Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet
Abstract Fishermen make repeated choices with respect to when, where, and how to catch their target species. While these targeting tactics—and the factors shaping them—are known to fishers and some experts, knowledge about them is largely informal and not well utilized for management purposes. To fo...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsac207 https://academic.oup.com/icesjms/article-pdf/79/10/2709/47857067/fsac207.pdf |
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croxfordunivpr:10.1093/icesjms/fsac207 2023-05-15T15:27:37+02:00 Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet Liu, Xiaozi Hansen, Cecilie Nedreaas, Kjell Stockhausen, Hans Hagen Heino, Mikko Woods, Pamela Research Council of Norway 2022 http://dx.doi.org/10.1093/icesjms/fsac207 https://academic.oup.com/icesjms/article-pdf/79/10/2709/47857067/fsac207.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ CC-BY ICES Journal of Marine Science volume 79, issue 10, page 2709-2727 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2022 croxfordunivpr https://doi.org/10.1093/icesjms/fsac207 2022-12-29T15:30:13Z Abstract Fishermen make repeated choices with respect to when, where, and how to catch their target species. While these targeting tactics—and the factors shaping them—are known to fishers and some experts, knowledge about them is largely informal and not well utilized for management purposes. To formalize information on targeting tactics, we propose a set of methods combining model-based classification of target species with generalized linear models. We apply these methods to Norwegian coastal fishing vessels that caught Atlantic cod (Gadus morhua) as a part of their catch portfolio in 2019. The data contains nearly 32000 fishing trips by 761 vessels. Gaussian mixture models identify eight latent targeting tactics. Cod contributes significantly to three of the tactics. The Herfindahl–Hirschman Index, a measure of vessel-level diversity of tactics, shows that one quarter of the vessels had a specialized strategy (targeting cod plus at most one additional tactic). While cod is often studied as a single-species fishery, we show that cod-catching vessels can be engaged in relatively pure fisheries during some fishing trips but switch to different, often more mixed targets during other trips. We term this as “sequential mixed fisheries”. This is both a challenge and an opportunity for the fisheries management. Article in Journal/Newspaper atlantic cod Gadus morhua Oxford University Press (via Crossref) ICES Journal of Marine Science 79 10 2709 2727 |
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Open Polar |
collection |
Oxford University Press (via Crossref) |
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croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
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Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Liu, Xiaozi Hansen, Cecilie Nedreaas, Kjell Stockhausen, Hans Hagen Heino, Mikko Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Fishermen make repeated choices with respect to when, where, and how to catch their target species. While these targeting tactics—and the factors shaping them—are known to fishers and some experts, knowledge about them is largely informal and not well utilized for management purposes. To formalize information on targeting tactics, we propose a set of methods combining model-based classification of target species with generalized linear models. We apply these methods to Norwegian coastal fishing vessels that caught Atlantic cod (Gadus morhua) as a part of their catch portfolio in 2019. The data contains nearly 32000 fishing trips by 761 vessels. Gaussian mixture models identify eight latent targeting tactics. Cod contributes significantly to three of the tactics. The Herfindahl–Hirschman Index, a measure of vessel-level diversity of tactics, shows that one quarter of the vessels had a specialized strategy (targeting cod plus at most one additional tactic). While cod is often studied as a single-species fishery, we show that cod-catching vessels can be engaged in relatively pure fisheries during some fishing trips but switch to different, often more mixed targets during other trips. We term this as “sequential mixed fisheries”. This is both a challenge and an opportunity for the fisheries management. |
author2 |
Woods, Pamela Research Council of Norway |
format |
Article in Journal/Newspaper |
author |
Liu, Xiaozi Hansen, Cecilie Nedreaas, Kjell Stockhausen, Hans Hagen Heino, Mikko |
author_facet |
Liu, Xiaozi Hansen, Cecilie Nedreaas, Kjell Stockhausen, Hans Hagen Heino, Mikko |
author_sort |
Liu, Xiaozi |
title |
Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
title_short |
Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
title_full |
Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
title_fullStr |
Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
title_full_unstemmed |
Gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
title_sort |
gaussian mixture models reveal highly diverse targeting tactics in a coastal fishing fleet |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/icesjms/fsac207 https://academic.oup.com/icesjms/article-pdf/79/10/2709/47857067/fsac207.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
ICES Journal of Marine Science volume 79, issue 10, page 2709-2727 ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1093/icesjms/fsac207 |
container_title |
ICES Journal of Marine Science |
container_volume |
79 |
container_issue |
10 |
container_start_page |
2709 |
op_container_end_page |
2727 |
_version_ |
1766358042770669568 |