Trap을 이용한 공주보 아이스하버식 어도의 효과분석
Efficiency Analysis of the Ice Harbor Type Fishway Installed at the Gongju Weir on the Geum River using Traps
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참고문헌
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초록
To overcome the stream fragmentation and blockage of migration of fishes by damsand weirs, fishways are commonly installed. However, limited studies were conducted for effectivenessand suitability of fishways installed in Korean streams. In this study, we investigated fishusages (by time periods, locations and months) of the Ice Harbor type fishway installed in theGongju weir using traps. The monitoring were monthly conducted from June to October, 2012. The number of individuals which used fishway in September and October decreased than in Juneto August. Although no statistical significance was identified, many numbers of species and individualswere occurred at the trap installed at the left end of fishway than others. Fishes of morediverse size classes occurred at this trap as well. The number of collected individuals and waterlevel of weir were positively correlated though they showed low correlation coefficient. Conversely,occurrence rate of fishes smaller than 70 mm of total length decreased with increasing waterlevel of weir. fishway usage time of fish were different depends on ecological characteristics ofeach species. Various sizes of fishes can use fishway for their upstream migration. These resultsare useful for establishing management and evaluation plans of Ice Harbor type fishway in S. Korea.
Abstract
To overcome the stream fragmentation and blockage of migration of fishes by damsand weirs, fishways are commonly installed. However, limited studies were conducted for effectivenessand suitability of fishways installed in Korean streams. In this study, we investigated fishusages (by time periods, locations and months) of the Ice Harbor type fishway installed in theGongju weir using traps. The monitoring were monthly conducted from June to October, 2012. The number of individuals which used fishway in September and October decreased than in Juneto August. Although no statistical significance was identified, many numbers of species and individualswere occurred at the trap installed at the left end of fishway than others. Fishes of morediverse size classes occurred at this trap as well. The number of collected individuals and waterlevel of weir were positively correlated though they showed low correlation coefficient. Conversely,occurrence rate of fishes smaller than 70 mm of total length decreased with increasing waterlevel of weir. fishway usage time of fish were different depends on ecological characteristics ofeach species. Various sizes of fishes can use fishway for their upstream migration. These resultsare useful for establishing management and evaluation plans of Ice Harbor type fishway in S. Korea.
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