Study on the Water Environment and Fish Distribution Charac-teristics of Fish Important Habitat in Chongqing Section of the Upper Reaches of Yangtze River Reserve
In order to explore the water environment and fish distribution characteristics of important habitats(spawning grounds,feeding grounds,and wintering grounds)in Chongqing Section of the Upper Reaches of the Yangtze River Reserve(hereinafter referred to as the"Reserve"),in winter 2021(Overwintering peri-od),summer 2022(Oviposition period)and autumn 2022(Baiting period),six survey river sections were set up in the Chongqing section of the reserve,including Yangshi(S1),Songgai(S2),Baisha(S3),Youxi-Long-hua(S4),Jiangjin urban area(S5),Luohuang(S6).Three hydroacoustic surveys were carried out and the wa-ter quality of each river section was analyzed.The results of hydroacoustic survey showed that the average densities of fish in the three times were 0.584,0.590 and 0.595 ind./m2,respectively.The important habitats detected were mainly distributed in spawning grounds such as Gujiatuo,Dingjiatuo,Jiangkou and Wangjiatuo.There were significant differences in fish density in different river sections(P＜0.05),and the overall per-formance was higher in the downstream than that in the upstream.The density of fish in important habitats was significantly different in different river sections(P＜0.05),but not significantly different in different pe-riods(P＞0.05),and the overall density was significantly higher than that in non-important habitats.The re-sults of water quality monitoring showed that there was no obvious difference in water quality between up-stream and downstream.In summary,the water quality of important habitats in the Chongqing section of the protected area is good,which can meet the needs of fish growth and reproduction.Except total nitrogen,the other seven water quality indexes all reached the class Ⅲ surface water standard,which met the requirements of fishery water quality.In summary,the water quality of the important habitats for fish in the Chongqing section of the reserve is good,which can meet the needs of fish growth and reproduction.
upper reaches of Yangtze Riverreservefish habitathydroacousticsaquatic environmentfish density
国家科技期刊平台
NSTL
万方数据
