华北、东北、西北地区近年淡水养殖业迅速发展,成绩显著.但是,这些地区由于气温低,批量自产鱼苗困难,即使少量生产,也成本高,时间晚,当年培育的鱼苗难以度过漫漫寒冬,幸存部分需三年才能养成商品鱼.而从长江流域运进鱼苗,两年时间即可养成商品鱼,明显地缩短了时间,提高了效益。“三北”地区距离长江流域鱼苗产地遥远,用汽车、火车运输鱼苗时间太长,难以保障成活率,民航运输也远远不能满足需求,为解决“南苗北运”的燃眉之急,供求双方纷纷登门空军驻汉部队,请求支援。空军部队十分重视这一问题,几年来,每至五、六月,便增派飞行任务,装机起运鱼 In recent years, the freshwater aquaculture industry in North China, Northeast China and Northwest China has witnessed rapid development with remarkable achievements. However, due to the low temperature and the difficulty of producing fish fry in batches in these areas, the production of fish fry in these areas is difficult and costly even in small quantities. , The surviving part takes only three years to develop the commercial fish, while the fish fry can be brought in from the Yangtze valley for two years to produce the commercial fish, which obviously shortens the time and improves the efficiency. The “Three Norths” region is far away from the fry of the Yangtze River. The fry transport by car and train is too long to guarantee the survival rate, and the civil aviation transport can not meet the demand. In order to solve the urgent needs of the “South Miao and North Yun”, both the supply and the demand Air force stationed in Han troops, for support. Air Force troops attach great importance to this issue. In recent years, every five or six months, they have been assigned additional missions.