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http://dx.doi.org/10.11614/KSL.2015.48.4.212

Characteristics of Fish Utilization of the Nature-like Fishway Installed at the Beakjae Weir  

Kim, Jeong-Hui (Department of Biology Education, Kongju National University)
Yoon, Ju-Duk (Biological Resource Research Center, Kongju National University)
Park, Sang-Hyeon (Department of Biology Education, Kongju National University)
Lee, Jin-Woong (Department of Biology Education, Kongju National University)
Baek, Seung-Ho (Department of Biology Education, Kongju National University)
Jang, Min-Ho (Department of Biology Education, Kongju National University)
Publication Information
Korean Journal of Ecology and Environment / v.48, no.4, 2015 , pp. 212-218 More about this Journal
Abstract
In South Korea, various nature-like fishways recently been installed for use by a wide variety of fish species. However, limited attempts have been made to monitor the fish utilization. The present study was conducted to ascertain the frequencies and patterns of utilization of the fishway installed at Beakjae Weir. We collected fish species that use the fishway by installing a fyke net at the exit of the fishway at least once a month from April 2013 to October 2013. Additionally, in order to identify all fish species that can potentially use the fishway, we investigated the fish fauna downstream to Beakjae Weir (mainstream of the Geum River). We found that 10 species belonging to 2 families used the fishway; this accounted for 64% of the total species inhabiting the mainstream. The species that used the fishway most frequently were Microphysogobio jeoni, followed by Squaliobarbus curriculus and Opsariichthys uncirostris amurensis. The highest number of fish using the fishway was observed in August, which was positively correlated with the water temperature (Spearman rank correlation, $r_s$=0.743, P=0.035). The sizes of the fish using the fishway varied widely, with the total body length ranging from 39 mm to 550 mm. Analysis of the time-dependent utilization frequency revealed that most fish used the fishway during the night (20:00~08:00). Compared to other fishways installed along the Geum River, the fishway installed at Beakjae Weir was used by fewer species and fish. This may be attributed to the structural inadequacy of the fishway, thereby resulting in a low attraction efficiency. Therefore, measures should be adopted to enhance the fishway attraction and passage efficiency. The results of this study can be used to ensure efficient operation and management of the Beakjae Weir fishway as well as serve as basic data for developing and building nature-like fishways tailored to Korean situations.
Keywords
Beakjae Weir; fishway; freshwater fish; Geum River;
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