Inducing Flow Velocities to Manage Fish Reproduction in Regulated Rivers  

作　　者：Qiuwen Chen Jianyun Zhang Yuchen Chen Kangle Mo Jun Wang Lei Tang Yuqing Lin Lei Chen Yong Gao Wei Jiang Yuxin Zhang 

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China [2]Center for Eco-Environmental Research,Nanjing Hydraulic Research Institute,Nanjing 210029,China [3]Yangtze Institute for Conservation and Green Development,Nanjing 210029,China [4]Chinese Sturgeon Research Institute,China Three Gorges Corporation,Yichang 443000,China [5]Chongqing Jiaotong University,Chongqing 400074,China

出　　处：《Engineering》2021年第2期178-186,共9页工程（英文）

基　　金：This work is supported by the National Key Research and Development Program of China(2016YFC0502205);the National Natural Science Foundation of China(51425902).

摘　　要：Conservation of endangered or economic fish and control of invasive fish is a great challenge of hydraulic engineering worldwide.Flow velocity has been recognized to affect the spawning of fishes delivering drifting eggs in rivers.However,solid scientific supports and associated mechanisms to establish quantitative relations between flow velocity and fish reproduction,taking into account spawning,fertilizing,hatching,as well as surviving,are lacking.In this paper,we quantified the relationship between flow velocity and reproduction of Chinese carps through both lab and field experiments.The results showed that a minimum velocity was required to trigger Hypophthalmichthys molitrix(H.molitrix)releasing eggs,and a velocity range was preferred to sustain spawning activity.However,the embryo incubation and larvae development of H.molitrix were found to be inhibited with the increase in flow velocity.Considering the requirements of spawning and hatching,as well as larvae surviving,an optimized flow velocity processes was identified for the reproduction of H.molitrix in rivers.These findings were of great significance to the adaptive operation of reservoirs to create reasonable and precise ecological flows for managing fish reproduction,as shown by the promising results in the engineering application to the Three Gorges Reservoir.

关 键 词：River damming Chinese carps Population management Ecological flow Yangtze River 

分 类 号：S931.1[农业科学—渔业资源]