Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century
Fishery-dependent data are frequently used to inform management decisions. However, inferences about stock development based on commercial data such as Catch-Per-Unit-Effort (CPUE) can be severely biased due to a phenomenon known as technological creep, where fishing technology improves over time. H...
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Online Access: | https://hdl.handle.net/11250/2985700 https://doi.org/10.1038/s41598-022-07293-2 |
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ftimr:oai:imr.brage.unit.no:11250/2985700 2023-05-15T16:08:49+02:00 Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century Kleiven, Alf Ring Espeland, Sigurd Heiberg Stiansen, Stian Ono, Kotaro Zimmermann, Fabian Olsen, Esben Moland 2022 application/pdf https://hdl.handle.net/11250/2985700 https://doi.org/10.1038/s41598-022-07293-2 eng eng urn:issn:2045-2322 https://hdl.handle.net/11250/2985700 https://doi.org/10.1038/s41598-022-07293-2 cristin:2009023 Scientific Reports Peer reviewed Journal article 2022 ftimr https://doi.org/10.1038/s41598-022-07293-2 2022-03-23T23:39:38Z Fishery-dependent data are frequently used to inform management decisions. However, inferences about stock development based on commercial data such as Catch-Per-Unit-Effort (CPUE) can be severely biased due to a phenomenon known as technological creep, where fishing technology improves over time. Here we show how trap improvement over nine decades has driven technological creep in a European lobster (Homarus gammarus) fishery. We combined fishing data, experimental fishing with contemporary and older trap types, and information on depletion effects during fishing seasons. The resulting standardized CPUE time series indicates a 92% decline in lobster abundance between 1928 and 2019 compared to 70% if technological creep is not corrected for. Differences are most pronounced within the last 40 years when the most substantial shift in gear technology occurred: an uncorrected CPUE index suggests an 8% increase in lobster abundance during this period, while the corrected CPUE index declined by 57%. We conclude that technological creep has masked a continuous stock decline, particularly in recent decades and largely driven by the shift from one- to two-chambered traps, as well as the ability of newer trap designs to capture larger lobsters. Our study confirms the importance of adequate standardization, including technological development, when using fishery dependent CPUE for monitoring and management of data-limited fisheries. publishedVersion Article in Journal/Newspaper European lobster Homarus gammarus Institute for Marine Research: Brage IMR Scientific Reports 12 1 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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English |
description |
Fishery-dependent data are frequently used to inform management decisions. However, inferences about stock development based on commercial data such as Catch-Per-Unit-Effort (CPUE) can be severely biased due to a phenomenon known as technological creep, where fishing technology improves over time. Here we show how trap improvement over nine decades has driven technological creep in a European lobster (Homarus gammarus) fishery. We combined fishing data, experimental fishing with contemporary and older trap types, and information on depletion effects during fishing seasons. The resulting standardized CPUE time series indicates a 92% decline in lobster abundance between 1928 and 2019 compared to 70% if technological creep is not corrected for. Differences are most pronounced within the last 40 years when the most substantial shift in gear technology occurred: an uncorrected CPUE index suggests an 8% increase in lobster abundance during this period, while the corrected CPUE index declined by 57%. We conclude that technological creep has masked a continuous stock decline, particularly in recent decades and largely driven by the shift from one- to two-chambered traps, as well as the ability of newer trap designs to capture larger lobsters. Our study confirms the importance of adequate standardization, including technological development, when using fishery dependent CPUE for monitoring and management of data-limited fisheries. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kleiven, Alf Ring Espeland, Sigurd Heiberg Stiansen, Stian Ono, Kotaro Zimmermann, Fabian Olsen, Esben Moland |
spellingShingle |
Kleiven, Alf Ring Espeland, Sigurd Heiberg Stiansen, Stian Ono, Kotaro Zimmermann, Fabian Olsen, Esben Moland Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century |
author_facet |
Kleiven, Alf Ring Espeland, Sigurd Heiberg Stiansen, Stian Ono, Kotaro Zimmermann, Fabian Olsen, Esben Moland |
author_sort |
Kleiven, Alf Ring |
title |
Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century |
title_short |
Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century |
title_full |
Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century |
title_fullStr |
Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century |
title_full_unstemmed |
Technological creep masks continued decline in a lobster (Homarus gammarus) fishery over a century |
title_sort |
technological creep masks continued decline in a lobster (homarus gammarus) fishery over a century |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/2985700 https://doi.org/10.1038/s41598-022-07293-2 |
genre |
European lobster Homarus gammarus |
genre_facet |
European lobster Homarus gammarus |
op_source |
Scientific Reports |
op_relation |
urn:issn:2045-2322 https://hdl.handle.net/11250/2985700 https://doi.org/10.1038/s41598-022-07293-2 cristin:2009023 |
op_doi |
https://doi.org/10.1038/s41598-022-07293-2 |
container_title |
Scientific Reports |
container_volume |
12 |
container_issue |
1 |
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1766404829398171648 |