Summer diet and feeding strategy of Pacific cod (Gadus macrocephalus) inhabiting the southern coast of Hokkaido, Japan

Wang, Rongfu; Chimura, Masayuki; Sadayasu, Kazuhiro; Ishino, Mitsuhiro; Yamamura, Orio

Summer diet and feeding strategy of Pacific cod (Gadus macrocephalus) inhabiting the southern coast of Hokkaido, Japan

Wang, Rongfu; Chimura, Masayuki; Sadayasu, Kazuhiro et al.

Marine biology research, 2023, 18(7-8), 435-447

Permalink : https://hdl.handle.net/2115/90823

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アクセス権	open access
URI	https://hdl.handle.net/2115/90823
タイトル	Summer diet and feeding strategy of Pacific cod (Gadus macrocephalus) inhabiting the southern coast of Hokkaido, Japan
著者	Wang, Rongfu ; Chimura, Masayuki ; Sadayasu, Kazuhiro ; Ishino, Mitsuhiro ; Yamamura, Orio
著者名 Wang, Rongfu
著者名 Chimura, Masayuki
著者名 Sadayasu, Kazuhiro
e-Rad_Researcher 60781846 著者名 Ishino, Mitsuhiro
e-Rad_Researcher 20371784 著者名 Yamamura, Orio
言語	英語
キーワード	Pacific cod
	stomach contents
	diet composition
	feeding strategy
	Hokkaido
発行日	2023-12-05
出版者	Landes Bioscience
収録物名	Marine biology research
巻(号)	18(7-8)
ページ	435-447
抄録	The ontogenetic and interannual variations in the diet and feeding strategy of Pacific cod (Gadus macrocephalus) were examined based on 1302 specimens collected by a trawling net off the southern coast of Hokkaido from late June to early July during 2016-2020. The diet comprised 63 species (13 taxa). Fish was the most important prey, followed by decapod crustaceans. In 2016, walleye pollock (Gadus chalcogrammus) was the dominant fish prey species, while amphipods, decapods and Japanese lanternfish (Notoscopelus japonicus) were prominent in the diet in 2017. Japanese sardine (Sardinops melanostictus) were more predominant during 2018-2020. An ontogenetic comparison of diet indicated that smaller individuals (<= 400 mm standard length, SL) preyed mainly on small prey items, such as decapod crustaceans and polychaetes, whereas larger individuals (>400 mm SL) preyed mainly on fish. Moreover, prey size exhibited a significant increasing trend with predator body length. These results suggest that Pacific cod has a flexible feeding strategy that differs by life stage. The updated information on predator-prey relationships provided herein improves our understanding of energy flow in the marine ecosystem and could facilitate ecosystem-based fishery management strategies.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This is an Accepted Manuscript of an article published by Taylor & Francis in Marine biology research on 05 December 2022, available online: http://www.tandfonline.com/10.1080/17451000.2022.2147948.
PISSN	1745-1000
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1080/17451000.2022.2147948