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Macroalgal blooms are increasing worldwide and have detrimental effects on near-shore ecosystems.However,the factors triggering such blooms are few-studied.Green blooms (i.e.Ulva spp.) close to a fish farm in the South China Sea were recorded.Benthic macroalgal community and environmental variables were measured to investigate the changes along a natural gradient from the outlet of a fish farm and to examine the main causes for the algal blooms.