Study on Eeologieal Requirements and Operation for Flood at Natural Reproduction of the Four Major Chinese Carps in the Middle Reach of the Yangtze River, China
Flood has very important significance to ecological processes of fish. The relationships between Ecological functions of flood and the key stages of fishs growth are described as this paper. The impacts of flood discharge, occurrence time of flood on the different fish stages of life were also analyzed. Four important economic fishes involved the black carp, grass carp, silver carp and bighead carp that live in the middle and lower reaches of Yangtze River utilized for this study. Ecological requirements for flood in their natural breeding season were analyzed. The result showed that water rising rate in a day and rising duration were important to four major Chinese carps nature spawning requirements. Flood characteristics differences before and after Three Gorges Reservoir impoundment were also studied. Contrast to that before Three Gorges Reservoir impoundment, first flood occurrence time was delayed 5 days, rising duration was reduced 0. 43 days and rising range was decreased 0. lm. Due to Changes of some flood characteristics, it is obviously existed about badly impacts on four major Chinese carps nature spawning. Based on analysis between hydrological characters and the key stages of fish s growth , feasible ecological operation of Three Gorges Reservoir attained aim to provide a reference for protecting the fishes in the middle and lower reaches of Yangtze River.
Ecological effects of flooding The middle and lower reaches of Yangtze River four major Chinese carps Flood characteristics Ecological operation
Cai Yupeng Zou Tao Xu Wei Yang Zhi Wan Li
Institute of Hydroecology,Ministry Water Resources and Chinese Academy of Science,Wuhan 430079,China Electrical Engineering & Renewable Energy School,China Three Gorges University,Yichang 443000,China
国际会议
The Fourth Yangtze Forum(第四届长江论坛)
南京
英文
174-180
2011-04-18（万方平台首次上网日期，不代表论文的发表时间）