京郊12万亩池塘,近千个淡水商品鱼基地,大部分是从1984年陆续开挖建成,至今已有十多年。由于在饲养管理中大量投饲、施肥,加之塘埂坍塌冲刷流入池中。目前鱼池严重老化淤泥淤积很厚,据测算,鱼塘每年池底大约要增加10公分左右厚的淤泥。由于年久不清淤带来后果,一是鱼塘变得越来越浅,影响产 The suburbs of 120,000 mu of ponds in the suburbs, nearly 1,000 freshwater fish base commodity, most of them were built from 1984 after excavation, has been more than 10 years. As a result of feeding a large number of feeding and management, fertilization, combined with the collapse Tong Tang erosion into the pool. At present, the siltation of muddy silt is very serious in the fish ponds. It is estimated that the pond bottom will increase about 10 centimeters thick mud each year. As a result of long-term non-destructive consequences, first, fish ponds become more and more shallow, affecting production