三峡库区春季鱼类组成及分布特征

为了解三峡库区春季鱼类分布特征,于2007年至2009年每年春季分别采用HTI Model241和SIMRADEY60鱼探仪对三峡库区秭归至重庆江段进行了声学调查,并于2008年和2009年春季对巫山、忠县和长寿江段的渔获物进行了调查。声学调查显示:鱼类在秭归至重庆段分布不均匀,基本表现为从三峡库区的下游到上游密度越来越大,并且春季鱼类喜居于上游长寿至重庆的几处江段。渔获物调查显示:巫山江段优势种为鲢(Hy-pophthalmichthys molitrix),忠县江段优势种为鲢、南方鲶(Silurus meridionalis Chen)和鲤(Cyprinus carpio Linnaeus),长寿江段优势种为铜鱼(Coreius heterokon)。结果表明三峡库区春季鱼类的分布特征和渔获物优势种的生活习性密切相关。

Composition and distribution of fish in spring in the Three Gorges Reservoir

In order to understand the fish composition and distribution in spring in the Three Gorges Reservoir,hydroacoustioc survey was conducted in every spring from 2007 to 2009 by two kinds of split-beam echosounder HTI Model241 and SIMRAD EY60,and fish catch was also surveyed in Wushan section,Zhongxian section and Changshou section.The results showed that fish distribution in horizontal direction was uneven and fish density increased from lower reach of the reservoir to upper reach.In spring,fish density in the section from Changshou to Chongqing was the highest.The fish catch result showed that dominant species in Wushan section was silver carp,in Zhongxian section were silver carp,southern catfish and carp,in Chongshou section was copper fish.The fish distribution in the Three Gorges Reservoir was closely related to the living habit of the dominant species in different sections.