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http://dx.doi.org/10.11614/KSL.2020.53.4.445

The Distribution and Migration Boundary Lines of Oncorhynchus keta in the Milyang River  

Hong, Donghyun (Department of Integrated Biological Science, Pusan National University)
Seong, Ki Baik (Waterco)
Ko, Eui-Jeong (Department of Integrated Biological Science, Pusan National University)
Jung, Eunsong (Department of Integrated Biological Science, Pusan National University)
Jo, Hyunbin (Department of Integrated Biological Science, Pusan National University)
Joo, Gea-Jae (Department of Integrated Biological Science, Pusan National University)
Publication Information
Korean Journal of Ecology and Environment / v.53, no.4, 2020 , pp. 445-452 More about this Journal
Abstract
In this study, we carried out a distribution and migration boundary lines of chum salmon (Oncorhynchus keta) in the Milyang River. We measured the total length of dead chum salmons. As a results, 40 chum salmons were found during the study period, 25 dead salmons and 15 alive individuals. The ratio of female was 64%. We verified the migration boundary lines of chum salmons based on a sighting survey until detecting a structure that chum salmons are not able to migrate upstream. We discovered that chum salmons were not able to migrate up to 13 km in a mainstream of the Milyang River and up to 12 km in the Danjang stream (a tributary of the Milayang River) from upstream of the Yerim Bridge. Therefore, our results indicate that Milyang River should improve a river connectivity by demolishing weirs that disturb chum salmon's migration or installing appropriate fishways. Also, effective legislations are needed to retain naturality in spawning ground and micro-habitats to increase the survival rate of parrs and smolts.
Keywords
Oncorhynchus keta; sighting survey; migration boundary lines; weirs; river connectivity;
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