中文摘要：

为了解长江上游特有鱼类圆口铜鱼（Coreius guichenoti）的种群数量及分布,2007~2009年对江津和宜宾江段的渔业捕捞情况及渔获物组成进行了调查,根据单位捕捞努力量渔获量对该江段的年渔获量进行了统计分析,采用FISATⅡ渔业评估软件中体长股分析模块对圆口铜鱼的资源量进行了估算。2007、2008和2009年,江津江段鱼类年总渔获量分别为267 850、689 975和586 575尾,宜宾江段鱼类年总渔获量分别为485 100、108 075和169 950尾;其中,江津江段圆口铜鱼的年渔获量分别为56 932、98 323和100 620尾,宜宾江段圆口铜鱼的年渔获量分别为66 099、16 952和32 812尾。渔获个体主要分布在80~220 mm体长组。估算出2007~2009年江津江段圆口铜鱼年资源量分别为319 416、905 715和1 124 470尾,年均值为783 200尾;以质量计,年资源量分别为25.33、129.72和244.48 t,年均值为133.18 t。宜宾江段圆口铜鱼年资源量分别为469 395、191 207和200 197尾,年均值为286 933尾;以质量计,年资源量分别为60.18、43.11和15.14 t,年均值为39.48 t。以上结果表明,长江上游江津江段圆口铜鱼年均资源量大于宜宾江段;2007~2009年宜宾江段圆口铜鱼资源量呈下降趋势,而江津江段圆口铜鱼资源量呈上升趋势。

英文摘要：

The upper reaches of the Yangtze River posses many endemic and rare fish species. It is one of the key regions of biodiversity protection in China. Coreius guichenoti is an endemic species in the upper Yangtze River,and is a common migratory species between the lower and the upper reaches of the channel. In relatively recent years,the construction of large hydroelectric projects may have impeded the migratory route taken by C.guichenoti. This has led to concern about how the population dynamics of the species could be affected. In order to better understand the population abundance and distribution of C. guichenoti,investigations were performed on fishing and catch composition in Jiangjin and Yibin sections of the Yangtze River in 2007- 2009. The annual yields were analyzed based on the catch per unit effort,and the stocks of C. guichenoti were assessed by length-structure virtual population analysis in the software package of FISAT. The results showed that the totalannual yield in Jiangjin section in 2007,2008 and 2009 was 267 850,689 975 and 586 575 individuals and that in Yibin section was 485 100,108 075 and 169 950 individuals,respectively. The annual yield of C. guichenoti in Jiangjin section was 56 932,98 323 and 100 620 individuals and that in Yibin section was 66 099,16 952 and 32 812 individuals,respectively. The catch was dominated by individuals of 80- 220 mm in length. From2007- 2009 the evaluated annual abundance of C. guichenoti in Jiangjin section of the Yangtze River was319 416,905 715 and 1 124 470 individuals respectively, and the annual average value was 783 200 individuals. The annual weight was 25. 33,129. 72 and 244. 48 t. The average value over these three years was133. 18 t. The annual abundance of C. guichenoti in Yibin section over the same time period was 469 395,191 207 and 200 197 individuals,and the annual average value was 286 933 individuals; the annual weight was60. 18,43. 11 and 15. 14 t,and the annual average value was 39. 48 t. It was concluded that the stock of C.guichenoti i