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dc.contributor.authorKleiven, Alf Ring
dc.contributor.authorEspeland, Sigurd Heiberg
dc.contributor.authorStiansen, Stian
dc.contributor.authorOno, Kotaro
dc.contributor.authorZimmermann, Fabian
dc.contributor.authorOlsen, Esben Moland
dc.date.accessioned2022-03-17T07:55:35Z
dc.date.available2022-03-17T07:55:35Z
dc.date.created2022-03-11T09:54:20Z
dc.date.issued2022
dc.identifier.issn2045-2322
dc.identifier.urihttps://hdl.handle.net/11250/2985700
dc.description.abstractFishery-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.en_US
dc.language.isoengen_US
dc.titleTechnological creep masks continued decline in a lobster (Homarus gammarus) fishery over a centuryen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.journalScientific Reportsen_US
dc.identifier.doi10.1038/s41598-022-07293-2
dc.identifier.cristin2009023
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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