对主施化肥的５种不同处理的精养鱼池中主要饲养期间的叶绿素ａ及初级生产量每月进行测定。结果表明：浮游植物现存量为１４８７３—２４２２６μｇｃｈｌａ／Ｌ，平均为１８７５０μｇｃｈｌａ／Ｌ，初级生产量为１４７９—２０００ｇＯ２／ｍ２·ｄ，平均为１７８１ｇＯ２／ｍ２·ｄ，鲢鳙鱼产力为３１０５ｋｇ／ｈａ·ｄ。初级生产量与叶绿素ａ呈极显著正相关。施肥后叶绿素ａ的增长量与施肥时叶绿素ａ的起始量有关。叶绿素ａ往往在施肥后２—３天（２５℃以上时）或３—４天（２０℃以下时）达到峰值，尔后逐渐下降，并于施肥后第４—６天或６—８天回复到施肥前水平，因此，施肥周期以４—６天或６—８天为宜。本文还对主施化肥鱼池的鲢鳙鱼产力、适宜的Ｎ／Ｐ比值及氯化铵的肥效进行了讨论 Chlorophyll a and primary production during the main feeding period of the five intensively managed fish ponds mainly applying chemical fertilizers were measured monthly. The results showed that: the existing stock of phytoplankton was 14873-24226 μg chla / L, with an average of 18750 μg chla / L, and the primary production was 1479-2000 g  2 / m 2 · d, with an average of 1781 g  2 / m 2 · d, the silver carp and bighead carp productivity was 3105kg / ha · d. Primary production was positively correlated with chlorophyll a. The amount of chlorophyll a increased after fertilization was related to the initial amount of chlorophyll a during fertilization. Chlorophyll a often peaked at 2-3 days (above 25 ° C) or 3-4 days (below 20 ° C) after fertilization and then decreased gradually and returned to the first 4-6 days or 6-8 days after fertilization Pre-fertilization level, therefore, fertilization cycle to 4-6 days or 6-8 days is appropriate. The paper also discussed the productivity of silver carp and bighead carp, the suitable N / P ratio and the fertilizer efficiency of ammonium chloride