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タイトル
  • ja 1991年から2013年に至る冬季北海道噴火湾の海洋環境とスケトウダラ Walleye Pollock Gadus chalcogrammus 北海道太平洋個体群の年級群強度との関係
  • en Relationship between Hydrographic Conditions in Funka Bay, Hokkaido, during Winter and Year Class Strength of the Japanese Pacific Population of Walleye Pollock Gadus chalcogrammus from 1991 to 2013
作成者
アクセス権 open access
主題
  • Other en Decadal observation
  • Other en Walleye pollock
  • Other en Early life history
  • Other en Funka Bay
  • Other en Food availability
  • Other en Year class strength
  • NDC 660
内容注記
  • Abstract en Funka Bay is the main nursery ground of the Japanese Pacific population of walleye pollock Gadus chalcogrammus. To better understand how hydrographic and biological conditions are related to the survival of this population during the early life stages, hydrographic observations and field samplings have been conducted in Funka Bay since 1991 aboard the T/S Usio-Maru, Faculty of Fisheries, Hokkkaido University. Data have been collected on hydrographic conditions and the distributions of larval pollock and copepod nauplii(larval prey). The year class strength estimated by tuning VPA calculation has fluctuated annually and strong year classes occurred in 1991,1994,1995, 2005, and 2007. In these years, the Tsugaru Warm Water(TWW,>6℃, salinity>33.6) distributed in late January in Funka Bay and the Oyashio Cold Water(OCW,<3.0℃, salinity 33.0-33.3)entered the bay after mid February. In contrast, the recruitment failure was found in 2010,when cold water prevailed in early February in the bay due to early intrusion of OCW. From 1991 to 2013, walleye pollock larvae were mostly collected in late January. A positive relationship was found between the temperatures at 15 m depth in late January and the year class strength of the population(r=0.56, p=0.017). While no significant relationship was found between the density of copepod nauplii in late January and the year class strength(r=0.32, p=0.259). Previous studies have shown the feeding success of larval pollock is higher in TWW than in OCW. These results suggest that higher feeding success during the warmer years in late January in Funka Bay might have resulted in the strong year classes.
出版者 en Faculty of Fisheries Sciences, Hokkaido University
日付
    Issued2017-12
言語
  • jpn
資源タイプ departmental bulletin paper
出版タイプ VoR
資源識別子 DOI https://doi.org/10.14943/mem.fish.59.1-2.19 , HDL http://hdl.handle.net/2115/68164
ID
  • JaLC 10.14943/mem.fish.59.1-2.19
収録誌情報
    • PISSN 2186-1927
    • NCID AA12145888
      • en Memoirs of the Faculty of Fisheries Sciences, Hokkaido University
      • 巻59 号1-2 開始ページ19 終了ページ43
ファイル
コンテンツ更新日時 2023-07-26