Catchability and the spatial distribution of fishing vessels
A central problem when using commercial catch per unit effort (CPUE) as an index of fish stock abundance is that fishing vessels search for concentrations of fish. For a given stock abundance, CPUE may become high if the vessels succeed in finding patches of fish and low if the vessels distribute th...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2003
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Online Access: | http://dx.doi.org/10.1139/f03-018 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-018 |
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crcansciencepubl:10.1139/f03-018 2024-09-15T17:52:27+00:00 Catchability and the spatial distribution of fishing vessels Salthaug, Are Aanes, Sondre 2003 http://dx.doi.org/10.1139/f03-018 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-018 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 60, issue 3, page 259-268 ISSN 0706-652X 1205-7533 journal-article 2003 crcansciencepubl https://doi.org/10.1139/f03-018 2024-08-08T04:13:41Z A central problem when using commercial catch per unit effort (CPUE) as an index of fish stock abundance is that fishing vessels search for concentrations of fish. For a given stock abundance, CPUE may become high if the vessels succeed in finding patches of fish and low if the vessels distribute their catching operations more randomly. In this work, the relationship between catchability and two measures of the degree of spatial concentration of a trawl fleet (the fleet's spatial extent and the fleet's degree of spatial patchiness) is investigated for four different fish stocks. The catchability of northeast Arctic cod (Gadus morhua) is strongly related to the fleet's degree of spatial concentration, but the relationship is weaker for northeast Arctic haddock (Melanogrammus aeglefinus), and no relationships appear for two saithe (Pollachius virens) stocks. Our findings suggest that adjusting CPUE with a measure of the fleet's average degree of concentration relates CPUE more strongly with abundance for migratory stocks. Article in Journal/Newspaper Arctic cod Gadus morhua Northeast Arctic cod Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 60 3 259 268 |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A central problem when using commercial catch per unit effort (CPUE) as an index of fish stock abundance is that fishing vessels search for concentrations of fish. For a given stock abundance, CPUE may become high if the vessels succeed in finding patches of fish and low if the vessels distribute their catching operations more randomly. In this work, the relationship between catchability and two measures of the degree of spatial concentration of a trawl fleet (the fleet's spatial extent and the fleet's degree of spatial patchiness) is investigated for four different fish stocks. The catchability of northeast Arctic cod (Gadus morhua) is strongly related to the fleet's degree of spatial concentration, but the relationship is weaker for northeast Arctic haddock (Melanogrammus aeglefinus), and no relationships appear for two saithe (Pollachius virens) stocks. Our findings suggest that adjusting CPUE with a measure of the fleet's average degree of concentration relates CPUE more strongly with abundance for migratory stocks. |
format |
Article in Journal/Newspaper |
author |
Salthaug, Are Aanes, Sondre |
spellingShingle |
Salthaug, Are Aanes, Sondre Catchability and the spatial distribution of fishing vessels |
author_facet |
Salthaug, Are Aanes, Sondre |
author_sort |
Salthaug, Are |
title |
Catchability and the spatial distribution of fishing vessels |
title_short |
Catchability and the spatial distribution of fishing vessels |
title_full |
Catchability and the spatial distribution of fishing vessels |
title_fullStr |
Catchability and the spatial distribution of fishing vessels |
title_full_unstemmed |
Catchability and the spatial distribution of fishing vessels |
title_sort |
catchability and the spatial distribution of fishing vessels |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/f03-018 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-018 |
genre |
Arctic cod Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Gadus morhua Northeast Arctic cod |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 60, issue 3, page 259-268 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f03-018 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
60 |
container_issue |
3 |
container_start_page |
259 |
op_container_end_page |
268 |
_version_ |
1810294482261770240 |