长江口是我国经济鱼类的重要渔场，该水域的经济鱼类不但品种丰富，而且产量十分可观。近年长江口两岸工业发展迅速，排放长江的排污口逐年增加，污染了长江口，对渔业有所影响。此外，随着航运业的发展，石油污染和船舶废水废油，污染水质也日益严重【王幼槐等，1983】。为了 The Yangtze Estuary is an important fishery for China’s economic fish. The economic fish in this area are not only rich in variety, but also yield a considerable amount. In recent years, the development of industries across the Yangtze River Estuary has been rapidly developed. The discharge of pollutants from the Yangtze River has been increasing year by year, contaminating the mouth of the Yangtze River and affecting fisheries. In addition, with the development of the shipping industry, oil pollution and marine waste oil have also become increasingly polluted. Wang Youhuai et al., 1983]. in order to