太湖人工放流鲢、鳙效果的研究

本文分析了1992年和1993年度太湖人工放流鲢、鳙以后的捕捞产量、生长速度和肥满度等指标。1992年太湖鲢、鳙鱼种的放流量为923×104尾，252．16t．该年鲢、鳙捕捞产量为1379．71t，占全湖捕捞总产量的9．99％。1993年2种鱼的放流量增加为1132×104尾，354．24t，捕捞产量上升为1670．10t，占全湖捕捞总产量的11．87％。1984年以来，十年间放流鲢、鳙鱼的年平均产量达1450．8t，已接近五十年代鲢、鳙天然资源渔产量的最高记录。表明太湖人工放流鲢、鳙取得了明显的效果，对稳定和提高太湖鱼产量有积极作用，在调整和改善太湖水产资源的合理结构方面也有积极的意义。根据太湖的环境条件、浮游生物的丰盛程度和鲢、鳙的生长速度和肥满度等指标的分析，认为鲢、鳙还有增产的潜力，还可适当增加放流量。

EFFECT OF ARTIFICIAL STOCKING OF SILVER CARP AND BIGHEAD IN LAKE TAIHU

This paper reports the relationship between artificial stocking and yield of silver carp and bighead in Lake Taihu in 1992 and 1993. A total amount of 9. 23 million fingerlings (weighed 252. 16 tons ) of silver carp and bighead together were stocked into Lake Taihu in 1992. About 1379. 71 tons of silver carp and bighead were caught in this year.It occupied 9. 99% of total catch of Lake Taihu's fisheries. in 1993. the stocking quantity and stocking weights were increased to 11.32 million fingerlings and 354. 24 tons respectively. The yield of silver carp and bighead was also increased to 1670. 1 tons. It occupied 11. 87% of total catch from Lake Taihu of this year. The major effect of artificial stocking of silver carp and bighead in Lake Taihu was obtained in these .two years. The results have positive role for stabilizing and increasing yield in the Lake Taihu's fisheries and active significance for regulating and improving structure of . fisheries resources of Lake Taihu. There is potential for increasing production of silver carp and bighead according to the environmental conditions, abundance of plankton and growth performences of these two species, the stocking density could be increased further. The factors affected on stocking effect are discussed.