汉江中下游梯级开发对产漂流性卵鱼类繁殖的影响

Impact of Cascaded Hydroelectric on Reproduction of Fish with Pelagic Eggs in Middle and Lower Reaches of Hanjiang River

目前汉江中下游已规划7个梯级枢纽实施开发。多年的观测记录表明,汉江中游已建梯级对产漂流性卵鱼类繁殖的影响主要包括产卵场数量减少、规模缩小、"四大家鱼"产卵比重下降等。在梯级开发完成后,这些影响将更加显著,"四大家鱼"产卵场有在汉江中游消失的风险,必须采取工程措施、流域综合管理和生态调度措施予以缓解和补偿。

The planning of cascaded hydroelectric in middle and lower reaches of Hanjiang River includes 7 hydraulic projects. Observational records of many years shows the completed hydraulic projects have brought obvious impacts on repro-duction of fish with palagic eggs, such as the decrease in the number and scale of spawning grounds, the decline in the pro-portion of 'Four Major Chinese Carps', etc. With the full accomplishment of cascaded hydroelectric project, the impact will be more serious, cause the risk of disappearing of the spawning grounds of'Four Major Chinese Carps'in Middle Reaches of Hanjiang River. To relieve and compensate such negative impacts, the necessary engineering measures,the integrated management and ecological operation of river basin should be deployed.