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      • 양양 남대천과 영덕 오십천의 어도 및 어류의 소상

        황종서 ( Hwang Chong Seo ),허협 ( Hur Hyub ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.5

        The fishways at Namdae-cheon and Osib-cheon were investigated from July 1998 through October 1999. There are three types of fishways on these rivers. Those are baffled fishway, fish ladder, and fish ladder with gabion. Namdae-cheon has 7 baffled fishways and 19 fish ladders, and Osib-cheon has 7 gabion fishways. On namdae-cheon, 1,775 fishes of 24 species were collected. Among these fishes, 452 fishes of 11 species were anadromous fishes occupying 46% in species and 25% in number. On Osib-cheon, 1,953 fishes of 24 species were collected. Among these fishes, 483 fishes of 5 species were anadromous fishes occupying 21% in species and 25% in number. On Namdae-cheon the species number and abundance decreased gradually upstream. The poor structure of fishways seems to have worked as an obstacle to the upstream migration of fishes in the Namdae-cheon. On Osib-cheon all the observed fish species except three-spined stickleback(Gasterosteus aculeatus aculeatus) which stay and spawn around downstream of fiver could migrate upstream. The good structure of fishways on this river is thought to have helped upstream fish migration.

      • 양양 남대천과 영덕 오십천의 어도현황과 어류의 이용

        황종서 ( Hwang Chong Seo ),허협 ( Hur Hyub ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-

        The fishways on Namdae-cheon and Osib-cheon and the use of migratory fishes were investigated from July 1998 through June 1999. There are three types of fishways on these rivers. Those are baffled fishways, fish ladder, and fish ladder with gabion. Namdae-chcon has 7 baffled fishways and 19 fish ladder, and Osib-cheon has only fish ladder with gabion. On Namdae-cheon 1,195 fishes of 24 species were collected. Among these fishes 241 fishes of 9 species were anadromous fishes occupying 38% in species and 19% in number. On Osib-cheon 1,015 fishes of 24 species were collected. Among these fishes 240 fishes of 5 species were anadromous fishes occupying 21% in species and 24% in number. On Namdae-cheon the species number and abundance decreased gradually upstream. The poor structure of fishways seems to have worked as an obstacle to the upstream migration of fishes on Namdae-cheon. On Osib-cheon all the observed fish species except three-spined stickleback (Gasterosteus aculeatus aculeatus) which stay and spawn around downstream of river could migrate upstream. The good structure of fishways on this river is thought to have helped upstream fish migration.

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