Fisheries Science

, Volume 85, Issue 1, pp 71–80 | Cite as

Factors controlling spatiotemporal variations in stable nitrogen isotopes of Trachurus japonicus larvae and juveniles in the East China Sea

  • Weiping Mei
  • Yu UmezawaEmail author
  • Xin Wan
  • Chiyuki Sassa
  • Motomitsu Takahashi
Original Article Biology


To clarify the factors that affect spatiotemporal isotopic variations in fishes, we examined stable carbon and nitrogen isotope ratios (δ13C and δ15N) of Japanese jack mackerel Trachurus japonicus larvae and juveniles sampled in the shelf break region of the East China Sea (ECS) in April during six consecutive surveys (2005–2010). The δ13C values in fish tissues were similar between northern and southern ECS, while δ15N values were higher in the southern ECS, probably because of lower nitrogen fixation and the presence of fish with larger body size occupying a higher trophic level. Interannual variations in δ15N of T. japonicus juveniles might be mainly contributed by the variation in the abundance of the main diet such as Oncaeidae copepodites and Corycaeus. The isotopic overlaps between epipelagic T. japonicus larvae and other dominant mesopelagic fish larvae were negligible, suggesting lesser competition for food resources. Knowledge regarding spatiotemporal variation in stable isotope ratios of T. japonicus can be applied to understand the feeding habits and migrations of fishes in the ECS.


Spatiotemporal variations Stable carbon and nitrogen isotopes Larvae and juveniles Trachurus japonicus 



We are grateful to the captains, officers and crews of RV Yoko-Maru for their assistances in the field sampling. We also thank the Fisheries Agency of Japan for sharing the fish samples for SI ratios analyses. This study was financially supported by the Study of Kuroshio Ecosystem Dynamics for Sustainable Fisheries (SKED), funded by the MEXT (Ministry of Education, Culture, Sports, Science and Technology), Japan.

Supplementary material

12562_2018_1267_MOESM1_ESM.docx (173 kb)
Supplementary material 1 (DOCX 174 kb)


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Copyright information

© Japanese Society of Fisheries Science 2018

Authors and Affiliations

  • Weiping Mei
    • 1
  • Yu Umezawa
    • 1
    • 2
  • Xin Wan
    • 1
  • Chiyuki Sassa
    • 3
  • Motomitsu Takahashi
    • 3
  1. 1.Graduate School of Fisheries and Environmental SciencesNagasaki UniversityNagasakiJapan
  2. 2.Department of Environmental Science on BiosphereTokyo University of Agriculture and TechnologyFuchuJapan
  3. 3.Seikai National Fisheries Research InstituteJapan Fisheries Research and Education AgencyNagasakiJapan

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