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http://dx.doi.org/10.23005/ksmls.2021.6.2.106

Monitoring the Growth of Juvenile Chum Salmon (Oncorhynchus keta) Released to Taehwa River of Korea  

Hur, Jun Wook (Department of Aquaculture and Aquatic Sciences, Kunsan National University)
Yoon, Ji Woo (Department of Marine and Fisheries Resources, Mokpo National University)
Lim, Han Kyu (Department of Marine and Fisheries Resources, Mokpo National University)
Publication Information
Journal of Marine Life Science / v.6, no.2, 2021 , pp. 106-116 More about this Journal
Abstract
To secure basic data by monitoring the growth of salmon (Oncorhynchus keta) released to the Taehwa River. After discharge, the characteristics of the young salmon distribution and migration rate habitat were investigated for two years. A total of 4 points [Sunbawi bridge (St.1), Guyeong bridge (St.2), Samho bridge (St.3), and Myeongchon bridge (St.4)] were investigated. The survey of 2017 indicating an increase of 10 mm in average length and 0.8 g in average weight, and the survey of 2018 indicating an increase of 10 mm in average length and 0.5 g in average weight. Among 39 species, 10 insectivorous and 12 omnivorous, are believed to compete with young salmon for food. 6, 5, 6 and 8 predatory fish species has emerged at each site, respectively. According to this study, it is believed that St.1 and St.2 points are more proper as discharge location of young salmon because these two points have less varied in depth, flow rate, salt concentration etc. In addition, it is thought that the night or dawn time in early January is the best discharge time of young salmon fish because predatory fish such as Korean piscivorous chub and bass etc. does not eat food actively at that time.
Keywords
Fish released; Growth; Optimal release zone; Salmon; Oncorhynchus keta;
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