| タイトル |
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ja
近年のスケトウダラ太平洋個体群年級群強度と摂餌開始期の海洋環境
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en
Recent Year Class Strengths of Walleye Pollock (Theragra chalcogramma) Pacific Population and Oceanographic Conditions for First-feeding Pollock Larvae
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| 作成者 |
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| アクセス権 |
open access |
| 主題 |
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Other
en
walleye pollock
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Other
en
year class strength
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Other
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Funka Bay
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Other
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hydrographic condition
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Other
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food condition for firstfeeding pollock larvae
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NDC
660
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| 内容注記 |
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Abstract
en
To understand the survival in the first-feeding stage of walleye pollock, Theragra chalcogramma, of the Pacific population in strong year classes(1991, 1994, 1995 and 2000), hydrographic and food conditions in winter in Funka Bay (nursery ground for pollock larvae) were investigated from 1991 to 2003. A delete intrusion of the Oyashio coastal cold water were observed and relatively warm temperature conditions were measured in the inner area of Funka Bay in 1991, 1994, 1995 and 2000. Relatively high densities of copepod nauplii, which were main food for first-feeding larvae, were also observed. These results indicate that warm water temperature sustains high reproduction of Oithona similis that are main producer of copepod nauplii in winter in Funka Bay, and a high feeding activity of first-feeding pollock larvae. Therefore, it can be concluded that suitable oceanographic conditions for survival of first-feeding pollock larvae of the Pacific population were occurred in Funka Bay in 1991, 1994, 1995 and 2000.
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| 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
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| 日付 |
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| 言語 |
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| 資源タイプ |
departmental bulletin paper |
| 出版タイプ |
VoR |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/33079
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| 収録誌情報 |
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ja
北海道大学水産科学研究彙報
en
BULLETIN OF FISHERIES SCIENCES, HOKKAIDO UNIVERSITY
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巻58
号1-2
開始ページ1
終了ページ6
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
