Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Summer Patterns and Diel Variations of Fish Movements Using Fish Trap Sampling Technique in the Juksan Weir

죽산보의 어도에서 트랩 샘플링 기법을 이용한 하절기, 일주기별 어류 이동성 평가

  • Han, Jeong-Ho (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University) ;
  • Ko, Dae-Geun (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University) ;
  • Lim, Byung Jin (Yeongsan River Environmental Research Center) ;
  • Park, Jong-Hwan (Yeongsan River Environmental Research Center) ;
  • An, Kwang-Guk (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University)
  • 한정호 (충남대학교 생명시스템과학대학 생물과학과) ;
  • 고대근 (충남대학교 생명시스템과학대학 생물과학과) ;
  • 임병진 (국립환경과학원 영산강물환경연구소) ;
  • 박종환 (국립환경과학원 영산강물환경연구소) ;
  • 안광국 (충남대학교 생명시스템과학대학 생물과학과)
  • Received : 2012.10.15
  • Accepted : 2012.11.06
  • Published : 2012.12.31
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Abstract

The objective of this study was to evaluate seasonal patterns and diel variations of fish movements in the Juksan Weir which was constructed in 2010 at the down-stream of Yeongsan-River watershed. For this study, we monitored day-and-night movement(24 Hr cycle) and seasonal fish migration(June ~ August) patterns in 2011 along with species compositions and abundances depending on the locations of the traps within the fishway. Total number of species sampled was 14 and the total number of individuals was 1,263 with only the size-fractions(as total length) of the fish < 20 cm during the study. Seasonal analysis of fish movement in the fish way showed that highest frequency in the movement occurred in June - July, which is closely associated with a spawning peak season. The most dominant species using the fishway was Squalidus chankaensis tsuchigae, and this species turned out to be 26.9% of the total in the use rate of fishway. Daily monitoring of fish movements showed that most frequent movements occurred between 18:00 PM and 21:00 PM when the fish have a feeding time generally. The migratory fish were not found in the fishway during the study. Mean current velocity during the study $0.42{\pm}0.02ms^{-1}$(n = 42), and there were no significant statistical differences(p > 0.05) among the daily and monthly velocities in the fishway. The use rate of fish passage, in terms of fish species, was 48%, compared with total sampling of fish species(29 species) at the down-river regions during the same period, indicating a low use rate. Further continuous long-term monitoring should be conducted to evaluate the impacts of the weir construction in the river.

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