一覧に戻る

タイトル
  • en Vertical distribution and prey of walleye pollock in the northern Japan Sea
作成者
    • en Kooka, Kouji
    • en Kamei, Yoshihiko
    • en Takahashi, Toyomi
アクセス権 open access
権利情報
  • ja © 1998 公益社団法人日本水産学会
  • en © 1998 The Japanese Society of Fisheries Science
主題
  • Other en walleye pollock
  • Other en vertical distribution
  • Other en Themisto japonica
  • Other en Thysanoessa longipes
  • Other en Sagitta elegans
  • Other en Japan Sea
  • NDC 663
内容注記
  • Abstract en Vertical distributions of adult walleye pollock Theragra chalcogramma and oceanographic conditions were examined in the northern Japan Sea. In the daytime, most walleye pollock were distributed from 150 to 250m depth in April and from 400 to 500m depth in October. Between 150 and 500m depth, temperatures in October (0.4-8.8℃) were similar to those in April (0.5-5.4℃), salinity levels were fairly uniform in both months (34.0-34.2 PSU), and dissolved oxygen concentrations were 4.6-6.1ml/l in April and 4.7-6.4ml/l in October. The main foods of walleye pollock in April were the amphipod Themisto japonica, the euphausiid Thysanoessa longipes, and the chaetognath Sagitta elegans. Daytime weighted mean depths of T. longipes were significantly greater in October than in April. Biomass of T. longipes in the habitat of walleye pollock was significantly greater than other layers in both months. The seasonal change in vertical distribution of walleye pollock is presumably related to food availability of T. longipes.
出版者 en Japanese Society of Scientific Fisheries
日付
    Issued1998
言語
  • eng
資源タイプ journal article
出版タイプ VoR
資源識別子 HDL http://hdl.handle.net/2115/38560
関連
  • isIdenticalTo DOI https://doi.org/10.2331/fishsci.64.686
収録誌情報
    • PISSN 0919-9268
    • NCID AA10993718
      • en Fisheries Science
      • 64 5 開始ページ686 終了ページ693
ファイル
コンテンツ更新日時 2023-07-26