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

中谷, 敏邦

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

中谷, 敏邦

北海道大学水産科学研究彙報, 2008, 58(1-2), 1-6

Permalink : https://hdl.handle.net/2115/33079

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アクセス権	open access
URI	https://hdl.handle.net/2115/33079
タイトル	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
タイトル	Recent Year Class Strengths of Walleye Pollock (Theragra chalcogramma) Pacific Population and Oceanographic Conditions for First-feeding Pollock Larvae
著者	e-Rad_Researcher 80188979 著者名中谷, 敏邦 Nakatani, Toshikuni
言語	日本語
キーワード	walleye pollock
	year class strength
	Funka Bay
	hydrographic condition
	food condition for firstfeeding pollock larvae
発行日	2008-05-30
出版者	北海道大学大学院水産科学研究院
出版者	RESEARCH FACULTY OF FISHERIES SCIENCES, HOKKAIDO UNIVERSITY
収録物名	北海道大学水産科学研究彙報
収録物名	BULLETIN OF FISHERIES SCIENCES, HOKKAIDO UNIVERSITY
巻(号)	58(1-2)
ページ	1-6
抄録	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.
資源タイプ	紀要論文
出版タイプ	Version of Record
PISSN	1346-1842