowing period and contain diseases, only 2/3 of the sites (i.e. 64 sites) are active in any given year. If each site was designed to have eight seaweed rafts (38 ropes of kelps, 35 m long and supporting a biomass of 15 kg/m), there would be 512 rafts producing 10 214.40 tonnes fresh weight (FW) of seaweeds. With an average of 0.35% nitrogen content in FW kelp tissues, the harvesting of kelps would equate to the removal of 35.75 tonnes of nitrogen from the ecosystem per year.