鱼类洄游

鱼类行为的研究是搞清鱼类洄游路线、提高捕捞效率、保护渔业资源的重要基础。

The purpose of studying fish behavior is to find out fish migration routes and improve capture efficiency , which gives an important foundation for the protection of fishery resources .

在此基础上提出了长江流域鱼类洄游通道恢复的对策：制定鱼类洄游通道恢复规划；

Based on the analysis , four main measures for restoring passage for migratory fish are proposed : ( a ) develop program of restoring fish passage ;

美国政府最终拒绝拆坝，认为拆坝不是促进鲑鱼洄游所必须的，采取其他工程措施同样能改善鱼类洄游条件。

The Clinton and Bush Administration refused to breach these dams successively regarding that dam removal is not essential to improving salmon runs and other methods can also achieve this object .

自20世纪30年代起，美国陆军工程师团建设并运行哥伦比亚河及斯内克河下游的8座梯级水电站，这些水电站通过各种工程措施维持鱼类洄游通道。

Since 1930s the US Army Corps of Engineers has built and operated a string of 8 hydropower stations along the lower Columbia and Snake River and adult and juvenile salmon passages are maintained with various measures .

不利影响主要是水库淹没损失和移民安置环境影响，大坝阻隔洄游性鱼类洄游通道，淹没库区鱼类产卵场、工程施工对梧州市水源地的影响以及产生的水土流失等。

The unfavorable influences include reservoir inundation losses , environmental influence resulting from inhabitant resettlement , the return channel of migration fish being cut off by the dam , submergence of fish spawning yard , affecting the water source of Wuzhou city and soil erosion caused by project construction etc.

联合国跨界鱼类种群和高度洄游鱼类种群会议最后文件；

Final act of the United Nations Conference on straddling fish stocks and highly migratory fish stocks ;

养护和管理公海跨界鱼类种群和高度洄游鱼类种群公约草案；

Draft Convention on the conservation and management of straddling fish stocks and highly migratory fish stocks on the high seas ;

定居型鱼类占50.7%，洄游型鱼类48.0%，河口型鱼类1.3%；

The settling species , the migratory species and the estuarine species account for 50 . 7 % , 48.0 % and 1.3 % .

4属，其中土著纯淡水鱼类5种，洄游鱼类11种，河口鱼类26种，外来鱼类14种。

There are 102 kinds of freshwater fishes , belonging to 34 families 84 genus , among which there are 51 kinds of original inhabitant fishes , 11 kinds of migration fishes , 26 kinds of estuarine fishes and 14 kinds of outside fishes .