长江流域资源与环境 >> 2010, Vol. 19 >> Issue (03): 276-.

• 自然资源 • 上一篇    下一篇

长江上游宜宾江段长鳍吻鮈种群资源量的估算

 刘 军, 王剑伟, 苗志国, 曹文宣   

  1. (中国科学院水生生物研究所, 湖北 武汉 430072)
  • 出版日期:2010-03-20

ESTIMATION ON ABUNDANCE OF 〖WTHX〗RHINOGOBIO VENTRALIS〖WTHZ〗 IN YIBIN REACH OF THE YANGTZE RIVER

LIU Jun,WANG Jianwei,MIAO Zhiguo,CAO Wenxuan   

  1. (Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China)
  • Online:2010-03-20

摘要:

1998~2002年,对宜宾柏溪与云南水富县交界处至柏溪二二四大桥之间全长约17 km的江段,进行了渔船作业情况和渔获物采样调查统计。在此基础上推算出该江段长鳍吻鮈年渔获量,再采用渔获物体长股分析方法对该江段长鳍吻鮈种群资源量进行了估算,以期为以后监测和评价三峡工程对鱼类尤其是特有鱼类资源的影响提供基础资料。研究结果表明:1998~2002年宜宾江段年总渔获量(〖WTBX〗Y〖WTBZ〗)分别为315 718、732 873、591 337、569 402和611 858尾;相应的长鳍吻鮈年渔获量分别为39 219、22 528、24 458、39 743和13 845尾。1998~2002年宜宾江段长鳍吻鮈年资源量依次为75 162、22 594、49 951、43 308和21 996尾,多年平均为42 602尾,95%置信区间为23 300~61 903尾.

关键词: 长鳍吻鮈/资源量/体长股分析/长江宜宾江段

Abstract:

Aimed to provide background information of the effects of the Three Gorges Project on endemic fish resources of the upper reach of the Yangtze River,the assessment on the annual abundance of Rhinogobio ventralis in Yibin Reach of the Yangtze River was undertaken.The research reach was from the edge of Yibin County and Shuifu County to Erersi Bridge of Yibin with the length of 17 km.From 1998 to 2002,the information of fishing effort in Yibin reach of the Yangtze River was collected,and the data of commercial fisheries in this reach were sampled.Initially the total annual harvest yield (Y) was estimated by the parameters which obtained through commercial fisheries surveys,such as annual fishing efforts and CPUE.Then,the annual yield of R.ventralis was counted according to its quantitative ratio in sampling.The parameter of L∞ and k was from relative references;the parameter of M was calculated by the Pauly's method.The exploit rate (Et) of maximum length group was set at 0.8. Finally,by applying Jones lengthbased cohort analysis,the annual abundance of R.ventralis  was calculated.The results were showed as follows:from 1998 to 2002,the total annual yield (Y ) was 315 718,732 873,591 337,569 402 and 611 858 individuals respectively;accordingly,the annual yield of  R.ventralis was 39 219,22 528,24 458,39 743 and 13 845 individuals,respectively.From 1998 to 2002,it was estimated that the annual abundance of R.ventralis was 75 162,22 594,49 951,43 308 and 21 996 individuals respectively with an average of 42 602 individuals.The 95% confidence interval of annual abundance of  R.ventralis  ranged from 23 300 to 61 903 individuals.
 

Key words: Rhinogobio ventralis/abundance/lengthbased cohort analysis/Yibin Reach of the Yangtze River

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