草鱼作为我国著名的四大家鱼之一，是长江流域产漂流性卵鱼类的典型代表，其自然繁殖过程与河流流量、流速、水温等有着密切的关系，但具体的生理学机制尚不清楚。随着长江上游梯级开发的持续推进，河流中下游鱼类自然繁殖过程将受到显著的影响。因此，迫切需要就关键环境因子对鱼类自然繁殖的作用机制展开深入研究。本项目以繁殖期草鱼为研究对象，通过野外现场观测与室内实验相结合的方法，深入分析水温和流速对繁殖期草鱼性类固醇激素分泌的作用机制，阐明不同环境条件下繁殖期草鱼性类固醇激素的变化规律，以期为我国大型水利工程生态调度和河流生态修复提供科学依据。

Grass carp as one of the famous domestic fish in China, is a typical representative of fish with pelagic eggs in Yangtze River, its reproduction process had close relationships with discharge、water temperature and velocity, but the specific physiological mechanism is unclear. However, with the cascade development of the upstream of Yangtze River, the reproduction process in the lower reaches was seriously affected, and it poses a serious threat to the survival of the species. Therefore, the mechanism of the effects of key environment factors on the fish reproduction is become an urgent scientific issue need to research. Taking the Grass carp as study object, this research will use field monitoring and laboratory experiment to analyze the relationships between Grass carp reproduction and water temperature and velocity. Finally, this research will provide the basic knowledge for the ecological regulation of large dams and river ecological restoration.