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タイトル
  • en Food Availability for First-feeding Walleye Pollock (Theragr chalcogramma) Larvae during Winter in and Near Funka Bay, Hokkaido, Japan, as Inferred from Copepod Nauplii Abundance
作成者
    • en Ohshima, Masakane
    • en Yoshida, Kie
    • en Sasaki, Shiho
    • en Shirakawa, Norihiro
    • en Yamamoto, Naohiro
アクセス権 open access
主題
  • Other en Oithona similis
  • Other en Oithona nauplii
  • Other en Reproduction
  • Other en Food conditions
  • Other en First-feeding walleye pollock
  • Other en Theragra chalcogramma
  • Other en Larvae
  • Other en Funka Bay
  • Other en Hokkaido
  • Other en Japan
  • NDC 660
内容注記
  • Abstract en To clarify the relationship between the food availability for pollock larvae and the hydrographic conditions in Funka Bay, horizontal distributions of water temperature, salinity and Oithona nauplii (main food for larval pollock) were investigated in winter from 2001 to 2003 in and near the bay. In January 2001 and 2003, the Oyashio coastal cold-water mass and the Tsugaru warm-water mass were co-distributed in the bay and its mouth region, but in January 2002, the Oyashio coastal cold-water mass has already exchanged with the Tsugaru warm-water mass. The median abundances of Oithona nauplii in January of each year were not different significantly. In January 2003, the density of female O. similis (main producer of Oithona nauplii) was higher in the Oyashio coastal cold-water mass than in the Tsugaru warm-water mass, while the densities of Oithona N1 in the Oyashio coastal cold-water mass and the Tsugaru marm-water mass were almost identical. These data indicate that the high activity of the individual reproduction is occurred in the Tsugaru warm water. From the results, it is considered that the warm-water temperature and the reproduction of O. similis in the Tsugaru warm-water mass in winter in Funka Bay support the larval feeding success.
出版者 ja 北海道大学大学院水産科学研究院 en RESEARCH FACULTY OF FISHERIES SCIENCES, HOKKAIDO UNIVERSITY
日付
    Issued2007-12
言語
  • eng
資源タイプ departmental bulletin paper
出版タイプ VoR
資源識別子 HDL http://hdl.handle.net/2115/32484
収録誌情報
    • PISSN 1346-1842
      • ja 北海道大学水産科学研究彙報 en BULLETIN OF FISHERIES SCIENCES, HOKKAIDO UNIVERSITY
      • 巻57 号3 開始ページ25 終了ページ35
ファイル
    • fulltext P25-35.pdf
    • 289.83 KB (application/pdf)
      • Issued2007-12
コンテンツ更新日時 2023-07-26