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Journal of Oceanography

, Volume 64, Issue 2, pp 185–194 | Cite as

Dietary shift and feeding intensity of Stenobrachius leucopsarus in the Bering Sea

  • Naoki Tanimata
  • Orio Yamamura
  • Yasunori Sakurai
  • Tomonori Azumaya
Original Articles

Abstract

The food habits of the dominant myctophid Stenobrachius leucopsarus were examined in the central basin of the Bering Sea in relation to oceanographic conditions, in summer 2002 and 2003 and spring 2006. S. leucopsarus exhibited an ontogenetic and seasonal dietary shift. In spring, small fish (≤40 mm) preyed mainly on Neocalanus flemingeri/plumchrus whereas large fish fed mainly on Neocalanus cristatus. In summer, small fish preyed mainly on Metridia pacifica whereas large fish fed mainly on euphausiids (Thysanoessa spp.). In the summer of 2003, when water temperature in the epipelagic layer (≤100 m) was warmer, reflecting the prevalence of the Alaskan Stream, small-sized S. leucopsarus showed a higher stomach content index, perhaps reflecting the greater abundance of M. pacifica. Thus, the present study shows that the physical variability in the epipelagic layer affects not only diets but also feeding performance of micronekton.

Keywords

Ontogenetic dietary shift Stenobrachius leucopsarus feeding intensity Bering Sea Alaskan stream 

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Copyright information

© The Oceanographic Society of Japan/TERRAPUB/Springer 2008

Authors and Affiliations

  • Naoki Tanimata
    • 1
  • Orio Yamamura
    • 2
  • Yasunori Sakurai
    • 1
  • Tomonori Azumaya
    • 2
  1. 1.Graduate School of Fisheries SciencesHokkaido UniversityHakodateJapan
  2. 2.Hokkaido National Fisheries Research InstituteKushiroJapan

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