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《Fisheries Science》 2018-04
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Distribution of Nitrogen and Phosphorus in Waters of Freshwater Aquaculture in Shanghai

SUN Zhenzhong;LIU Jinjin;ZHANG Yuping;Shanghai Fisheries Research Institute;  
Water quality of inlet water and pond water in representative aquafarms had been monitored in order to investigate the pollution status of nitrogen and phosphorus in freshwater aquaculture in Shanghai.The results showed that the annual average concentrations of total nitrogen(TN)and total phosphorus(TP)were 2.53 mg/L and 0.294 mg/L,respectively,without significant difference in TN concentration between the inlet water and pond water.The annual average concentration of TP was 0.370 mg/L in the pond water,significantly higher than that in the inlet water.The average concentrations of TN and TP in the fish ponds were found to be higher than those in Pacific white shrimp Litopenaeus vannamei ponds,and the minimum in Chinese mitten handed crab Eriocheir sinensis ponds.The proportion of organic nitrogen and organic phosphorus in TN and TP increased as aquaculture proceeded,and the same case in the ratio of ammonium in total inorganic nitrogen.The concentrations of TN in the inlet water were higher in spring and winter than those in the other two seasons,and the phosphorus content increased in summer and winter.Contents of nitrogen and phosphorus in the fish ponds were higher during the late culture period due to the organic matter accumulation.The relative higher concentrations in Pacific white shrimp ponds was observed in the prophase due to higher water fertility.TN concentrations in the Chinese mitten handed crab ponds were decreased gradually during the aquaculture production.There was comprehensive pollution index of over 1.0 in more than 70% of the inlet water,so the quality of the inlet water for freshwater aquaculture in Shanghai was not optimistic.Overall,the freshwater fish aquaculture aggravated the water pollution,while this situation in the Pacific white shrimp and Chinese mitten handed crab ponds was not significant.
【Fund】: 上海市科技兴农重点攻关项目[沪农科攻字(2015)第6-3-3号];; 2016年度上海市水产研究所青年人才成长计划[沪农青字(2016)第3-3号]
【CateGory Index】: S912
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