Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration

Kotwicki, Stan and Buckley, Troy W. and Honkalehto, Taina and Walters, Gary (2005) Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration. Fishery Bulletin, 103(4), pp. 574-587.

[img]
Preview
PDF (The document's language is English .) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (1236Kb) | Preview
Official URL: http://fishbull.noaa.gov/1034/kotw.pdf

Abstract

Aspects of the feeding migration of walleye pollock (Theragra chalcogramma) in the eastern Bering Sea (EBS) were investigated by examining the relationship between temperatures and densities of fish encountered during acoustic and bottom trawl surveys conducted in spring and summer between 1982 and 2001. Bottom temperature was used as an indicator of spring and summer warming of the EBS. Clusters of survey stations were identified where the density of walleye pollock generally increased or decreased with increasing water temperature. Inferences about the direction and magnitude of the spring and summer feeding migration were made for five length categories of walleye pollock. Generally, feeding migrations appeared to be northward and shoreward, and the magnitude of this migration appeared to increase with walleye pollock size up to 50 cm. Pollock larger then 50 cm showed limited migratory behavior. Pollock may benefit from northward feeding migrations because of the changes in temperature, zooplankton production, and light conditions. Ongoing climate changes may affect pollock distribution and create new challenges for pollock management in the EBS.

Item Type: Article
Title: Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration
Personal Creator/Author:
CreatorsEmail
Kotwicki, Stan
Buckley, Troy W.
Honkalehto, Taina
Walters, Gary
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 103
Number: 4
Page Range: pp. 574-587
Date: 2005
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 9016
Depositing User: Patti M. Marraro
Date Deposited: 03 Aug 2012 15:19
Last Modified: 03 Aug 2012 15:19
URI: http://aquaticcommons.org/id/eprint/9016

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...