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夏季の北海道太平洋沖陸棚斜面域におけるキチジの分布様式と栄養状態

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Title: 夏季の北海道太平洋沖陸棚斜面域におけるキチジの分布様式と栄養状態
Other Titles: Spatial distribution patterns and nutritional status of kichiji rockfish Sebastolobus macrochir in summer on the continental slope off the Pacific coast of Hokkaido, Japan
Authors: 大村, 敏昭1 Browse this author
濱津, 友紀2 Browse this author
山内, 務巨3 Browse this author
高橋, 豊美4 Browse this author
Authors(alt): Ohmura, Toshiaki1
Hamatsu, Tomonori2
Yamauchi, Michio3
Takahashi, Toyomi4
Keywords: 栄養状態
キチジ
餌料価値
肥満度
分布
陸棚斜面
Issue Date: 15-May-2006
Publisher: 日本水産学会
Journal Title: 日本水産学会誌
Journal Title(alt): Bulletin of the Japanese Society of Scientific Fisheries
Volume: 72
Issue: 3
Start Page: 430
End Page: 439
Publisher DOI: 10.2331/suisan.72.430
Abstract: The spatial distribution patterns and nutritional status of the kichiji rockfish Sebastolobus macrochir were investigated off the Pacific coast of Hokkaido during the summer of 2001-2004. Fish≤100mm SL were chiefly distributed at depths of 550-750m off the southeastern area of Cape Erimo where their principal prey, gammarid amphipods, were abundant. The 101-150mm SL fish were concentrated in shallow areas where their principal prey, the decapod Neocrangon communis, was abundant. Conversely, fish≥151mm SL were observed to utilize various prey items and were widely distributed in the study area, suggesting a foraging strategy to reduce the intra- and inter-specific competition for food and to obtain food efficiently. The condition factor and hepatosomatic index of S. macrochir tended to decrease with increased depth. Given that the principal prey of S. macrochir ranged from decapods (high energy content) to ophiuroids (low energy content) with increased depth, the variation in the nutritional status of fish could be related to differences in the energy content of their prey. Despite feeding on prey items with a relatively high energy content, the nutritional status of 101-150mm SL fish was low. This is probably due to the fact that the fish in this size class grow rapidly.
Rights: 本文データは学協会の許諾に基づきCiNiiから複製したものである
© 2006 公益社団法人日本水産学会
© 2006 The Japanese Society of Fisheries Science
(Relation)isversionof: http://ci.nii.ac.jp/naid/110004818301
Type: article
URI: http://hdl.handle.net/2115/38425
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 豊美

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