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2016年5月(养殖开始前)和2016年8月(养殖投饵高峰期)对大亚湾大碓鱼类深水网箱区、外围区(网箱外0.1 km)和非养殖区(网箱外10~15 km)的海水和沉积环境进行了调查,采用有机污染指数(A)法、营养状态质量指数(NQI)法对水环境进行评价,用潜在生态危害指数(RI)法对表层沉积物重金属潜在生态危害进行评价。结果显示,与传统网箱养殖化学需氧量(COD)由网箱区中心向四周递减的趋势不同,深水网箱养殖CODMn浓度在3个区域间无显著性差异。深水网箱养殖海域水质较好(A<1),水质处于贫营养水平(NQI<2)。深水网箱养殖海域表层沉积物重金属铅(Pb)和锌(Zn)含量均符合第一类海洋沉积物质量标准,但铜(Cu)和镉(Cd)含量轻微超标。沉积环境处于轻微生态危害状态(Eir<30,RI<100),与中国同类型海区相比,污染危害程度相对并不严重。深水网箱养鱼对周围海域环境的影响较小。
In May 2016 (before commencement of aquaculture) and in August 2016 (peak feeding season), the water area of Daya Bay Catfish deepwater cages, outlying areas (outside the cage 0.1 km) and non-cultured areas ~ 15 km), the organic carbon pollution index (A) method and the nutritional status quality index (NQI) method were used to evaluate the water environment. The potential ecological risk index (RI) Potential ecological risk assessment. The results showed that there was no significant difference in the concentration of CODMn cultured in deep-sea cages between the three regions, which was different from the trend of traditional COD depletion in cages. The water quality of deep-water cage aquaculture waters is better (A <1), and the water quality is at lean (NQI <2). The contents of Pb and Zn in surface sediments of deep-water cage aquaculture area all met the first class of marine sediment quality standards, but the content of copper (Cu) and cadmium (Cd) slightly exceeded the standard. Sediment environment is in a state of minor ecological risk (Eir <30, RI <100). Compared with the same type of sea areas in China, the degree of pollution hazard is relatively not serious. Fish in deep-water cages have less impact on the environment around the sea.