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Vertical distribution and prey of walleye pollock in the northern Japan Sea

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Title: Vertical distribution and prey of walleye pollock in the northern Japan Sea
Authors: Kooka, Kouji Browse this author
Takatsu, Tetsuya Browse this author →KAKEN DB
Kamei, Yoshihiko Browse this author
Nakatani, Toshikuni Browse this author →KAKEN DB
Takahashi, Toyomi Browse this author
Keywords: walleye pollock
vertical distribution
Themisto japonica
Thysanoessa longipes
Sagitta elegans
Japan Sea
Issue Date: 1998
Publisher: Japanese Society of Scientific Fisheries
Journal Title: Fisheries Science
Volume: 64
Issue: 5
Start Page: 686
End Page: 693
Publisher DOI: 10.2331/fishsci.64.686
Abstract: Vertical distributions of adult walleye pollock Theragra chalcogramma and oceanographic conditions were examined in the northern Japan Sea. In the daytime, most walleye pollock were distributed from 150 to 250m depth in April and from 400 to 500m depth in October. Between 150 and 500m depth, temperatures in October (0.4-8.8℃) were similar to those in April (0.5-5.4℃), salinity levels were fairly uniform in both months (34.0-34.2 PSU), and dissolved oxygen concentrations were 4.6-6.1ml/l in April and 4.7-6.4ml/l in October. The main foods of walleye pollock in April were the amphipod Themisto japonica, the euphausiid Thysanoessa longipes, and the chaetognath Sagitta elegans. Daytime weighted mean depths of T. longipes were significantly greater in October than in April. Biomass of T. longipes in the habitat of walleye pollock was significantly greater than other layers in both months. The seasonal change in vertical distribution of walleye pollock is presumably related to food availability of T. longipes.
Rights: © 1998 公益社団法人日本水産学会
© 1998 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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