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通过研究太湖湖鲚的年龄结构、食物组成，结合太湖鱼类渔获量统计和环境检测资料，分析了1973-2002年间太 湖湖鲚渔获量变化的规律、原因及与生物环境间的相互关系．结果表明：1994年后湖鲚渔获量正以平均年增1430t 的速度 上升；种群中0~+个体占99．04±2．21%(2003年)、99．08±0．80%(2004年)；而0~+湖鲚主要以浮游动物为食，其中枝角 类占食物总个数的89．77．80±13．69%．分析发现：湖鲚渔获量与 TIN、TN、COD 间的正相关关系均达到显著水平；与翘嘴 红鲌、银鱼产量间的负相关关系达到极显著水平；种群低龄化趋势加剧与捕捞强度不断升高相一致；浮游动物现存量有随 湖鲚渔获量升高而降低的趋势．
By studying the age structure and food composition of Taihu Lake and analyzing the catch data of Taihu Lake and environmental monitoring data, this paper analyzes the regularity and reason of the change of catch of Taihu Lake from 1973 to 2002 and its relationship with the biological environment . The results showed that the catches of lakes were increased by 1430t on average after 1994. The numbers of 0 ~ + individuals in the population were 99.04 ± 2.21% (2003) and 99.08 ± 0.80% ( 2004), while 0 ~ + lakes mainly feed on zooplankton, in which the species of clams account for 89.77.80 ± 13.69% of the total number of food. The results showed that there was a significant positive correlation between the catches of Tuna, Tn, TN and COD, and significant negative correlations with the yields of red crested ibis and white croaker, and the trend of younger population was aggravated and harvested The intensity of the increase is consistent; zooplankton existing stock with the catfish catch increased the trend of declining.