Vertical distribution and prey of walleye pollock in the northern Japan Sea
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, tempera...
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Online Access: | http://hdl.handle.net/2115/38560 https://doi.org/10.2331/fishsci.64.686 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/38560 2023-05-15T18:32:51+02:00 Vertical distribution and prey of walleye pollock in the northern Japan Sea Kooka, Kouji Takatsu, Tetsuya Kamei, Yoshihiko Nakatani, Toshikuni Takahashi, Toyomi http://hdl.handle.net/2115/38560 https://doi.org/10.2331/fishsci.64.686 eng eng Japanese Society of Scientific Fisheries http://hdl.handle.net/2115/38560 Fisheries Science, 64(5): 686-693 http://dx.doi.org/10.2331/fishsci.64.686 © 1998 公益社団法人日本水産学会 © 1998 The Japanese Society of Fisheries Science walleye pollock vertical distribution Themisto japonica Thysanoessa longipes Sagitta elegans Japan Sea 663 article fthokunivhus https://doi.org/10.2331/fishsci.64.686 2022-11-18T01:01:45Z 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. Article in Journal/Newspaper Theragra chalcogramma Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Fisheries science 64 5 686 693 |
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Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
walleye pollock vertical distribution Themisto japonica Thysanoessa longipes Sagitta elegans Japan Sea 663 |
spellingShingle |
walleye pollock vertical distribution Themisto japonica Thysanoessa longipes Sagitta elegans Japan Sea 663 Kooka, Kouji Takatsu, Tetsuya Kamei, Yoshihiko Nakatani, Toshikuni Takahashi, Toyomi Vertical distribution and prey of walleye pollock in the northern Japan Sea |
topic_facet |
walleye pollock vertical distribution Themisto japonica Thysanoessa longipes Sagitta elegans Japan Sea 663 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Kooka, Kouji Takatsu, Tetsuya Kamei, Yoshihiko Nakatani, Toshikuni Takahashi, Toyomi |
author_facet |
Kooka, Kouji Takatsu, Tetsuya Kamei, Yoshihiko Nakatani, Toshikuni Takahashi, Toyomi |
author_sort |
Kooka, Kouji |
title |
Vertical distribution and prey of walleye pollock in the northern Japan Sea |
title_short |
Vertical distribution and prey of walleye pollock in the northern Japan Sea |
title_full |
Vertical distribution and prey of walleye pollock in the northern Japan Sea |
title_fullStr |
Vertical distribution and prey of walleye pollock in the northern Japan Sea |
title_full_unstemmed |
Vertical distribution and prey of walleye pollock in the northern Japan Sea |
title_sort |
vertical distribution and prey of walleye pollock in the northern japan sea |
publisher |
Japanese Society of Scientific Fisheries |
url |
http://hdl.handle.net/2115/38560 https://doi.org/10.2331/fishsci.64.686 |
genre |
Theragra chalcogramma |
genre_facet |
Theragra chalcogramma |
op_relation |
http://hdl.handle.net/2115/38560 Fisheries Science, 64(5): 686-693 http://dx.doi.org/10.2331/fishsci.64.686 |
op_rights |
© 1998 公益社団法人日本水産学会 © 1998 The Japanese Society of Fisheries Science |
op_doi |
https://doi.org/10.2331/fishsci.64.686 |
container_title |
Fisheries science |
container_volume |
64 |
container_issue |
5 |
container_start_page |
686 |
op_container_end_page |
693 |
_version_ |
1766217053738369024 |