一、一九九四年“三北”协作组的主要工作。 1、大银鱼移殖工作由点扩大到面。 94年大银鱼移殖点不断增多,面继续扩大,效果越来越明显。例如,北京市密云水库93年底和94年初投放大银鱼受精卵4600万粒,预计能形成大银鱼资源500吨;天津市在五座水库移殖大银鱼,年产大银鱼100吨;山东省九四年在八个地区、十五个县市二十 First, the main work of the “Three Norths” cooperation group in 1994. 1, silverfish migration work expanded from the point to the surface. 94 years of large silverfish migration points continue to increase, continue to expand the surface, the effect is more obvious. For example, Beijing Miyun Reservoir put 4600 million fertilized eggs of big silverfish at the end of 93 and early 94, and it is expected to form 500 tons of big silverfish resources. Tianjin Municipality has transplanted large whitebait in five reservoirs with an annual output of 100 tons of big whitebait ; Shandong Province in 1984 in eight regions, fifteen counties twenty