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Marine Biology

, 165:100 | Cite as

Transported zooplankton from the Okhotsk Sea facilitate feeding and growth of juvenile walleye pollock on a continental shelf along the Oyashio Current, western subarctic Pacific

  • Kouji Kooka
  • Tomonori Hamatsu
  • Orio Yamamura
Original paper

Abstract

The advective transport of zooplankton provides an important source of energy on continental shelves. On a continental shelf along the Oyashio Current, western subarctic Pacific (42°30′N, 144°00′E), the extant water mass is replaced biannually by inflows of water masses from the highly productive Okhotsk Sea. These inflows and accompanying zooplankton are hypothesized to enhance biological production on the shelf. In this study, seasonal feeding and growth of a juvenile planktivorous fish, walleye pollock (Gadus chalcogrammus), on the shelf were examined in relation to water mass exchanges from September 2003 to June 2005. Zooplankton were sampled from February to April in 2004 and 2005, and in April 2014 and 2015. Juvenile pollock frequently consumed an Arctic copepod, Calanus glacialis, and a boreal euphausiid, Thysanoessa inermis, after January when the shelf was occupied by cold water masses that originated from the southwestern Okhotsk Sea. Juvenile pollock whose diet contained higher contributions of these energy-rich prey items exhibited positive growth in February–March 2005, whereas fish with lower proportions of these prey exhibited little growth during this period in 2004. The winter distributions of the copepod and euphausiid extended from a continental slope area in the southwestern rim of the Okhotsk Sea to the shelf along the Oyashio Current. Together, these results suggest the transport of zooplankton from the Okhotsk Sea likely influences the biological production of the coastal Oyashio ecosystem by enhancing the availability of energy-rich prey for juvenile pollock.

Notes

Acknowledgements

We thank the captains and crew members of the FV Yutaka, RV Tankai-Maru, RV Hokko-Maru, TV Oshoro-Maru, TV Hokusei-Maru, and RV Hokuyo-Maru for their assistance at sea; S. Honda, R. Ishida, and A. Nishimura for providing fish samples collected in their echo-integration trawl surveys; T. Azumaya, H. Kasai, H. Kuroda, K. Hirakawa, and K. Tadokoro for helpful discussion about physical and biological oceanography; and M. Ishiguro, Y. Kawaharada, K. Tohyama, and R. Yonekura for their laboratory assistance. We also thank E. Siddon and an anonymous reviewer for many constructive comments that greatly improved the manuscript.

Funding

This study was funded by research fellowships from the Japan Society for the Promotion of Science for Young Scientists (to KK), the projects of Assessment of Fisheries Stocks in the Waters around Japan from the Fisheries Agency of Japan (to TH), and the Dynamics of Commercial Fish Stocks (DoCoFis) program from the Fisheries Agency of Japan (to OY).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable international, national and/or institutional guidelines for the care and use of animals were followed.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Hokkaido National Fisheries Research InstituteJapan Fisheries Research and Education AgencyKushiroJapan
  2. 2.Graduate School of Fisheries ScienceHokkaido UniversityHakodateJapan

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