Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock
Abstract ICES assessments of cod (Gadus morhua) in the west of Scotland (ICES Division 6a) suggest the biomass has collapsed and that fishing mortality rate (F) has remained high. In contrast, other stocks in the same fishery, and adjacent cod stocks all show marked declines in fishing mortality and...
Published in: | ICES Journal of Marine Science |
---|---|
Main Author: | |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/icesjms/fsy190 http://academic.oup.com/icesjms/article-pdf/76/4/787/31239317/fsy190.pdf |
id |
croxfordunivpr:10.1093/icesjms/fsy190 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/icesjms/fsy190 2023-10-01T03:56:04+02:00 Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock Cook, R M Zhou, Shijie MASTS through the Scottish Funding Council 2019 http://dx.doi.org/10.1093/icesjms/fsy190 http://academic.oup.com/icesjms/article-pdf/76/4/787/31239317/fsy190.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 76, issue 4, page 787-793 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2019 croxfordunivpr https://doi.org/10.1093/icesjms/fsy190 2023-09-08T10:48:05Z Abstract ICES assessments of cod (Gadus morhua) in the west of Scotland (ICES Division 6a) suggest the biomass has collapsed and that fishing mortality rate (F) has remained high. In contrast, other stocks in the same fishery, and adjacent cod stocks all show marked declines in fishing mortality and some recovery of the biomass. The perception of the status of 6a cod appears to be dependent on the assumption that the fishery exploitation pattern is flat topped. An assessment that allows the exploitation to take a domed shape produces results that suggest a marked decline in fishing mortality rate and that the spawning stock biomass has recovered to the minimum biomass reference point, Blim. The reduction in F is consistent with substantial reductions in fishing effort and shows a similar pattern to stocks taken within the same fishery. The management implications arising from the two assessments differ substantially. The analysis indicates that benchmark assessments need to test assessment model conditioning assumptions more widely and that management advice needs to consider a more comprehensive range of information about the stock and fishery. Article in Journal/Newspaper Gadus morhua Oxford University Press (via Crossref) ICES Journal of Marine Science 76 4 787 793 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
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 Cook, R M Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract ICES assessments of cod (Gadus morhua) in the west of Scotland (ICES Division 6a) suggest the biomass has collapsed and that fishing mortality rate (F) has remained high. In contrast, other stocks in the same fishery, and adjacent cod stocks all show marked declines in fishing mortality and some recovery of the biomass. The perception of the status of 6a cod appears to be dependent on the assumption that the fishery exploitation pattern is flat topped. An assessment that allows the exploitation to take a domed shape produces results that suggest a marked decline in fishing mortality rate and that the spawning stock biomass has recovered to the minimum biomass reference point, Blim. The reduction in F is consistent with substantial reductions in fishing effort and shows a similar pattern to stocks taken within the same fishery. The management implications arising from the two assessments differ substantially. The analysis indicates that benchmark assessments need to test assessment model conditioning assumptions more widely and that management advice needs to consider a more comprehensive range of information about the stock and fishery. |
author2 |
Zhou, Shijie MASTS through the Scottish Funding Council |
format |
Article in Journal/Newspaper |
author |
Cook, R M |
author_facet |
Cook, R M |
author_sort |
Cook, R M |
title |
Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock |
title_short |
Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock |
title_full |
Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock |
title_fullStr |
Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock |
title_full_unstemmed |
Stock collapse or stock recovery? Contrasting perceptions of a depleted cod stock |
title_sort |
stock collapse or stock recovery? contrasting perceptions of a depleted cod stock |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/icesjms/fsy190 http://academic.oup.com/icesjms/article-pdf/76/4/787/31239317/fsy190.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 76, issue 4, page 787-793 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsy190 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
4 |
container_start_page |
787 |
op_container_end_page |
793 |
_version_ |
1778525179208531968 |