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KMID : 1024520140230081513
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Journal of the Environmental Sciences
2014 Volume.23 No. 8 p.1513 ~ p.1522
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Fish Passage Assessments in the Fishway of Juksan Weir Constructed in the Downstream Area of Youngsan-River Watershed
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Park Chan-Seo
An Kwang-Guk
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Abstract
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Fish passage asssessments were conducted in the fishway at Juksan Weir, which was constructed as a four-major
rivers project in the downstream area of Youngsan-River Watershed. For the research, fish-movements/migrations
were analyzed for seven times from April ~ October, 2013 using an approach of fish trap-setting. Fish fauna and
compositions were analyzed in the fishway, and seasonal- and diel-movement patterns were analyzed in relation to
current velocity in the fishway. Also, abundances of exotic fishes such as bluegill sunfish (Lepomis macrochirus),
large-mouth bass (Micropterus salmoides), and white curcian carp (Carassius cuvieri) were monitored in the fishway.
Current velocity(n = 18) in the fishway showed large variations (0.82 ± 0.63 m/s) depending on the location of the fish
trap-setting and this physical factor influenced the fish movements. Fish movements, based on the CPUE of individuals,
in the fishway was greater in slower velocity (mean: 0.36 m/s, range: 0.10~1.54 m/s) than faster velocity (mean: 1.51
m/s, range: 0.90~1.90 m/s). Seasonal analysis of fish movements showed that most frequent uses (8 speices and 591
individuals, 66.2% of the total) of the fishway occurred in spring period(i.e., June). Diel movement analysis, in the mean
time, showed highest in the time period of 00:00 ~ 3:00 am (7 species and 281 individuals, 20.9% of the total). The
efficient managements in the fishway at Juksan Weir are required in relation to the hydrological regime.
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KEYWORD
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Distribution, Fish community, Juksan Weir, Weir construction
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