Impact of the Three Gorges Dam on reproduction of four major Chinese carps species in the middle reaches of the Changjiang River

作     者：黎明政 段中华 高欣 曹文宣 刘焕章 

作者机构：Institute of HydrobiologyChinese Academy of Sciences Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy Of SciencesChinese Academy of Sciences 

出 版 物：《Chinese Journal of Oceanology and Limnology》 (中国海洋湖沼学报（英文版）)

年 卷 期：2016年第34卷第5期

页      面：885-893页

核心收录：

学科分类：0710[理学-生物学] 0908[农学-水产] 0707[理学-海洋科学] 09[农学] 0815[工学-水利工程] 

基　　金：Supported by the Three Gorges Project Eco-Environmental Monitoring System(No.JJ-010) the China Three Gorges Corporation(No.0704097,0799533) 

主　　题：Changjiang(Yangtze) River Three Gorges Dam Chinese carp reproduction eggs and larvae 

摘      要：Silver carp(Hypophthalmichthys molitrix),bighead carp(Aristichthys nobilis),grass carp(Ctenopharyngodon idella),and black carp(Mylopharyngodon piceus) are the four major Chinese carps and are commercially important aquaculture species in *** of these carp has declined since the construction of the Three Gorges Dam(TGD) due to an altered water flow and thermal regime in the Changjiang(Yangtze) ***,details of the changes in reproduction of the four species are not well *** assess the impact of the TGD on reproduction of the four carp,we investigated their eggs and larvae at Yidu City,which is 80 km below the TGD,during *** examined differences in larval abundance of the four species in the Jianli section(350 km downstream of the TGD) before(1997-2002)and after(2003-2012) construction of the *** on these observations,the first spawning date of the four species was delayed a mean of about 25 days after the dam was *** egg abundance in the Yidu section of the river was 249 million and mean larval abundance was 464 million,which were significant decreases since the 1980 ***,larval abundance in the Jianli section after the dam was constructed was significantly lower than that before construction(ANCOVA,P0.05).The observed larval abundance accounted for only 24.66%of the predicted value in 2003 when the dam was first *** present spawning grounds between the TGD and Yidu section of the river are very similar to those described in the 1980 s,and some spawning grounds exist upstream of the *** free-flowing stretches upstream of the TGD and the creation of artificially flooded downstream reaches are needed to stimulate spawning and effectively conserve these four major Chinese carps species.