三峡水库受到强烈的人为调控的影响，库区因运行、防洪、调度等而引起的水文变动，势必影响库区生境条件的变化，也影响鱼类补充群体的生长和存活。目前，国内有关自然条件下鱼类早期生活史阶段存活机制的研究相对缺乏，无法行之有效的实施鱼类资源保护与恢复。本项目在受三峡水库调度运行影响的涪陵江段作为研究区域，采用多位点仔鱼采集，多尺度栖息地环境因子调查等技术，联合耳石日轮分析技术，对不同水文过程影响下圆筒吻鮈早期生长状况和早期生活史过程进行比较研究，并采用通用线性模型、因子分析等统计方法进行相关性分析和比较，从而辨识影响圆筒吻鮈早期生长与存活的关键因子。最终在此基础上，获得三峡水库调度运行对圆筒吻鮈早期群体存活的影响程度及其机制。研究结果将为三峡水库的调度方案提供理论依据。

The Three Gorges Reservoir (TGR) is strongly influenced by human regulation, the operation, flood control and dispatch of the TGR lead to significant changes in the physicochemical and hydrologic characters of the TGR, the changes influence the habitat and survival of fish recruitment in the TGR. However, with respect to fishes in the early life stage, a knowledge gap existed obviously between the survival mechanism research under nature condition and effective action aiming for the protection and restoration of fish resource. In this study, a research domain in Fuling reaches, which under hydrological control of the operation of TGR was chosen, using a combined method of larvae-sampling in multi-sites, habitat investigation in multi-scales, combining with otolith microstructure analysis, along with the linear model、factor analysis, for the correlation analysis and comparison to identify the key factors for influencing early growth and survival mechanisms of recruitment of Rhinogobio cylindricus in the TGR. The results are expected to provide a theoretical basis for the ecological operation of the TGR.