RESOURCES STATUS OF ICHTHYOPLANKTON IN THE UPPER YANGTZE RIVER BEFORE THE STORAGE OF JINSHA RIVER FIRST STAGE PROJECT
The surveys of Ichthyoplankton resources were carried out in Jiangjin section of the upper Yangtze River from May to July in 2010,2011 and 2012.The results showed that there were 21 species of fish with drifting eggs,some of which were endemic species in the upper Yangtze River,such as Leptobotia elongate,Leptobotia rubrilabris,Jinshaia sinensis,Rhinogobio ventralis,Rhinogobio cylindricus and Gobiobotia boulengeri.The total egg quantity in 2010,2011,and 2012 was 32.42 × 108 Ind.,46.72× 108 Ind.,and 39.71 × 108 Ind.respectively.Among them,the egg quantity of four major Chinese carps was 3.21 × 108 ind,4.52 × 108 ind,and 2.69 × 108 ind,respectively,the egg quantity of Coreius heterokon was 1.45 × 108 ind,3.33 × 108 ind and 3.87 × 108 ind,respectively,and the egg quantity of Leptobotia elongate was 0.29 × 108 ind,0.99 × 108 ind,and 0.58 × 108 ind,respectively.The main spawning season lasted from the end of May to the beginning of July.Significant correlations were found between the daily variation of eggs with runoff and water temperature.The spawning activities occurred intensively when daily variation of water level was higher than 0.24 m/d.The main spawning grounds were estimated at Rongshan,Hejiang and Mituo reaches of upper Yangtze River.The propagation of fish may be affected after the Storage of Jinsha River First Stage Project.
the Upper Yangtze Riverfish with drifting eggsspawning groundthe Storage of Jinsha River First Stage Project
NETL
NSTL
万方数据
维普
