Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock
The collapse of several northwest Atlantic groundfish stocks, including Georges Bank haddock (Melanogrammus aeglefinus), necessitated new fishing regulations and generated interest in the role of predation on stock productivity. The sharp break between prolonged periods of high (pre-1965) and low (p...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Canadian Science Publishing
1997
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Online Access: | http://dx.doi.org/10.1139/f97-197 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-197 |
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crcansciencepubl:10.1139/f97-197 2023-12-17T10:47:37+01:00 Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock Spencer, Paul D Collie, Jeremy S 1997 http://dx.doi.org/10.1139/f97-197 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-197 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 12, page 2920-2929 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1997 crcansciencepubl https://doi.org/10.1139/f97-197 2023-11-19T13:38:57Z The collapse of several northwest Atlantic groundfish stocks, including Georges Bank haddock (Melanogrammus aeglefinus), necessitated new fishing regulations and generated interest in the role of predation on stock productivity. The sharp break between prolonged periods of high (pre-1965) and low (post-1965) haddock abundance suggests differing levels of stock productivity, consistent with a surplus production model incorporating a nonlinear predation rate (Steele and Henderson's (1984. Science (Washington, D.C.), 224: 985-987) model). This model and a Schaefer (1957. Inter-Am. Trop. Tuna Comm. Bull. 2: 245-285) model without a predation term were fit to haddock data to evaluate various rebuilding strategies with two performance measures: the sums of discounted yield and discounted revenue. Steele and Henderson's model provided plausible parameter estimates for the entire data set (1931-1993) whereas Schaefer's model provided plausible estimates only for years of low productivity (1976-1993). The presence of multiple equilibria in Steele and Henderson's model resulted in minor shifts of F, potentially producing large shifts in projected future biomass. For either model, levels of F that maximize either yield or revenue were lower than the recently adopted target level of F 0.1 = 0.24. Recent low production provides impetus for managers to consider a variety of plausible stock production models, and the uncertainty of production dynamics, in choosing rebuilding strategies. Article in Journal/Newspaper Northwest Atlantic Canadian Science Publishing (via Crossref) Steele ENVELOPE(-60.710,-60.710,-70.980,-70.980) Schaefer ENVELOPE(166.383,166.383,-71.367,-71.367) Canadian Journal of Fisheries and Aquatic Sciences 54 12 2920 2929 |
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 Spencer, Paul D Collie, Jeremy S Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The collapse of several northwest Atlantic groundfish stocks, including Georges Bank haddock (Melanogrammus aeglefinus), necessitated new fishing regulations and generated interest in the role of predation on stock productivity. The sharp break between prolonged periods of high (pre-1965) and low (post-1965) haddock abundance suggests differing levels of stock productivity, consistent with a surplus production model incorporating a nonlinear predation rate (Steele and Henderson's (1984. Science (Washington, D.C.), 224: 985-987) model). This model and a Schaefer (1957. Inter-Am. Trop. Tuna Comm. Bull. 2: 245-285) model without a predation term were fit to haddock data to evaluate various rebuilding strategies with two performance measures: the sums of discounted yield and discounted revenue. Steele and Henderson's model provided plausible parameter estimates for the entire data set (1931-1993) whereas Schaefer's model provided plausible estimates only for years of low productivity (1976-1993). The presence of multiple equilibria in Steele and Henderson's model resulted in minor shifts of F, potentially producing large shifts in projected future biomass. For either model, levels of F that maximize either yield or revenue were lower than the recently adopted target level of F 0.1 = 0.24. Recent low production provides impetus for managers to consider a variety of plausible stock production models, and the uncertainty of production dynamics, in choosing rebuilding strategies. |
format |
Article in Journal/Newspaper |
author |
Spencer, Paul D Collie, Jeremy S |
author_facet |
Spencer, Paul D Collie, Jeremy S |
author_sort |
Spencer, Paul D |
title |
Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock |
title_short |
Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock |
title_full |
Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock |
title_fullStr |
Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock |
title_full_unstemmed |
Effect of nonlinear predation rates on rebuilding the Georges Bank haddock (Melanogrammus aeglefinus) stock |
title_sort |
effect of nonlinear predation rates on rebuilding the georges bank haddock (melanogrammus aeglefinus) stock |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/f97-197 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-197 |
long_lat |
ENVELOPE(-60.710,-60.710,-70.980,-70.980) ENVELOPE(166.383,166.383,-71.367,-71.367) |
geographic |
Steele Schaefer |
geographic_facet |
Steele Schaefer |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 12, page 2920-2929 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f97-197 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
54 |
container_issue |
12 |
container_start_page |
2920 |
op_container_end_page |
2929 |
_version_ |
1785571522212003840 |