江苏省盐城市郊大纵湖乡,有2.6万亩湖荡和低洼荡滩。为了探索提高湖荡养鱼经济效益的途径,他们选择了三种养殖形式作对比。第一种是开挖精养鱼塘。在第三养殖场,投资71万多元,将1450亩低洼荡滩,挖成35个(402亩)精养鱼塘,每亩平均投资1766元,每亩饲养成本(包括饲料费,下同)180元,平均亩产鱼1250斤。第二种是筑堤围滩放养。在第一养殖场,投资12万元,在600亩湖荡中修筑圩堤,圩内养鱼。每亩平均 Yancheng City, Jiangsu Province, a large Longhu Township, 26000 acres of lake and low-lying swing beach. In order to explore ways to increase the economic benefits of swiming fish in the lake, they selected three forms of culture for comparison. The first is to excavation and intensive fish ponds. In the third farms, more than 710,000 yuan investment, 1450 acres of low-lying swing beach, dug into 35 (402 acres) intensive fish ponds, an average investment of 1766 yuan per mu, per mu farming costs (including feed costs, the same below ) 180 yuan, the average yield of fish 1250 pounds. The second is the embankment beach stocking. In the first farm, invest 120,000 yuan, 600 acres of lakes built dike dike, dike fish. Average per acre