三峡水库运行后库区鱼类资源变化及保护研究

结合历史资料以及现状调查资料，分析了三峡库区形成后，库区江段鱼类资源变化的特征，以及造成库区鱼类资源变动的主要因素，并对库区鱼类所面临的主要生态环境问题进行了辨识。针对水利工程开发对鱼类生境造成的影响，提出了多种生态保护措施，如限制捕捞或全面禁捕、恢复洄游通道、栖息地生境保护等。指出大坝修建所导致的生境破碎化，是改变库区鱼类群落结构的重要因素；而不合理的人工捕捞是导致库区鱼类个体变小的直接原因。

Research on fish resources variation and protection in reservoir area of TGP after its operation

Combined with historical data and present investigation data,the variation characteristics of fish resources in the reservoir area of TGP and the main influential factors are analyzed,and the major faced eco-environmental problems of fish in the reservoir are identified.In view of the impact by hydropower development,some ecological protection measures are suggested to protect the fish resources in the reservoir area,such as fishing restriction or complete fishing prohibition,restoration of migration path and protection of ecology and environment of habitat,etc..It is pointed out that the fragmentation of ecology and environment caused by dam construction is the main factor to change the structure of fish community and unreasonable fishing by human beings is the direct reason that the fishes in the reservoir area become small.