研究显示养殖食用鱼体内多氯联苯(polychlorinated biphenyls,PCBs)的浓度水平高于野生鱼,然而目前国内外涉及PCBs在淡水养殖鱼塘迁移规律的研究还非常少.珠江三角洲是我国淡水养殖的重要地区,弄清鱼塘生态系统中PCBs的主要污染源和输入途径,可为相关污染物治理,降低或消除水产品中的PCBs残留量提供理论依据. Studies have shown that the concentration of polychlorinated biphenyls (PCBs) in cultured fish is higher than that of wild fish, however, there are still few studies on the migration of PCBs in freshwater fish ponds at home and abroad.Pearl River Delta Important areas, to clarify the main sources of pollution and input channels of PCBs in fish pond ecosystems provide a theoretical basis for the treatment of related pollutants, reduce or eliminate PCBs residues in aquatic products.