The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod
Abstract Kvamme, C., and Bogstad, B. 2007. The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod. – ICES Journal of Marine Science, 64: 357–368. For northeast Arctic cod (Gadus morhua), traditional age-based estimates of yield per recruit (YPR) are compared...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsl027 http://academic.oup.com/icesjms/article-pdf/64/2/357/29126804/fsl027.pdf |
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croxfordunivpr:10.1093/icesjms/fsl027 2024-02-11T09:59:51+01:00 The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod Kvamme, Cecilie Bogstad, Bjarte 2007 http://dx.doi.org/10.1093/icesjms/fsl027 http://academic.oup.com/icesjms/article-pdf/64/2/357/29126804/fsl027.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 64, issue 2, page 357-368 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2007 croxfordunivpr https://doi.org/10.1093/icesjms/fsl027 2024-01-12T09:43:24Z Abstract Kvamme, C., and Bogstad, B. 2007. The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod. – ICES Journal of Marine Science, 64: 357–368. For northeast Arctic cod (Gadus morhua), traditional age-based estimates of yield per recruit (YPR) are compared with alternative, though comparable, YPR estimates calculated using an age–length-structured model. In the age–length-structured model, growth, fishing mortality, and natural mortality depend only on length, not on age. This model considers possible changes in size-at-age caused by, for example, a length-selective fishery, and therefore, by comparing the different YPR estimates, the importance of considering the stock's length structure can be evaluated. Length- and weight-at-age of stock and catches were influenced by exploitation pattern and pressure. Such changes are not considered in traditional estimates of YPR, for which weight-at-age is fixed and strictly speaking only representative for the current fishery. Consequently, traditional YPR estimates were somewhat higher than the age–length-based estimates for exploiting smaller fish than at present, and the other way round for exploiting larger fish. Both models indicated a gain in YPR for reducing just exploitation pressure (traditional YPR, 13%; alternative model, 20%) or both reducing exploitation pressure and postponing exploitation (traditional YPR, 23–31%; alternative model, 33–48%), compared with the current fishery. Article in Journal/Newspaper Arctic cod Arctic Gadus morhua Northeast Arctic cod Oxford University Press Arctic ICES Journal of Marine Science 64 2 357 368 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Kvamme, Cecilie Bogstad, Bjarte The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Kvamme, C., and Bogstad, B. 2007. The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod. – ICES Journal of Marine Science, 64: 357–368. For northeast Arctic cod (Gadus morhua), traditional age-based estimates of yield per recruit (YPR) are compared with alternative, though comparable, YPR estimates calculated using an age–length-structured model. In the age–length-structured model, growth, fishing mortality, and natural mortality depend only on length, not on age. This model considers possible changes in size-at-age caused by, for example, a length-selective fishery, and therefore, by comparing the different YPR estimates, the importance of considering the stock's length structure can be evaluated. Length- and weight-at-age of stock and catches were influenced by exploitation pattern and pressure. Such changes are not considered in traditional estimates of YPR, for which weight-at-age is fixed and strictly speaking only representative for the current fishery. Consequently, traditional YPR estimates were somewhat higher than the age–length-based estimates for exploiting smaller fish than at present, and the other way round for exploiting larger fish. Both models indicated a gain in YPR for reducing just exploitation pressure (traditional YPR, 13%; alternative model, 20%) or both reducing exploitation pressure and postponing exploitation (traditional YPR, 23–31%; alternative model, 33–48%), compared with the current fishery. |
format |
Article in Journal/Newspaper |
author |
Kvamme, Cecilie Bogstad, Bjarte |
author_facet |
Kvamme, Cecilie Bogstad, Bjarte |
author_sort |
Kvamme, Cecilie |
title |
The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
title_short |
The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
title_full |
The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
title_fullStr |
The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
title_full_unstemmed |
The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
title_sort |
effect of including length structure in yield-per-recruit estimates for northeast arctic cod |
publisher |
Oxford University Press (OUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1093/icesjms/fsl027 http://academic.oup.com/icesjms/article-pdf/64/2/357/29126804/fsl027.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
op_source |
ICES Journal of Marine Science volume 64, issue 2, page 357-368 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsl027 |
container_title |
ICES Journal of Marine Science |
container_volume |
64 |
container_issue |
2 |
container_start_page |
357 |
op_container_end_page |
368 |
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1790595588690018304 |