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http://dx.doi.org/10.13000/JFMSE.2014.26.2.421

Marine Prey Selectivity of Released Juvenile Chum Salmon (Oncorhynchus keta) During arly Marine Migration in Korean Waters  

Kwon, O-Nam (Gangneung-Wonju National University)
Kim, Ju-Kyoung (Marine biology Center for Research and Education)
Yoon, Moon-Geun (Marine biology Center for Research and Education)
Kim, Doo-Ho (Marine biology Center for Research and Education)
Hong, Kwan-Eui (Marine biology Center for Research and Education)
Publication Information
Journal of Fisheries and Marine Sciences Education / v.26, no.2, 2014 , pp. 421-429 More about this Journal
Abstract
We investigated the feeding ecology of juvenile chum salmon (Oncorhynchus keta) during the critical early life stage prey selectivity of juvenile chum salmon during early marine migration in Korean waters at spring 2011. Salmon juveniles and zooplanktons were collected to draw with $20m{\times}5m$ gill net and $300{\mu}m$ mesh zooplankton net at each station on 11th-13th April n 2011. Collected zooplanktons were classified to 5 Phylum, 6 Class, 9 Order 17 Species in this study. Almost 76.4-100% species were classified to Phylum Arthropoda, dominant species was a species out of Hyperia galba of Order Amphipoda, Acartia spp and Paracalanus parvus of Order Calanoida. Collected salmon juveniles were grew up to average 4.7-5.4 cm fork length and average 1.0-1.5 g wet weight in whole station. Fish stomach content (mg/salmon) was heaver to 97.4, 82.4 and 63.2 mg wet weight/salmon in ST 2, 3, 4 than 20.4, 18.9 mg/salmon of ST 1, 5, because there are fish (sand eel, Hypoptychus dybowskii) and Krill (Euphausia) as prey in salmon stomach in ST 2, 3, 4. And ST 2, 3, 4 and 5 were dominated by Amphipoda as Hyperia galba, Themisto japonica and Gammarus sp., but ST 1 was dominated by copepod, because of absence of Amphipoda in the station. Therefore small Amphipoda as Hyperia galba was good prey for just released salmon juvenile in nature.
Keywords
Chum salmon; Released juvenile; Prey selection; Oncorhynchus keta;
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