Acoustic assessment of fish resources in subtropical run-off-river hydropower plant in the Pearl River

3rd International Conference on Water Resource and Environment

地球科学;生态环境科学

Wu, Z.^1 ; Zhu, S.L.^1 ; Li, J.^1 ; Yang, J.P.^1 ; Li, Y.F.^1 ; Li, X.H.^1

Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, No. 1 Xingyu Road, Liwan District, Guangdong Province, Guangzhou, China^1

关键词: Acoustic assessment;    Ecological environments;    Fish distributions;    Horizontal distribution;    Hydrological characteristics;    Hydropower plants;    Split-beam echo sounders;    Target strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/82/1/012082/pdf
DOI  :  10.1088/1755-1315/82/1/012082

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

As the utmost downstream dam in the main stream of Xijiang River, Changzhou Hydro-Junction has changed the original hydrological characteristics and ecological environment of Xijiang River. In order to grasp the fish distribution and standing crops after reservoir impoundment, a split beam echo-sounder EY60 (120 kHz) was used in the river channel from Guiping to Wuzhou in April 2014, 2015, and 2016. The average fish density in the survey area was 0.1215±0.4198 ind.m-3in 2014, 0.0190±0.1232 ind.m-3in 2015 and 0.0107±0.0186 ind.m-3in 2016. According to the horizontal distribution data, fish density showed significant difference in different area and the density in the upper area was significantly higher than that in other areas. Moreover, fish density was negatively correlation with water depth. As a whole, the Target Strength (TS) decreased in the past three year, TS was significantly different among the three areas and showed a decreasing tendency from the dam area to the upper area. Fish resources decreased gradually, as indicated by the decreased fish density and miniaturized fish sizes in the past three years.