Pollution and hazard of dicofol in fishery environment

China is the largest country of fishery production and an important fishery exporter in the world. The support of national policy and improvement of production technology greatly facilitated the development of fishery industry. However, due to the expansion of foreign trade and people's increasing concern to food safety, many countries have established strict regulations for limiting drug residue in aquatic products to improve the quality of fishery environment. Relevant basic researches in this field have been being the focus both home and abroad for several decades. As the substitute of DDT, dicofol has been paid great attention to by scholars since it came out. Its high effectiveness to acarid but lower toxity to rodent contributed to good crop harvests. Nevertheless, dicofol is highly toxic to aquatic organisms and the hazards of its residue in environment are being more obvious gradually. The paper reviews the studies of dicofol pollution, such as environmental behavior in water, biological impact and safety of fishery products, and finally the research tendency and focus in the future are summarized.