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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: 北海道東部沖太平洋大陸斜面における底魚類の分布パターンと優占種の食性
Other Titles: Distribution Pattern of Demersal Fish and Food Habits of Dominant Fish Species on the Continental Slope off the Pacific Coast of Eastern Hokkaido, Japan
Authors: 山内, 務巨1 Browse this author
濱津, 友紀2 Browse this author
大村, 敏昭3 Browse this author
髙津, 哲也4 Browse this author →KAKEN DB
高橋, 豊美5 Browse this author
Authors(alt): Yamauchi, Michio1
Hamatsu, Tomonori2
Ohmura, Toshiaki3
Takatsu, Tetsuya4
Takahashi, Toyomi5
Keywords: Demersal fish
Eastern Hokkaido
Continental slope
Distribution pattern
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: 11
End Page: 19
Abstract: The distribution pattern of demersal fish and food habits of the dominant fish species were studied off the Pacific coast of eastern Hokkaido during the summer of 2003-2004 and the winter of 2005. In summer, the assemblages on the upper continental slope (<400m) were primarily dominated by single species such as walleye pollock Theragra chalcogramma. The assemblages on the upper-middle slope (400-700m) were dominated by threadfin hakeling Laemonema longipes, longnose eel Synaphobranchus kaupii, and soft eelpout Bothrocara molle. The assemblage on the lower-middle slope (>700m) was dominated by macrourids(chiefly, Coryphaenoides cinereus and C.pectoralis). However, in winter, the boundary between assemblages on the middle slope was obscured slightly by the bathymetric descent of threadfin hakeling from the upper-middle slopes to the lower-middle slopes. Most dominant fish species preyed primarily on nekton, micronekton and zooplankton. However, the dominant fish species utilizing common food organisms belonged to different assemblages. This pattern of assemblage structure is characteristic of weak inter-specific competition for food and appears to be an important factor underlying increased biomass of demersal fish.
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

Submitter: 高橋 豊美

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