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Geographical variations in infection by larval Anisakis simplex and Contracaecum osculatum (Nematoda, Anisakidae) in walleye pollock Theragra chalcogramma stocks off Hokkaido, Japan

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Title: Geographical variations in infection by larval Anisakis simplex and Contracaecum osculatum (Nematoda, Anisakidae) in walleye pollock Theragra chalcogramma stocks off Hokkaido, Japan
Authors: Konishi, Kenji Browse this author
Sakurai, Yasunori Browse this author →KAKEN DB
Keywords: Anisakidae
Anisakis simplex
Contracaecum osculatum
geographic variation
Nematoda
Theragra chalcogramma
walleye pollock
Issue Date: Jun-2002
Publisher: The Japanese Society of Scientific Fisheries
Journal Title: Fisheries Science
Volume: 68
Issue: 3
Start Page: 534
End Page: 542
Publisher DOI: 10.1046/j.1444-2906.2002.00459.x
Abstract: Stocks of walleye pollock Theragra chalcogramma collected from: (i) the Sea of Japan (off Rebun Island and Kumaishi); (ii) the Pacific coast (off Shikabe and eastern Hokkaido); and (iii) Nemuro Strait off Hokkaido, northern Japan, were examined for anisakid nematodes during December 1999 to February 2000, and the prevalence and abundance of Anisakis simplex and Contracaecum osculatum larvae were compared among the various sampling sites for fish of the same size and age. Anisakis simplex was generally more abundant than C. osculatum. Infection by A. simplex varied between the aforementioned stocks of walleye pollock as well as within stocks, whereby fish from off Rebun Island and Nemuro Strait were infected the most, followed by those from off the Pacific coast and Kumaishi. Infection by C. osculatum differed between the host stocks, and C. osculatum was the most abundant among the fish from Nemuro Strait. The infection variations seemed to be due to differences in host growth rate, host feeding habit, and the distribution of marine mammal final hosts. The results indicate that these two larval nematodes are useful biological indicators for the population study of walleye pollock in Japanese waters.
Rights: © 2002 公益社団法人日本水産学会
© 2002 The Japanese Society of Fisheries Science
Type: article
URI: http://hdl.handle.net/2115/35583
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: 桜井 泰憲

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