新丰江水库欧洲鳗网箱养殖对水质的影响

Effects of Cage Aquaculture on Water Quality in Xinfengjiang Reservoir

网箱养殖欧洲鳗使养殖区及其周围水体中ＣＯＤ、总氮、总磷等污染物浓度明显升高，尤其大肠杆菌指标不能满足渔业水质标准，富营养化状态已达中营养化水平。网箱养鳗过程输入氮的６１．０％ ，磷的７７．４％ 都积留于库内，造成局部水域氮磷负荷已明显高于可接受负荷，磷负荷甚至接近危险负荷。

The concentration of pollutants such as chemical demand oxidation,total nitrogen,total phosphor,and so on significantly rises in and around the area of cage aquaculture,especially,E.Coli index may not meet the demand for GB11607 89.The trophic level in the area of cage qauaculture was in the mesotrophic status,while the trophic level around the area of cage aquaculture was in the transition state from oligotrophic to mesotrophic status.Eutrophication process has been significantly accelerated in and around the area of cage aquaculture.61.0 percent of input of nitrogen and 77.4 percent of input of phosphor from cage aquaculture have been accumulated in the reservoir,and this has caused loads of nitrogen and phosphor in partial water body having been significantly more than their acceptable loads,load of phosphor has been near to its advantageous load.