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http://dx.doi.org/10.35399/ISK.34.3.4

Feeding Habits of the Largehead Hairtail, Trichiurus japonicus in the Yellow Sea of Korea  

Seong, Gi Chang (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Kim, Do-Gyun (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Kang, Da Yeon (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Jin, Suyeon (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Kim, Hoseung (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Soh, Ho Young (Department of Ocean Intergrated Science, Chonnam National University)
Baeck, Gun Wook (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
Publication Information
Korean Journal of Ichthyology / v.34, no.3, 2022 , pp. 179-185 More about this Journal
Abstract
The feeding habits of Largehead hairtail Trichiurus japonicus was studied using 377 specimens collected in the Yellow Sea of Korea. The specimens ranged from 4.5 to 33.7 cm in Anal length (AL). T. japonicus consumed mainly a piscivore, such as Engraulis japonicus [percent index of relative importance (%IRI) =74.1%]. We calculated the trophic level as 3.84 for T. japonicus. Fishes were the main prey items for all seasons. The main fish prey during autumn and winter was E. japonicus, whereas those during spring and summer was Larimichthys polyactis. Fishes were the main prey items for all size groups (<15 cm, 15~20 cm, 20~25 cm, ≥25 cm). T. japonicus also showed size-related dietary shift from Spratelloides gracilis and E. japonicus to L. polyactis and T. japonicus. As the anal length of T. japonicus increased, the mean number of preys per stomach (mN/ST) and the mean weight of preys per stomach (mW/ST) tended to increased (One-way ANOVA, P<0.05). Seasonal and size-related shifts in dietary composition were investigated by PERMANOVA analysis, which showed significant variations among size classes and seasons.
Keywords
Feeding habits; largehead hairtail; Trichiurus japonicus; Yellow Sea; dietary shift;
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