张家口市东方红机械厂有四个废弃多年的冷却池,还有很多生活污水。自一九七七年以来,我们在这里开展了利用污水养鱼的试验。二年共捕鱼六千九百斤,其中七九年国庆节捕鱼四千三百斤,平均每个职工分得一斤多鲜鱼。养鱼亩产达到八百六十斤,这是目前我区坑塘养鱼最高的产量。 Zhangjiakou Dongfanghong Machinery Factory has four abandoned years of cooling pool, there are a lot of domestic sewage. Since 1977, we have experimented here with sewage water fish. In 2002, a total of 6,900 catties were caught, of which 43,000 were catches of fish during the National Day of 1979. The average number of fresh fish per pound was cut by each worker. Farming per mu reached eight hundred and sixty pounds, which is the highest pit fish production in our district.