北京市1989年淡水鱼又获丰收,产量超过1800万公斤,比去年净增700万公斤,自改革开放以来,10年间淡水鱼产量翻了几番,产量的提高一靠政策、二靠技术。1958年只有500万斤,市水产科研所成立后,首先突破了四大家鱼在北方人工孵化的难题,使产量大幅度增加。近年来 Freshwater fish have also been bumper in 1989 in Beijing, producing more than 18 million kilograms, a net increase of 7 million kilograms over the previous year. Since the reform and opening up, the output of freshwater fish has doubled in 10 years and the output has been boosted by policies and by technology. Only five million jin in 1958, the city aquatic research institute was established, first of all broke through the four fish in the northern artificial hatch problem, so that production increased significantly. In recent years