How effective is electronic monitoring in mixed bottom-trawl fisheries?
In the context of the landing obligation under the European Common Fisheries Policy, electronic monitoring (EM) is often presented as one of the solutions to fully document catches. EM includes video monitoring to record the catch handling process on board the vessels. This study evaluated the effic...
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ftunivwagenin:oai:library.wur.nl:wurpubs/479108 2024-02-04T10:00:31+01:00 How effective is electronic monitoring in mixed bottom-trawl fisheries? van Helmond, A.T.M. Chen, C. Poos, J.J. 2015 application/pdf https://research.wur.nl/en/publications/how-effective-is-electronic-monitoring-in-mixed-bottom-trawl-fish https://doi.org/10.1093/icesjms/fsu200 en eng https://edepot.wur.nl/323478 https://research.wur.nl/en/publications/how-effective-is-electronic-monitoring-in-mixed-bottom-trawl-fish doi:10.1093/icesjms/fsu200 info:eu-repo/semantics/restrictedAccess Wageningen University & Research ICES Journal of Marine Science 72 (2015) 4 ISSN: 1054-3139 computer vision discards fish species recognition management info:eu-repo/semantics/article Article/Letter to editor info:eu-repo/semantics/publishedVersion 2015 ftunivwagenin https://doi.org/10.1093/icesjms/fsu200 2024-01-10T23:19:11Z In the context of the landing obligation under the European Common Fisheries Policy, electronic monitoring (EM) is often presented as one of the solutions to fully document catches. EM includes video monitoring to record the catch handling process on board the vessels. This study evaluated the efficacy of EM for cod (Gadus morhua) catches on vessels in a mixed bottom-trawl fishery and tested the hypothesis that cod catches are difficult to detect with video monitoring, specifically in catches with large volumes of bycatch. In 2011, a catch quota pilot study started for cod in the Dutch bottom-trawl fishery in which EM was used as an audit system to review the consistency of reported cod catches. Eleven vessels joined the pilot study on a voluntary basis. Participants received a 30% increase in individual quota for cod and were compensated with extra effort in days at sea. In return, all cod catches were counted against their cod quota. This mixed bottom-trawl fishery differs from fisheries where EM was proven to be a successful method, e.g. hook and line or single-species fisheries with low bycatch volumes. We conclude that distinguishing small numbers of cod in catches of mixed bottom-trawl fisheries is difficult because there is a low correlation between logbook and video data (Pearson r = 0.17). We expect similar difficulty in other mixed demersal trawl fisheries with large bycatch volumes, when similar-looking species are targeted. Meanwhile, implementing a landing obligation will pose large challenges for fisheries with large volumes of bycatch. Limitations in the applicability of EM to control one of the most common types of fisheries in Europe will be a burden on the implementation of the European landing obligation. Improved protocols and technical adaptations may reduce some of the limitations encountered in this study. Article in Journal/Newspaper Gadus morhua Wageningen UR (University & Research Centre): Digital Library The Landing ENVELOPE(-45.689,-45.689,-60.733,-60.733) ICES Journal of Marine Science 72 4 1192 1200 |
institution |
Open Polar |
collection |
Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
computer vision discards fish species recognition management |
spellingShingle |
computer vision discards fish species recognition management van Helmond, A.T.M. Chen, C. Poos, J.J. How effective is electronic monitoring in mixed bottom-trawl fisheries? |
topic_facet |
computer vision discards fish species recognition management |
description |
In the context of the landing obligation under the European Common Fisheries Policy, electronic monitoring (EM) is often presented as one of the solutions to fully document catches. EM includes video monitoring to record the catch handling process on board the vessels. This study evaluated the efficacy of EM for cod (Gadus morhua) catches on vessels in a mixed bottom-trawl fishery and tested the hypothesis that cod catches are difficult to detect with video monitoring, specifically in catches with large volumes of bycatch. In 2011, a catch quota pilot study started for cod in the Dutch bottom-trawl fishery in which EM was used as an audit system to review the consistency of reported cod catches. Eleven vessels joined the pilot study on a voluntary basis. Participants received a 30% increase in individual quota for cod and were compensated with extra effort in days at sea. In return, all cod catches were counted against their cod quota. This mixed bottom-trawl fishery differs from fisheries where EM was proven to be a successful method, e.g. hook and line or single-species fisheries with low bycatch volumes. We conclude that distinguishing small numbers of cod in catches of mixed bottom-trawl fisheries is difficult because there is a low correlation between logbook and video data (Pearson r = 0.17). We expect similar difficulty in other mixed demersal trawl fisheries with large bycatch volumes, when similar-looking species are targeted. Meanwhile, implementing a landing obligation will pose large challenges for fisheries with large volumes of bycatch. Limitations in the applicability of EM to control one of the most common types of fisheries in Europe will be a burden on the implementation of the European landing obligation. Improved protocols and technical adaptations may reduce some of the limitations encountered in this study. |
format |
Article in Journal/Newspaper |
author |
van Helmond, A.T.M. Chen, C. Poos, J.J. |
author_facet |
van Helmond, A.T.M. Chen, C. Poos, J.J. |
author_sort |
van Helmond, A.T.M. |
title |
How effective is electronic monitoring in mixed bottom-trawl fisheries? |
title_short |
How effective is electronic monitoring in mixed bottom-trawl fisheries? |
title_full |
How effective is electronic monitoring in mixed bottom-trawl fisheries? |
title_fullStr |
How effective is electronic monitoring in mixed bottom-trawl fisheries? |
title_full_unstemmed |
How effective is electronic monitoring in mixed bottom-trawl fisheries? |
title_sort |
how effective is electronic monitoring in mixed bottom-trawl fisheries? |
publishDate |
2015 |
url |
https://research.wur.nl/en/publications/how-effective-is-electronic-monitoring-in-mixed-bottom-trawl-fish https://doi.org/10.1093/icesjms/fsu200 |
long_lat |
ENVELOPE(-45.689,-45.689,-60.733,-60.733) |
geographic |
The Landing |
geographic_facet |
The Landing |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science 72 (2015) 4 ISSN: 1054-3139 |
op_relation |
https://edepot.wur.nl/323478 https://research.wur.nl/en/publications/how-effective-is-electronic-monitoring-in-mixed-bottom-trawl-fish doi:10.1093/icesjms/fsu200 |
op_rights |
info:eu-repo/semantics/restrictedAccess Wageningen University & Research |
op_doi |
https://doi.org/10.1093/icesjms/fsu200 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
4 |
container_start_page |
1192 |
op_container_end_page |
1200 |
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1789965853564862464 |