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Title: 北部日本海中層に生息するスケトウダラの春季と秋季における食性
Other Titles: Food Habits of Walleye Pollock Inhabiting the Mesopelagic Zone in the Northern Japan Sea in Spring and Autumn
Authors: 小岡, 孝治1 Browse this author
高津, 哲也2 Browse this author →KAKEN DB
亀井, 佳彦3 Browse this author
中谷, 敏邦4 Browse this author →KAKEN DB
高橋, 豊美5 Browse this author →KAKEN DB
Authors(alt): Kooka, Kouji1
Takatsu, Tetsuya2
Kamei, Yoshihiko3
Nakatani, Toshikuni4
Takahashi, Toyomi5
Keywords: スケトウダラ
Issue Date: 1997
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: 63
Issue: 4
Start Page: 537
End Page: 541
Publisher DOI: 10.2331/suisan.63.537
Abstract: The diet and feeding intensity of walleye pollock Theragra chalcogramma were investigated in April and October 1993, and in April 1994. Specimens ranging from 262 to 456mm in standard length were sampled with a mid-water trawl off Hiyama Subprefecture and Aomori Prefecture in the northern Japan Sea. The main food items were large-sized zooplankton. In April, pollock fed chiefly on euphausiids (Thysanoessa longipes), chaetognaths, and hyperiid amphipods (Themisto japonica). In October, the main food organisms were hyperiid amphipods (T. japonica). Stomach-content weight indices indicated that the feeding intensity of pollock was stronger in April (after spawning) than in October (before spawning). The numerical compositions of food categories in April differed among sampling stations. Such differences were not observed in October. It seems likely that the distinct variation of diets in April is ascribed to geographic differences in zooplankton composition in the mesopelagic zone.
Rights: © 1997 公益社団法人日本水産学会
© 1997 The Japanese Society of Fisheries Science
Type: article
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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