Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment
Abstract The edible crab (Cancer pagurus), which is abundant along the Norwegian coast north to Troms County, has been exploited in Norway since the start of the 20th century. The main fishery is in Mid-Norway and Helgeland (63°–67°N), which together land 75% of the Norwegian catch. The fishery is r...
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Language: | English |
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Oxford University Press (OUP)
2006
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Online Access: | http://dx.doi.org/10.1016/j.icesjms.2005.10.004 http://academic.oup.com/icesjms/article-pdf/63/3/421/29125058/63-3-421.pdf |
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croxfordunivpr:10.1016/j.icesjms.2005.10.004 2024-09-15T18:10:51+00:00 Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment Woll, Astrid K. van der Meeren, Gro I. Fossen, Inge 2006 http://dx.doi.org/10.1016/j.icesjms.2005.10.004 http://academic.oup.com/icesjms/article-pdf/63/3/421/29125058/63-3-421.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 63, issue 3, page 421-433 ISSN 1095-9289 1054-3139 journal-article 2006 croxfordunivpr https://doi.org/10.1016/j.icesjms.2005.10.004 2024-08-05T04:29:14Z Abstract The edible crab (Cancer pagurus), which is abundant along the Norwegian coast north to Troms County, has been exploited in Norway since the start of the 20th century. The main fishery is in Mid-Norway and Helgeland (63°–67°N), which together land 75% of the Norwegian catch. The fishery is regulated by season, minimum legal size, and the discarding of soft or ovigerous females. Catches have never been systematically described, so this study presents data collected over 4 years by a reference fleet of professional fishers reporting the catch from four standardized trial traps set among their ordinary traps. Catch rate, catch composition, and size distribution from Mid-Norway/Helgeland are compared with the smaller crab fishery in Rogaland (59°N) and with new crab grounds off Vesterålen (69°N). Local variations in size and sex composition between and within region seemed partly to be caused by differences between exposed and sheltered regions, and between heavily and newly exploited grounds. Size distribution is used as an indicator to determine a suitable sampling strategy. The most efficient survey design is seemingly the collection of relatively small samples from many boats to reduce the between-vessel component of variation. A suggested strategy to obtain an abundance index would be to collect daily catch rates from all commercial landings. Article in Journal/Newspaper Helgeland Vesterålen Troms Oxford University Press ICES Journal of Marine Science 63 3 421 433 |
institution |
Open Polar |
collection |
Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract The edible crab (Cancer pagurus), which is abundant along the Norwegian coast north to Troms County, has been exploited in Norway since the start of the 20th century. The main fishery is in Mid-Norway and Helgeland (63°–67°N), which together land 75% of the Norwegian catch. The fishery is regulated by season, minimum legal size, and the discarding of soft or ovigerous females. Catches have never been systematically described, so this study presents data collected over 4 years by a reference fleet of professional fishers reporting the catch from four standardized trial traps set among their ordinary traps. Catch rate, catch composition, and size distribution from Mid-Norway/Helgeland are compared with the smaller crab fishery in Rogaland (59°N) and with new crab grounds off Vesterålen (69°N). Local variations in size and sex composition between and within region seemed partly to be caused by differences between exposed and sheltered regions, and between heavily and newly exploited grounds. Size distribution is used as an indicator to determine a suitable sampling strategy. The most efficient survey design is seemingly the collection of relatively small samples from many boats to reduce the between-vessel component of variation. A suggested strategy to obtain an abundance index would be to collect daily catch rates from all commercial landings. |
format |
Article in Journal/Newspaper |
author |
Woll, Astrid K. van der Meeren, Gro I. Fossen, Inge |
spellingShingle |
Woll, Astrid K. van der Meeren, Gro I. Fossen, Inge Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment |
author_facet |
Woll, Astrid K. van der Meeren, Gro I. Fossen, Inge |
author_sort |
Woll, Astrid K. |
title |
Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment |
title_short |
Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment |
title_full |
Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment |
title_fullStr |
Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment |
title_full_unstemmed |
Spatial variation in abundance and catch composition of Cancer pagurus in Norwegian waters: biological reasoning and implications for assessment |
title_sort |
spatial variation in abundance and catch composition of cancer pagurus in norwegian waters: biological reasoning and implications for assessment |
publisher |
Oxford University Press (OUP) |
publishDate |
2006 |
url |
http://dx.doi.org/10.1016/j.icesjms.2005.10.004 http://academic.oup.com/icesjms/article-pdf/63/3/421/29125058/63-3-421.pdf |
genre |
Helgeland Vesterålen Troms |
genre_facet |
Helgeland Vesterålen Troms |
op_source |
ICES Journal of Marine Science volume 63, issue 3, page 421-433 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2005.10.004 |
container_title |
ICES Journal of Marine Science |
container_volume |
63 |
container_issue |
3 |
container_start_page |
421 |
op_container_end_page |
433 |
_version_ |
1810448421977325568 |