Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods
Abstract The red king crab (Paralithodes camtschaticus) is native to the Bering Sea, but was deliberately introduced to the Barents Sea during the 1960s. Since then, the red king crab has spread to Norwegian waters, and crab densities have increased sufficiently to support a coastal fishery. Informa...
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Oxford University Press (OUP)
2014
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsu138 http://academic.oup.com/icesjms/article-pdf/72/2/642/31230929/fsu138.pdf |
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croxfordunivpr:10.1093/icesjms/fsu138 2024-06-23T07:51:38+00:00 Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods Windsland, Kristin 2014 http://dx.doi.org/10.1093/icesjms/fsu138 http://academic.oup.com/icesjms/article-pdf/72/2/642/31230929/fsu138.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 72, issue 2, page 642-650 ISSN 1054-3139 1095-9289 journal-article 2014 croxfordunivpr https://doi.org/10.1093/icesjms/fsu138 2024-06-04T06:14:43Z Abstract The red king crab (Paralithodes camtschaticus) is native to the Bering Sea, but was deliberately introduced to the Barents Sea during the 1960s. Since then, the red king crab has spread to Norwegian waters, and crab densities have increased sufficiently to support a coastal fishery. Information about total and natural mortality, which is important to ensure adequate management, is lacking. Estimates of annual total mortality (Z) were calculated using length-converted catch curves in three periods of different levels of exploitation. Separate analyses were run on trap and trawl data as well as on original and catch per unit effort-corrected data. Natural mortality was estimated using a linear regression of total mortality and exploitation level and by using indirect methods based on life history parameters. There was a significant increase in Z throughout the consecutive periods in both sexes. In males, the increase coincided with the increase in exploitation level. The increase in female mortality, which was not explained by exploitation level, is probably an effect of the increase in male mortality. Natural mortality (M), estimated using indirect methods, averaged 0.23 for both sexes. The estimated M using linear regression was 0.37/0.44, which may be an overestimate. Article in Journal/Newspaper Barents Sea Bering Sea Paralithodes camtschaticus Red king crab Oxford University Press Barents Sea Bering Sea ICES Journal of Marine Science 72 2 642 650 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract The red king crab (Paralithodes camtschaticus) is native to the Bering Sea, but was deliberately introduced to the Barents Sea during the 1960s. Since then, the red king crab has spread to Norwegian waters, and crab densities have increased sufficiently to support a coastal fishery. Information about total and natural mortality, which is important to ensure adequate management, is lacking. Estimates of annual total mortality (Z) were calculated using length-converted catch curves in three periods of different levels of exploitation. Separate analyses were run on trap and trawl data as well as on original and catch per unit effort-corrected data. Natural mortality was estimated using a linear regression of total mortality and exploitation level and by using indirect methods based on life history parameters. There was a significant increase in Z throughout the consecutive periods in both sexes. In males, the increase coincided with the increase in exploitation level. The increase in female mortality, which was not explained by exploitation level, is probably an effect of the increase in male mortality. Natural mortality (M), estimated using indirect methods, averaged 0.23 for both sexes. The estimated M using linear regression was 0.37/0.44, which may be an overestimate. |
format |
Article in Journal/Newspaper |
author |
Windsland, Kristin |
spellingShingle |
Windsland, Kristin Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods |
author_facet |
Windsland, Kristin |
author_sort |
Windsland, Kristin |
title |
Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods |
title_short |
Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods |
title_full |
Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods |
title_fullStr |
Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods |
title_full_unstemmed |
Total and natural mortality of red king crab (Paralithodes camtschaticus) in Norwegian waters: catch–curve analysis and indirect estimation methods |
title_sort |
total and natural mortality of red king crab (paralithodes camtschaticus) in norwegian waters: catch–curve analysis and indirect estimation methods |
publisher |
Oxford University Press (OUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1093/icesjms/fsu138 http://academic.oup.com/icesjms/article-pdf/72/2/642/31230929/fsu138.pdf |
geographic |
Barents Sea Bering Sea |
geographic_facet |
Barents Sea Bering Sea |
genre |
Barents Sea Bering Sea Paralithodes camtschaticus Red king crab |
genre_facet |
Barents Sea Bering Sea Paralithodes camtschaticus Red king crab |
op_source |
ICES Journal of Marine Science volume 72, issue 2, page 642-650 ISSN 1054-3139 1095-9289 |
op_doi |
https://doi.org/10.1093/icesjms/fsu138 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
2 |
container_start_page |
642 |
op_container_end_page |
650 |
_version_ |
1802642757965053952 |