| Title |
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en
Vertical distribution and prey of walleye pollock in the northern Japan Sea
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| Creator |
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| Accessrights |
open access |
| Rights |
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ja
© 1998 公益社団法人日本水産学会
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en
© 1998 The Japanese Society of Fisheries Science
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| Subject |
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Other
en
walleye pollock
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Other
en
vertical distribution
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Other
en
Themisto japonica
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Other
en
Thysanoessa longipes
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Other
en
Sagitta elegans
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Other
en
Japan Sea
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NDC
663
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| Description |
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Abstract
en
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.
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| Publisher |
en
Japanese Society of Scientific Fisheries
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| Date |
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| Language |
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| Resource Type |
journal article |
| Version Type |
VoR |
| Identifier |
HDL
http://hdl.handle.net/2115/38560
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| Relation |
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isIdenticalTo
DOI
https://doi.org/10.2331/fishsci.64.686
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| Journal |
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PISSN
0919-9268
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NCID
AA10993718
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en
Fisheries Science
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Volume Number64
Issue Number5
Page Start686
Page End693
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| File |
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| Oaidate |
2023-07-26 |
