Based on nutrient data from eight monitoring stations in Sanggou Bay during spring,the distribution characteristics and changes of nutrients in seawater were analyzed and compared with historical materials.The concentration variation of dissolved inorganic nitrogen(DIN),total nitrogen(TN),active phosphate(PO3-4)and total phosphorus as well as their relationships were observed.In addition,the pollution contribution rate of shellfish farming wastewater was estimated.The results showed that mean concentration ...