The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys
Quantitative assessment of semidemersal fish such as walleye pollock ( Theragra chalcogramma ) is difficult because the proportion of walleye pollock available to standardized surveys varies temporally and spatially. The US National Marine Fisheries Service’s Alaska Fisheries Science Center conducts...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2009
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Online Access: | http://dx.doi.org/10.1139/f09-055 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F09-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/F09-055 |
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crcansciencepubl:10.1139/f09-055 2023-12-17T10:28:09+01:00 The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys Kotwicki, Stan De Robertis, Alex von Szalay, Paul Towler, Rick Jech, J. Michael 2009 http://dx.doi.org/10.1139/f09-055 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F09-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/F09-055 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 66, issue 6, page 983-994 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2009 crcansciencepubl https://doi.org/10.1139/f09-055 2023-11-19T13:38:18Z Quantitative assessment of semidemersal fish such as walleye pollock ( Theragra chalcogramma ) is difficult because the proportion of walleye pollock available to standardized surveys varies temporally and spatially. The US National Marine Fisheries Service’s Alaska Fisheries Science Center conducts bottom trawl (BT) surveys to estimate the demersal portion of the walleye pollock population and acoustic trawl (AT) surveys to estimate the pelagic portion. Both surveys are conducted during daylight hours to minimize variability due to diel changes in vertical distribution. To test if daytime near-bottom light intensity affects the proportion of walleye pollock available to the BT survey, we concurrently measured light and walleye pollock abundance on the Bering Sea shelf. Logistic regression models demonstrated that both light and depth affected walleye pollock abundance estimates by either BT or AT surveys, with more walleye pollock available to the BT survey under high illumination and at shallow depths and less walleye pollock available to the AT survey under these conditions. This finding suggests that daytime survey catchability for walleye pollock depends on depth and light intensity and that incorporation of light measurements could improve the precision of abundance estimates of semidemersal species such as walleye pollock. Article in Journal/Newspaper Bering Sea Theragra chalcogramma Alaska Canadian Science Publishing (via Crossref) Bering Sea Canadian Journal of Fisheries and Aquatic Sciences 66 6 983 994 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Kotwicki, Stan De Robertis, Alex von Szalay, Paul Towler, Rick The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Quantitative assessment of semidemersal fish such as walleye pollock ( Theragra chalcogramma ) is difficult because the proportion of walleye pollock available to standardized surveys varies temporally and spatially. The US National Marine Fisheries Service’s Alaska Fisheries Science Center conducts bottom trawl (BT) surveys to estimate the demersal portion of the walleye pollock population and acoustic trawl (AT) surveys to estimate the pelagic portion. Both surveys are conducted during daylight hours to minimize variability due to diel changes in vertical distribution. To test if daytime near-bottom light intensity affects the proportion of walleye pollock available to the BT survey, we concurrently measured light and walleye pollock abundance on the Bering Sea shelf. Logistic regression models demonstrated that both light and depth affected walleye pollock abundance estimates by either BT or AT surveys, with more walleye pollock available to the BT survey under high illumination and at shallow depths and less walleye pollock available to the AT survey under these conditions. This finding suggests that daytime survey catchability for walleye pollock depends on depth and light intensity and that incorporation of light measurements could improve the precision of abundance estimates of semidemersal species such as walleye pollock. |
author2 |
Jech, J. Michael |
format |
Article in Journal/Newspaper |
author |
Kotwicki, Stan De Robertis, Alex von Szalay, Paul Towler, Rick |
author_facet |
Kotwicki, Stan De Robertis, Alex von Szalay, Paul Towler, Rick |
author_sort |
Kotwicki, Stan |
title |
The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys |
title_short |
The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys |
title_full |
The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys |
title_fullStr |
The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys |
title_full_unstemmed |
The effect of light intensity on the availability of walleye pollock (Theragra chalcogramma) to bottom trawl and acoustic surveys |
title_sort |
effect of light intensity on the availability of walleye pollock (theragra chalcogramma) to bottom trawl and acoustic surveys |
publisher |
Canadian Science Publishing |
publishDate |
2009 |
url |
http://dx.doi.org/10.1139/f09-055 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F09-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/F09-055 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Theragra chalcogramma Alaska |
genre_facet |
Bering Sea Theragra chalcogramma Alaska |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 66, issue 6, page 983-994 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f09-055 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
66 |
container_issue |
6 |
container_start_page |
983 |
op_container_end_page |
994 |
_version_ |
1785580183598661632 |