京郊十万余亩淡水商品鱼基地都是在八十年代开挖建成,已具有十几年以上的场龄,经过长期高密度养殖,加上生产上的短期行为,导致池塘常年失修,鱼池池埂坍塌损坏严重,池底沉积很厚淤泥,使鱼池变得越来越浅,减少水体容积,影响产量提高。另一方面因池底淤泥病原体大量滋生,病害增多,加大防病治病药费开支,增加了开增氧机时间,加大了生产支出,导致养 More than 100,000 acres of fresh water commodity fish base in the suburbs are built in the eighties excavation, has more than ten years of field age, after long-term high-density farming, coupled with short-term production behavior, resulting in perennial disrepair of the pond, fish pond Pool collapse collapse serious damage, sediment deposition thick mud on the bottom, making the pond more and more shallow, reducing the volume of water, affecting the yield increase. On the other hand due to the large number of bottom sediment pathogens breeding, increasing disease, increase prevention and treatment costs, increased oxygen machine open time, increased production costs, resulting in raising