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来源：百度知道 编辑：UC知道 时间：2024/05/01 23:55:45
为了分析巢湖的太湖新银鱼对资源的利用情况，于2007年8月、9月在4个采样点分别进行了调查，研究了太湖新银鱼的食物组成、同时还进行了寄生虫感染情况的调查，并结合历史资料分析了巢湖的太湖新银鱼产量变化的原因。结果表明：在8月份，桡足类是太湖新银鱼的主要食物，占食物个数组成比例的68.32±11.85%，其次是枝角类，占食物个数组成比例的27.77±10.11%，轮虫数量极少，仅仅占3.47±6.05%；在9月份，桡足类也是太湖新银鱼的主要食物，占食物个数组成比例的63.35±27.00%，其次是枝角类，占30.94±27.94%，轮虫仅占1.77±6.14%。分析认为，桡足类是巢湖的太湖新银鱼的主要食物，枝角类和轮虫是次要食物。为了分析巢湖的太湖新银鱼种群数量变化的原因，由历年鱼类渔获量统计资料表明，1989-2007年的19年间其渔获量维持在较低水平，平均为312±116 t，占总渔获量的3.80±1.47%，分析认为，近20年来其渔获量较低的主要原因是：富营养化加重导致环境中浮游动物数量减少，鲚鱼泛滥形成巨大食物竞争压力，这导致巢湖的太湖新银鱼以桡足类为主要食物，致使大量感染寄生虫使其生长减慢、怀卵量减少。
In order to analyse the Chaohu Lake Taihu new icefish the use of resources, in August 2007 and September in four sampling points respectively, conducted a survey to study the Taihu new icefish food composition, also a parasitic infection The survey, combined with historical data of the Chaohu Lake Taihu new icefish output change. The results showed that: In August, copepods in the Taihu Lake is the main food of new icefish, the number of food composition of the 68.32 ± 11.85%, followed by Chi Kok categories, the number of food composition of the 27.77 ± 10.11%, Rotifer number of very small, only accounting for 3.47 ± 6.05%; in September, copepods in the Taihu Lake is the main food of new icefish, the number of food composition of the 63.35 ± 27.00%, followed by Chi Kok category, accounting for 30.94 ± 27.94 percent, rotifer only 1.77 ± 6.14%. Analysis of that copepods in the Chaohu Lake Taihu is a major new sweet fish food, Cladocera and rotifer food is secondary. In order to analys