Results
Title

Feeding Habits of Jack Mackerel, Trachurus japonicus, in the Coastal Waters of South Sea, Korea.

Authors

Baeck, Gun Wook; Seong, Gi Chang; Kang, Da Yeon; Jin, Suyeon; Soh, Ho Young; Kim, Do-Gyun

Abstract

Baeck, G.W.; Seong, G.C.; Kang, D.Y.; Jin, S.; Soh, H.Y., and Kim, D.-G., 2023. Feeding habits of jack mackerel, Trachurus japonicus, in the coastal waters of South Sea, Korea. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and Marine Management. Journal of Coastal Research, Special Issue No. 116, pp. 573-577. Charlotte (North Carolina), ISSN 0749-0208. To investigate the feeding habits of the jack mackerel, Trachurus japonicus, in the coastal waters of South Sea, Korea, fish samples were collected by a set net and purse seine fishery in March 2020 to February 2022. The Fork Length (FL) of these specimens was from 5.1 to 50.7 cm. T. japonicus were a carnivore that fed mainly on euphausiids and fishes. In addition, T. japonicus fed on small quantities of copepods, shrimps, cephalopods etc. T. japonicus underwent an ontogenetic dietary shift. The proportion of fishes and copepods decreased as body size increased, whereas the consumption of euphausiids increased gradually. Examination of the feeding habits according to ontogenetic feeding patterns in the diets of T. japonicus revealed that the mean number of prey (mN/ST) and mean weight of prey (mW/ST) continuously increased. Euphausiids most common prey during spring, autumn and winter, whereas fishes were mainly consumed during summer. Permutational Multivariate Analysis of Variance (PERMANOVA) revealed significant dietary differences by size class, and the interaction between the season and size class. T. japonicus were specialized feeders with euphausiids and fishes as their dominant prey.

Subjects

SOUTH Korea; CHARLOTTE (N.C.); TERRITORIAL waters; SEAWATER; MACKERELS; MULTIVARIATE analysis; ANIMAL feeds; HABIT

Publication

Journal of Coastal Research, 2023, Vol 116, p573

ISSN

0749-0208

Publication type

Academic Journal

DOI

10.2112/JCR-SI116-116.1