长江中游洪湖至宜昌江段鱼类空间分布特征的水声学研究

doi:10.11870/cjlyzyyhj201612007

Abstract

Abstract: In order to better understand the spatial-temporal distribution of fish in the middle reach of Yangtze River from Honghu to Yichang section in 2014 and 2015, we applied hydroacoustic analysis with Simrad EY60 split-beam echo sounder, in autumn (October to November,2014), spring (April to May,2015), and summer (July,2015). The results showed that the echo image detection of the fishes in the Yangtze River are relatively clear, and the background noise is small, the lake bottom reflected signals are strong, the fish populations of the Yangtze River is relatively small, mostly individual activities. Nonparametric test results suggested the target strength (TS) of the fish varied significantly among seasons (P<0.01), being highest in summer (-47.2±8.6) dB and lowest (-60.0±6.4) dB in spring. The horizontal distribution of fish density was not homogeneous, and varied significantly among seasons (F=151.08, P<0.01). The maximum density was 63.7 ind./1000 m3, 141.4 ind./1000 m³, and 266 ind./1000 m³ in autumn, spring, and summer, respectively. Vertically, the fish abundance followed the following order:the surface layer > the middle layer > the bottom layer, and the distribution was the same in the three seasons, and fish density varied significantly in the same water layer among 3 seasons (df=2,P<0.01). Under the homogeneity of variance, the LSD method was applied for multiple comparison of fish density between each water layer in 3 seasons. The results suggested that the fish density varied significantly between surface layer and bottom layer in autumn (P<0.05), the fish density was not significantly different between surface layer and bottom layer in spring (P>0.05), the fish density varied significantly among layers in summer (P<0.05). The distribution was possibly caused by the winter migration, feeding migratory, reproductive migration, and some other factors.

Key words: the middle reach of Yangtze River, fish resources, temporal and spatial distribution, hydroacoustics

CLC Number:

S932.4

DUAN Xin-bin, XIE Yi-jun, GUO Jie, WANG Ke, LIU Shao-ping, CHEN Da-qing. HYDROACOUSTIC SURVEYS ON TEMPORAL AND SPATIAL DISTRIBUTION OF FISHES IN THE SECTION FROM HONGHU TO YICHANG OF THE YANGTZE RIVER MIDDLE REACHES[J].RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2016, 25(12): 1842-1849.

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HYDROACOUSTIC SURVEYS ON TEMPORAL AND SPATIAL DISTRIBUTION OF FISHES IN THE SECTION FROM HONGHU TO YICHANG OF THE YANGTZE RIVER MIDDLE REACHES

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