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pp.1513-1522
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.
1. 서 론
2. 재료 및 방법
2.1. 조사 대상지 현황
2.2. 죽산보 어도에서의 어류 트랩(Trap) 모니터링
2.3. 통계분석
3. 결과 및 고찰
3.1. 죽산보 어도의 유속 분포특성
3.2. 죽산보 어도의 어종 구성비 및 분포특성
3.3. 어도에서 어류이동에 대한 계절 변이 (Seasonal Variation)
3.3. 트랩(Trap) 위치의 구조적 특성에 따른 어류이동 특성
4. 결 론
감사의 글
참고문헌
