广西西江来宾段鱼类早期资源及耳石日轮技术的运用

鱼类早期资源量反映了鱼类的繁殖规模及种群的变动趋势，以鱼类发育早期的鱼卵、鱼苗为对象，进行资源评价，产卵场及产卵规模的评估，是渔业资源研究的重要手段。广西西江中上游江段梯级水利工程运行后，鱼类资源的群落结构、多样性、产卵场等已发生重大变化。本研究通过前期的采样和科研探索，选取西江来宾三江口段（红水河、柳江、黔江）为研究区域，结合传统仔稚鱼鉴定方法与耳石日轮技术，明确该江段鱼类早期资源的种类组成及变动规律，明晰鱼类早期资源的时空分布格局及其与环境因子的关系，判定鱼类产卵场的规模及分布位置。该项目的研究成果对西江中上游鱼类资源多样性保护和恢复，水利工程的生态调度具有理论和实践意义。

Resources of fishes in the early life stages reflect the trends of fish reproductive scale and population change. It is an important means of fishery study to monitor the fish eggs and larvae and to evaluate the spawning scale. The community structure, diversity and spawning grounds of fish resources in the middle and upper reaches of Xijiang River have undergone significant changes after the formation of the cascade reservoirs. Through preliminary sampling and scientific research, this study selected Laibin Sanjiangkou (Hongshui River, Liujiang River and Qianjiang River) as the sampling sites, which was rich in fish resources in the early stages. Based on traditional method for larval fish identification and daily growth ring in otolithic, this study aims to reveal the current status of resources, species composition and its change rule; to clarify the temporal and spatial variation of larval fish communities and their relationship with the environmental factors; to determine the size and distribution of spawning ground. This project could provide theoretical and practical basis for the conservation and restoration of fish resources and the ecological dispatching of water conservancy projects in the middle and upper reaches of the Xijiang River.