赣江作为鄱阳湖水系最大河流及长江重要支流之一，对鄱阳湖水系乃至长江水系的鱼类多样性、生物完整性保护与修复有不可替换的作用。随着赣江上水利枢纽的逐渐增多及水环境污染、采砂淘金、过度捕捞等其它因素胁迫的日益加剧，使得赣江流域的水生态系统岌岌可危，赣江流域的鱼类资源面临着严峻的考验。 目前，关于赣江流域的鱼类研究大多是20世纪90年代以前（万安枢纽截流前）所做的工作，时间久远且资料不全。本项目将系统分析赣江流域的鱼类多样性及其与环境参数的关系，阐述赣江流域鱼类多样性的变化趋势以及影响鱼类多样性分布的环境因子，同时了解赣江流域产漂流性卵鱼类产卵场现状及存在的问题。旨在为赣江流域的渔业资源管理及保护提供技术支持，并为研究赣江梯级枢纽运行的生态调度提供基础资料。

Ganjiang River, the largest river of the Poyang Lake Basin, is one of the main tributaries of the Yangtze River Basin. It is very important for protecting and restoring fish diversity and biological integrity in the Poyang Lake Basin and Yangtze River Basin. Besides the Wan'an hydro-project, three hydro-junctions (such as Shihutang, Xiajiang and Xingan) are still under construction on the Ganjiang River. And therefore, the habitat fragmentation in the Ganjiang River Basin is worsening because of the cascade development. Moreover, affected by the overfishing, sand excavating, gold washing and water environment pollution, the fish resources and water ecosystem in this area have been damaged. So far, many researchers have investigated the fish fauna in the Ganjiang River Basin, but most of the surveys had been made before 1990s. And what changes took place in the fish species composition and community in this area during the period of the operation of the Wan'an hydro-project. The purposes of this study are to: (1) comprehensively characterize the fish diversity and the relationship between their distribution and environmental factors in the Ganjiang River Basin; (2) analyse the status and questions of sqawning grounds of fish with drifting egg in this area; (3) review the main threats to fish biodiversity and present some recommendations for conservation.