The Hydrological Impacts on the Spawning of Four Major Chinese Carps in the Hanjiang River, China
The black carp, grass carp, sliver carp and bighead carp are known together as four major Chinese carps for their important commercial values. To monitor the hydrological impacts on the spawning of the four major Chinese carps in the Hanjiang River (the longest tributary of the Yangtze River), the runoff of all drifting eggs and larvae in two sections, Shayang town and Zekou town that are located downstream the cascade dams in the middle reach, was investigated during the carp spawning season (from May to August) in 2006 and 2007. The results showed a total runoff of 1.983×1010 individuals (ind.) in 2006 and 7.856×109 ind. in 2007, which contained 2.768×107 and 3.245×107 ind. four major Chinese carps, respectively. In comparison to historical records, the total runoff of the drifting eggs and larvae showed a remarkable increase before 2006 and a rapid decrease after 2006, while that of the four major Chinese carps kept continuously declining. Correlation analysis between the spawning scales and hydrological conditions revealed that flood pulse with certain duration, fluctuating range and transparency plays a key role in the spawning of the four major Chinese carps. The results could shed new light on the joint ecological re-operation of the cascade reservoir groups to meet the requirement for the spawning of the four major Chinese carps.
Hanjiang River four major Chinese carps spawning flood
Z.Yang D.Zhu Y.C.Zhang W.X.Xie H.Y.Tang H.G.Liu X.J.Chen Y.Qiao J.B.Chang
Key Laboratory of Ecological Impacts of Hydraulic-projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan, Hubei 430079, China
国际会议
The 3rd Biennial ISRS Symposium Achieving Healthy and Viable Rivers (ISRS)第3届国际河流大会
北京
英文
69-76
2013-08-05（万方平台首次上网日期，不代表论文的发表时间）