The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod
<qd> 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. </qd>For northeast Arctic cod ( Gadus morhua ), traditional age-based estimates of yield per recruit (YP...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
2007
|
Subjects: | |
Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/64/2/357 https://doi.org/10.1093/icesjms/fsl027 |
id |
fthighwire:oai:open-archive.highwire.org:icesjms:64/2/357 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:icesjms:64/2/357 2023-05-15T14:30:22+02:00 The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod Kvamme, Cecilie Bogstad, Bjarte 2007-03-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/64/2/357 https://doi.org/10.1093/icesjms/fsl027 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/64/2/357 http://dx.doi.org/10.1093/icesjms/fsl027 Copyright (C) 2007, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Articles TEXT 2007 fthighwire https://doi.org/10.1093/icesjms/fsl027 2007-06-24T01:03:12Z <qd> 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. </qd>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. Text Arctic cod Arctic Gadus morhua Northeast Arctic cod HighWire Press (Stanford University) Arctic ICES Journal of Marine Science 64 2 357 368 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Articles |
spellingShingle |
Articles Kvamme, Cecilie Bogstad, Bjarte The effect of including length structure in yield-per-recruit estimates for northeast Arctic cod |
topic_facet |
Articles |
description |
<qd> 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. </qd>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 |
Text |
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 |
publishDate |
2007 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/64/2/357 https://doi.org/10.1093/icesjms/fsl027 |
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_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/64/2/357 http://dx.doi.org/10.1093/icesjms/fsl027 |
op_rights |
Copyright (C) 2007, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
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 |
_version_ |
1766304219594227712 |