Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring
The population dynamics of a stock of spring-spawning herring in Fortune Bay, Newfoundland, are described in relation to exploitation patterns, management strategies, and environmental variability. Biomass levels increased substantially during the late 1960's as a result of the recruitment of s...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/f85-280 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-280 |
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crcansciencepubl:10.1139/f85-280 2023-12-17T10:45:00+01:00 Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring Winters, G. H. Dalley, E. L. Moores, J. A. 1985 http://dx.doi.org/10.1139/f85-280 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-280 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue S1, page s263-s274 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1985 crcansciencepubl https://doi.org/10.1139/f85-280 2023-11-19T13:39:39Z The population dynamics of a stock of spring-spawning herring in Fortune Bay, Newfoundland, are described in relation to exploitation patterns, management strategies, and environmental variability. Biomass levels increased substantially during the late 1960's as a result of the recruitment of several strong year-classes that were pulse-fished by a purse-seine fishery. The resulting high fishing mortality rates caused a rapid stock decline in the early 1970's that was associated with an increase in the partial recruitment rate of the younger age-groups as well as an increase in the catchability coefficient of the purse-seine fleet. The combination of these classical changes resulted in a substantial overestimation of stock abundance and recruitment levels that was not corrected until an alternative series of catch rates and partial recruitment estimators were used to fine-tune population assessment. Environmental factors, rather than spawning stock size, were shown to explain a significant fraction of recruitment variability. Alternative fishing strategies such as the F 0.1 and surplus production concepts were simulated and shown to be less efficient in extracting biomass yield than pulse-fishing. It is concluded, therefore, that management regimes whose objectives are promulgated on the basis of stock rebuilding, stock stability, and enhanced recruitment through protection of the spawning stock are unlikely to succeed (except fortuitously) for herring populations such as those in Fortune Bay due to the dominant controlling influence of environmental variability. For such herring stocks the most appropriate long-term management strategy that could be supported on biological grounds would be a minimum size limit established at or above the length of 50% maturity. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 42 S1 s263 s274 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Winters, G. H. Dalley, E. L. Moores, J. A. Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The population dynamics of a stock of spring-spawning herring in Fortune Bay, Newfoundland, are described in relation to exploitation patterns, management strategies, and environmental variability. Biomass levels increased substantially during the late 1960's as a result of the recruitment of several strong year-classes that were pulse-fished by a purse-seine fishery. The resulting high fishing mortality rates caused a rapid stock decline in the early 1970's that was associated with an increase in the partial recruitment rate of the younger age-groups as well as an increase in the catchability coefficient of the purse-seine fleet. The combination of these classical changes resulted in a substantial overestimation of stock abundance and recruitment levels that was not corrected until an alternative series of catch rates and partial recruitment estimators were used to fine-tune population assessment. Environmental factors, rather than spawning stock size, were shown to explain a significant fraction of recruitment variability. Alternative fishing strategies such as the F 0.1 and surplus production concepts were simulated and shown to be less efficient in extracting biomass yield than pulse-fishing. It is concluded, therefore, that management regimes whose objectives are promulgated on the basis of stock rebuilding, stock stability, and enhanced recruitment through protection of the spawning stock are unlikely to succeed (except fortuitously) for herring populations such as those in Fortune Bay due to the dominant controlling influence of environmental variability. For such herring stocks the most appropriate long-term management strategy that could be supported on biological grounds would be a minimum size limit established at or above the length of 50% maturity. |
format |
Article in Journal/Newspaper |
author |
Winters, G. H. Dalley, E. L. Moores, J. A. |
author_facet |
Winters, G. H. Dalley, E. L. Moores, J. A. |
author_sort |
Winters, G. H. |
title |
Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring |
title_short |
Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring |
title_full |
Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring |
title_fullStr |
Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring |
title_full_unstemmed |
Fortuity Disguised as Fisheries Management: The Case History of Fortune Bay Herring |
title_sort |
fortuity disguised as fisheries management: the case history of fortune bay herring |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/f85-280 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-280 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue S1, page s263-s274 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f85-280 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
42 |
container_issue |
S1 |
container_start_page |
s263 |
op_container_end_page |
s274 |
_version_ |
1785564680553496576 |