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http://dx.doi.org/10.3796/KSFOT.2021.57.2.117

Diet composition and trophic level of jack mackerel, Trachurus japonicus in the South Sea of Korea  

KIM, Do-Gyun (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
SEONG, Gi Chang (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
JIN, Suyeon (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
SOH, Ho Young (Department of Ocean Integrated Science, Chonnam National University)
BAECK, Gun Wook (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.57, no.2, 2021 , pp. 117-126 More about this Journal
Abstract
Diet composition and trophic level of Trachurus japonicus were studied using 417 specimens collected by trawls, set nets and purse seine fisheries from March 2019 to February 2020 in the South Sea of Korea. The size of T. Japonicus ranged from 7.0 to 49.8 cm in total length. T. japonicus were a carnivore that fed mainly on euphausiids and pisces. In eddition, T. japonicus fed on small quantities of cephalopods, crabs etc. T. japonicus showed ontogenetic changes in feeding habits. The proportion of euphausiids decreased inversely proportional to body size whereas the consumption of pisces gradually increased. As body size of T. japonicus increased the mean number of prey per stomach and the mean weight of prey per stomach tended to increase, but the mean number of prey per stomach was not significantly different. As a result of the feeding strategy analysis, T. japonicus were specialized feeders with pisces and euphausiids as their dominant prey. The trophic level ranged between 3.57 ± 0.54 and 3.91 ± 0.65, and increased asymptotically with size of specimens. The average trophic level of the T. japonicus was 3.79 ± 0.61.
Keywords
Trachurus japonicus; Diet composition; Trophic level;
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