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Article

Spatiotemporal Distribution and Species Composition of Fish Assemblages in the Transitional Zone of the Three Gorges Reservoir, China

1
Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
2
Hubei Key Laboratory of Three Gorges Project for Conservation of Fishes, Chinese Sturgeon Research Institute, China Three Gorges Corporation, Yichang 443000, China
3
Department of Maritime Police and Production System, Institute of Marine Industry, Gyeongsang National University, Tongyeong 650-912, Korea
*
Authors to whom correspondence should be addressed.
Water 2020, 12(12), 3514; https://doi.org/10.3390/w12123514
Received: 27 October 2020 / Revised: 27 November 2020 / Accepted: 10 December 2020 / Published: 14 December 2020
(This article belongs to the Special Issue Hydroacoustics in Marine, Transitional and Freshwaters)
The river–reservoir transitional zones play an important role in maintaining riverine fish biodiversity and abundance in highly regulated rivers. The Upper Yangtze River, which contains 286 fish species, is experiencing intense hydropower development. However, few studies have been conducted on the spatial distribution of fish in the river–reservoir transitional zones in the Upper Yangtze River, and it is therefore difficult to predict how this development will impact the region. In this study, a 200-kHz split-beam acoustic system in combination with biological samplings was used to investigate the composition and spatiotemporal distribution of the fish in the transition zone of the Three Gorges Reservoir (TGR) in 2017. The biological samplings comprised 7434 individuals from 61 species, 38 genera, 15 families, and 5 orders. The dominant fish species were Rhinogobio cylindricus, Coreius guichenoti, Hemiculter bleekeri, and Pelteobagrus vachelli. Acoustic detection identified the mean target strength (TS) to be −55.6 in May, −57.8 in August, and −55.8 dB in December. Accordingly, the average fish density was 4.96, 6.96, and 4.42 ind/1000 m3. Significant differences were found in the TS and fish density between flood season (August) and non-flood season (May and December). Spatially, fish preferred the meandering sections at 10–20 m deep. A size-dependent vertical distribution pattern was observed, with larger fish in the deeper layers and smaller fish in shallower waters. Lastly, our results suggest that meandering deep channels should be assigned high priority with respect to fish conservation in the Upper Yangtze River. View Full-Text
Keywords: fish distribution; hydroacoustic; environmental variables; Upper Yangtze River; Three Gorges Reservoir fish distribution; hydroacoustic; environmental variables; Upper Yangtze River; Three Gorges Reservoir
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MDPI and ACS Style

Lin, P.; Chen, L.; Gao, X.; Wang, C.; Gao, X.; Kang, M. Spatiotemporal Distribution and Species Composition of Fish Assemblages in the Transitional Zone of the Three Gorges Reservoir, China. Water 2020, 12, 3514. https://doi.org/10.3390/w12123514

AMA Style

Lin P, Chen L, Gao X, Wang C, Gao X, Kang M. Spatiotemporal Distribution and Species Composition of Fish Assemblages in the Transitional Zone of the Three Gorges Reservoir, China. Water. 2020; 12(12):3514. https://doi.org/10.3390/w12123514

Chicago/Turabian Style

Lin, Pengcheng, Lin Chen, Xingchen Gao, Chunling Wang, Xin Gao, and Myounghee Kang. 2020. "Spatiotemporal Distribution and Species Composition of Fish Assemblages in the Transitional Zone of the Three Gorges Reservoir, China" Water 12, no. 12: 3514. https://doi.org/10.3390/w12123514

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