Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics
Managing mixed fisheries requires understanding fishers’ behaviour to allow predicting future fisheries distribution and impact on marine ecosystems. A new approach was developed to compare fine-scale fishing effort distribution of Eastern English Channel (EEC) bottom trawlers to the monthly and spa...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/cjfas-2017-0529 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0529 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0529 |
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crcansciencepubl:10.1139/cjfas-2017-0529 2024-04-28T08:19:32+00:00 Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics Bourdaud, Pierre Travers-Trolet, Morgane Vermard, Youen Marchal, Paul 2019 http://dx.doi.org/10.1139/cjfas-2017-0529 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0529 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0529 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 4, page 586-596 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2019 crcansciencepubl https://doi.org/10.1139/cjfas-2017-0529 2024-04-02T06:55:54Z Managing mixed fisheries requires understanding fishers’ behaviour to allow predicting future fisheries distribution and impact on marine ecosystems. A new approach was developed to compare fine-scale fishing effort distribution of Eastern English Channel (EEC) bottom trawlers to the monthly and spatially resolved abundance distributions of commercial species. First, the added value of using species-specific spatial overlap metric to quantify effective fishing effort and improve the relationship between fishing effort and fishing mortality was assessed. Second, based on the Ideal Free Distribution (IFD) theory, the species-specific weights given by fishers to different species were estimated by maximizing the overlap between target species assemblage and effort distributions in October. At a seasonal scale, our results emphasized the importance of cuttlefish (Sepia officinalis) and red mullet (Mullus surmuletus) for the global distribution of EEC bottom trawlers. In October, cuttlefish and red mullet were clearly more determining fishers’ location choice than historically harvested species and also than the overall expected revenue. This is likely due to external constraints such as low cod (Gadus morhua) quota, causing IFD assumptions violated. This study evidenced the importance of getting good insights into spatiotemporal distributions of stocks and fleets to understand fishers’ behaviour and improve mixed fisheries management advice. Article in Journal/Newspaper Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 76 4 586 596 |
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Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Bourdaud, Pierre Travers-Trolet, Morgane Vermard, Youen Marchal, Paul Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Managing mixed fisheries requires understanding fishers’ behaviour to allow predicting future fisheries distribution and impact on marine ecosystems. A new approach was developed to compare fine-scale fishing effort distribution of Eastern English Channel (EEC) bottom trawlers to the monthly and spatially resolved abundance distributions of commercial species. First, the added value of using species-specific spatial overlap metric to quantify effective fishing effort and improve the relationship between fishing effort and fishing mortality was assessed. Second, based on the Ideal Free Distribution (IFD) theory, the species-specific weights given by fishers to different species were estimated by maximizing the overlap between target species assemblage and effort distributions in October. At a seasonal scale, our results emphasized the importance of cuttlefish (Sepia officinalis) and red mullet (Mullus surmuletus) for the global distribution of EEC bottom trawlers. In October, cuttlefish and red mullet were clearly more determining fishers’ location choice than historically harvested species and also than the overall expected revenue. This is likely due to external constraints such as low cod (Gadus morhua) quota, causing IFD assumptions violated. This study evidenced the importance of getting good insights into spatiotemporal distributions of stocks and fleets to understand fishers’ behaviour and improve mixed fisheries management advice. |
format |
Article in Journal/Newspaper |
author |
Bourdaud, Pierre Travers-Trolet, Morgane Vermard, Youen Marchal, Paul |
author_facet |
Bourdaud, Pierre Travers-Trolet, Morgane Vermard, Youen Marchal, Paul |
author_sort |
Bourdaud, Pierre |
title |
Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
title_short |
Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
title_full |
Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
title_fullStr |
Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
title_full_unstemmed |
Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
title_sort |
improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cjfas-2017-0529 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0529 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0529 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 4, page 586-596 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2017-0529 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
76 |
container_issue |
4 |
container_start_page |
586 |
op_container_end_page |
596 |
_version_ |
1797582990988017664 |