Green macro-algae Sea lettuce which has bloomed due to nutrient inflow The algae has bloomed due to nutrient inflow from stormwater drains from an urban catchment, and secondary sewage effluent released in an inshore location of limited tidal flushing. Management of enclosed waters with a large urban catchment, requires special care with runoff water quality Bramble Bay, Moreton Bay Marine Park and Ramsar wetland, southeastern Queensland, Australia