南汇县水产养殖场,是以养鱼为主,兼养奶牛、生猪和河蚌育珠的淡水养殖场。现有鱼塘74只,水面450亩。以往,成鱼生产主要饲喂城市大粪。但由于城市居住卫生设备的改善,大粪质量逐年下降,成鱼亩产始终徘徊在七、八百斤左右。 1972年以来,该场饲养了奶牛,利用牛粪喂鱼,亩产提高到千斤以上,特别是牛舍东边一只10亩水面的高产塘,平均亩产成鱼2500斤。几年来,既发展了奶牛生产,又促进了鲜鱼上市量,为城市副食品生产作出了贡献。利用牛粪养鱼有以下几点好处: 一、施用牛粪的池塘,水质比较稳定,不易泛池,施肥容易掌握,肥力持久,和大 Nanhui County aquaculture farms, mainly fish farming, and dairy cows, pigs and freshwater mussels Pearl mussel farm. The existing 74 fish ponds, 450 acres of water. In the past, adult fish production was mainly fed to urban manure. However, due to the improvement of sanitary facilities in urban areas, the quality of droppings has been declining year by year, and the per-mu yield of adult fish has been hovering at around seven or eighty catties. Since 1972, the farm has raised cows and cow dung to feed the fish. The yield per mu has been raised to over one kilogram. In particular, a 10-mu high-yielding pond east of the cowshed produces an average of 2,500 kilograms of fish per mu. In recent years, both the development of dairy production, but also promoted the amount of fresh fish to market, contributed to the city of non-staple food production. The use of cow dung fish have the following advantages: First, the application of cow dung ponds, water quality is relatively stable, not easy pan, fertilizer easy to grasp, fertility lasting, and large