Vertical distribution and diel migration of euphausiids from Oyashio Current to Kuroshio area off northeastern Japan

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The vertical distribution of dominant euphausiid species was investigated in the offshore waters of northeastern Japan in April and September 1998 and November 1999 using MOCNESS-I net samples. In total, 32 euphausiid species in eight genera were identified in the study area. Subarctic Euphausia pacifica and Thysanoessa inspinata occurred over a wide range, although mainly in the Oyashio and cooler transitional areas, and the former made a relative contribution of 78% to the total numerical abundance of euphausiids. At night, these species tended to stay near the surface in the Oyashio area and in deeper layers in warmer areas. During the daytime, they tended to stay in deeper layers in the warmer areas, although E. pacifica stayed in deeper layers even in the Oyashio area where the chlorophyll a concentration was low. T. inspinata did not perform clear diel vertical migration. Except for these subarctic species, five warm-water species of Euphausia were abundant among the epipelagic euphausiids. At night, these species tended to stay at a wide range of depths from the surface to subsurface layers in the warmer Kuroshio area, but were concentrated near the surface in the transitional area. During the daytime, they stayed in deeper layers in the Kuroshio area. Diel vertical migration of euphausiids seems to be strongly affected by water temperature, but other factors such as phytoplankton abundance may also be important. The possible effects of diel vertical migration of euphausiids on euphausiid fisheries are discussed.

収録刊行物

  • Plankton & benthos research  

    Plankton & benthos research 3(1), 27-35, 2008-02-01 

    日本プランクトン学会、日本ベントス学会

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各種コード

  • NII論文ID(NAID)
    10021072529
  • NII書誌ID(NCID)
    AA12130745
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    18808247
  • NDL 記事登録ID
    9404446
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z54-J424
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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