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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第58号 第1/2号 >


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Title: 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
Other Titles: Recent Year Class Strengths of Walleye Pollock (Theragra chalcogramma) Pacific Population and Oceanographic Conditions for First-feeding Pollock Larvae
Authors: 中谷, 敏邦1 Browse this author →KAKEN DB
Authors(alt): Nakatani, Toshikuni1
Keywords: walleye pollock
year class strength
Funka Bay
hydrographic condition
food condition for firstfeeding pollock larvae
Issue Date: 30-May-2008
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 58
Issue: 1-2
Start Page: 1
End Page: 6
Abstract: 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.
Type: bulletin (article)
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第58号 第1/2号

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