Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration
Aspects of the feeding migration of walleye pollock (Theragra chalcogramma) in the eastern Bering Sea (EBS) were investigated by examining the relationship betweentemperatures 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 feedingmigration 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 sizeup to 50 cm. Pollock larger then 50 cm showed limited migratory behavior. Pollock may benefit from northwardfeeding 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.
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Language: | English |
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2005
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Subjects: | Biology, Ecology, Fisheries, |
Online Access: | http://hdl.handle.net/1834/25628 |
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dig-aquadocs-1834-256282021-06-30T03:13:51Z Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration Kotwicki, Stan Buckley, Troy W. Honkalehto, Taina Walters, Gary Biology Ecology Fisheries Aspects of the feeding migration of walleye pollock (Theragra chalcogramma) in the eastern Bering Sea (EBS) were investigated by examining the relationship betweentemperatures 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 feedingmigration 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 sizeup to 50 cm. Pollock larger then 50 cm showed limited migratory behavior. Pollock may benefit from northwardfeeding 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. 2021-06-24T16:21:22Z 2021-06-24T16:21:22Z 2005 article TRUE 0090-0656 http://hdl.handle.net/1834/25628 en http://fishbull.noaa.gov/1034/kotw.pdf application/pdf application/pdf 574-587 http://aquaticcommons.org/id/eprint/9016 403 2012-08-03 15:19:44 9016 United States National Marine Fisheries Service |
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Biology Ecology Fisheries Biology Ecology Fisheries Kotwicki, Stan Buckley, Troy W. Honkalehto, Taina Walters, Gary Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration |
description |
Aspects of the feeding migration of walleye pollock (Theragra chalcogramma) in the eastern Bering Sea (EBS) were investigated by examining the relationship betweentemperatures 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 feedingmigration 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 sizeup to 50 cm. Pollock larger then 50 cm showed limited migratory behavior. Pollock may benefit from northwardfeeding 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. |
format |
article |
topic_facet |
Biology Ecology Fisheries |
author |
Kotwicki, Stan Buckley, Troy W. Honkalehto, Taina Walters, Gary |
author_facet |
Kotwicki, Stan Buckley, Troy W. Honkalehto, Taina Walters, Gary |
author_sort |
Kotwicki, Stan |
title |
Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration |
title_short |
Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration |
title_full |
Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration |
title_fullStr |
Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration |
title_full_unstemmed |
Variation in the distribution of walleye pollock (Theragra chalcogramma) with temperature and implications for seasonal migration |
title_sort |
variation in the distribution of walleye pollock (theragra chalcogramma) with temperature and implications for seasonal migration |
publishDate |
2005 |
url |
http://hdl.handle.net/1834/25628 |
work_keys_str_mv |
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_version_ |
1756078055147700224 |