“三北(东北、西北、华北)”地区水产技术协作组1990年年会于去岁末召开。会议总结了“七五”工作成绩和经验。在“七五”期间,“三北”水产技术协作组的上作,主要以提高池塘养鱼技术水平为主,重点推广了北京市池塘养鱼高产模式及其经验,使“三北”地 The annual meeting of the “Three Norths (Northeast, Northwest, North China)” Regional Aquatic Technical Cooperation Group was held at the end of last year. The meeting summed up the “Seventh Five-Year” achievements and experience. During the “Seventh Five-year Plan” period, the “Three Norths” aquaculture technical cooperation group mainly focused on raising the level of fish farming technology in ponds and focused on promoting the high-yielding pattern of pond fish culture in Beijing and its experience so that the “Three Norths”