Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks
Abstract Variation in maturity-at-age, sex ratio, and potential egg production (through changes in length at age) were examined for northern cod (NAFO Division 2J + 3KL), southern Grand Bank cod (3NO), and southern Newfoundland cod (3Ps). All showed significant interannual variability in each stock....
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2005
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Online Access: | http://dx.doi.org/10.1016/j.icesjms.2004.10.003 http://academic.oup.com/icesjms/article-pdf/62/1/65/29150194/62-1-65.pdf |
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croxfordunivpr:10.1016/j.icesjms.2004.10.003 2024-05-12T08:00:57+00:00 Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks Morgan, M. Joanne Brattey, John 2005 http://dx.doi.org/10.1016/j.icesjms.2004.10.003 http://academic.oup.com/icesjms/article-pdf/62/1/65/29150194/62-1-65.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 62, issue 1, page 65-74 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2005 croxfordunivpr https://doi.org/10.1016/j.icesjms.2004.10.003 2024-04-18T08:18:38Z Abstract Variation in maturity-at-age, sex ratio, and potential egg production (through changes in length at age) were examined for northern cod (NAFO Division 2J + 3KL), southern Grand Bank cod (3NO), and southern Newfoundland cod (3Ps). All showed significant interannual variability in each stock. Estimates of reproductive potential were produced by sequentially incorporating estimates of proportion mature at age, sex ratio at age, and potential egg production. The estimates of reproductive potential produced by each method were broadly similar, but there were important differences. This leads to differing perceptions of stock productivity, as measured by relative rate of recruitment of a stock and in the spawning stock produced per recruit. These differing perceptions can have a major impact on expectations for the recovery of depleted stocks and the sustainability of various levels of fishing. Efforts should be made to improve estimates of reproductive potential by further exploring the impacts of changes in the spawning characteristics of populations, and by collecting such basic information as fecundity data. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Northwest Atlantic Oxford University Press ICES Journal of Marine Science 62 1 65 74 |
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 Morgan, M. Joanne Brattey, John Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Variation in maturity-at-age, sex ratio, and potential egg production (through changes in length at age) were examined for northern cod (NAFO Division 2J + 3KL), southern Grand Bank cod (3NO), and southern Newfoundland cod (3Ps). All showed significant interannual variability in each stock. Estimates of reproductive potential were produced by sequentially incorporating estimates of proportion mature at age, sex ratio at age, and potential egg production. The estimates of reproductive potential produced by each method were broadly similar, but there were important differences. This leads to differing perceptions of stock productivity, as measured by relative rate of recruitment of a stock and in the spawning stock produced per recruit. These differing perceptions can have a major impact on expectations for the recovery of depleted stocks and the sustainability of various levels of fishing. Efforts should be made to improve estimates of reproductive potential by further exploring the impacts of changes in the spawning characteristics of populations, and by collecting such basic information as fecundity data. |
format |
Article in Journal/Newspaper |
author |
Morgan, M. Joanne Brattey, John |
author_facet |
Morgan, M. Joanne Brattey, John |
author_sort |
Morgan, M. Joanne |
title |
Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks |
title_short |
Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks |
title_full |
Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks |
title_fullStr |
Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks |
title_full_unstemmed |
Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks |
title_sort |
effect of changes in reproductive potential on perceived productivity of three northwest atlantic cod (gadus morhua) stocks |
publisher |
Oxford University Press (OUP) |
publishDate |
2005 |
url |
http://dx.doi.org/10.1016/j.icesjms.2004.10.003 http://academic.oup.com/icesjms/article-pdf/62/1/65/29150194/62-1-65.pdf |
genre |
atlantic cod Gadus morhua Newfoundland Northwest Atlantic |
genre_facet |
atlantic cod Gadus morhua Newfoundland Northwest Atlantic |
op_source |
ICES Journal of Marine Science volume 62, issue 1, page 65-74 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2004.10.003 |
container_title |
ICES Journal of Marine Science |
container_volume |
62 |
container_issue |
1 |
container_start_page |
65 |
op_container_end_page |
74 |
_version_ |
1798843004799156224 |