本文报道了１９９５年６－９月间对海水施肥鱼虾混养受控围隔生态系中浮游纤毛虫的种群增长和生产量估测结果。纤毛虫的种群增长率和世代时间是通过原位试验所得。养殖期间（温度为２２．６－２９．７℃）优势种具沟急游虫（Ｓｔｒｏｍｂｉｄｉｕｍｓｕｌｃａｔｕｍ）世代时间为６．５４－１９．８０ｈ其种群增长率为０．０３５－０．１０６ｈ－１；其种群增长受温度和食物量的影响。该围隔浮游纤毛虫累计日均产量为１００６．３４ｍｇ·ｍ－３ｄ－１。按月计算的日Ｐ／Ｂ为０．５４－２．４８。 This article reports the population growth and production estimation of planktonic ciliate in the controlled confinement ecosystem for seawater fertilization in June-September 1995. Ciliates’ population growth and generational times are derived from in situ experiments. During the breeding period (temperature 22.6-29.7 ℃), the dominant species of Strombidium sulcatum grew at a rate of 0.035-0.106 h-1 for a generational time of 6.54-19.80 h. Population growth is affected by temperature and amount of food. The accumulated average daily production of planktonic ciliates was 1006.34 mg · m-3d-1. The monthly P / B calculated on a monthly basis is 0.54-2.48.