Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0.
Simple constant (intended) proportion CMPs are applied to the 16 conditioned Operating Models (OMs) in version 3.3.0 of the Package. Ranges of the two control parameters for west and east proportions are selected to give reasonable trade-offs between catch and stock recovery (where needed). For near...
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2021
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ftdatacite:10.25375/uct.14191475 2023-05-15T17:33:22+02:00 Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. Butterworth, Doug Miyagawa, Mitsuyo Jacobs, Melissa 2021 https://dx.doi.org/10.25375/uct.14191475 https://zivahub.uct.ac.za/articles/report/Further_investigations_of_simple_fixed_proportion_candidate_management_procedures_for_North_Atlantic_Bluefin_tuna_using_operating_model_package_version_3_3_0_/14191475 unknown University of Cape Town Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 10401 Applied Statistics FOS Mathematics 10402 Biostatistics 10202 Biological Mathematics Other Report report 2021 ftdatacite https://doi.org/10.25375/uct.14191475 2021-11-05T12:55:41Z Simple constant (intended) proportion CMPs are applied to the 16 conditioned Operating Models (OMs) in version 3.3.0 of the Package. Ranges of the two control parameters for west and east proportions are selected to give reasonable trade-offs between catch and stock recovery (where needed). For nearly all of the OMs this is readily achieved. However, problems arise for some of the abundance factor B OMs (with lower west stock abundances matching those in the most recent assessment) coupled to an unchanging Beverton-Holt stock-recruitment function for the west stock (recruitment factor 2). For one of these scenarios, even with no catch from the west area, an already depleted west stock declines under catches in the east that are well below present levels, because sufficient bluefin of western origin migrate to the east area and can be harvested there. The key immediate question then becomes whether such OM scenarios are sufficiently plausible that they need to be taken into account when seeking an MP which evidences robustness over a range of reasonably plausible levels of uncertainty. Report North Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
10401 Applied Statistics FOS Mathematics 10402 Biostatistics 10202 Biological Mathematics |
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10401 Applied Statistics FOS Mathematics 10402 Biostatistics 10202 Biological Mathematics Butterworth, Doug Miyagawa, Mitsuyo Jacobs, Melissa Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. |
topic_facet |
10401 Applied Statistics FOS Mathematics 10402 Biostatistics 10202 Biological Mathematics |
description |
Simple constant (intended) proportion CMPs are applied to the 16 conditioned Operating Models (OMs) in version 3.3.0 of the Package. Ranges of the two control parameters for west and east proportions are selected to give reasonable trade-offs between catch and stock recovery (where needed). For nearly all of the OMs this is readily achieved. However, problems arise for some of the abundance factor B OMs (with lower west stock abundances matching those in the most recent assessment) coupled to an unchanging Beverton-Holt stock-recruitment function for the west stock (recruitment factor 2). For one of these scenarios, even with no catch from the west area, an already depleted west stock declines under catches in the east that are well below present levels, because sufficient bluefin of western origin migrate to the east area and can be harvested there. The key immediate question then becomes whether such OM scenarios are sufficiently plausible that they need to be taken into account when seeking an MP which evidences robustness over a range of reasonably plausible levels of uncertainty. |
format |
Report |
author |
Butterworth, Doug Miyagawa, Mitsuyo Jacobs, Melissa |
author_facet |
Butterworth, Doug Miyagawa, Mitsuyo Jacobs, Melissa |
author_sort |
Butterworth, Doug |
title |
Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. |
title_short |
Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. |
title_full |
Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. |
title_fullStr |
Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. |
title_full_unstemmed |
Further investigations of simple “fixed proportion” candidate management procedures for North Atlantic Bluefin tuna using operating model package version 3.3.0. |
title_sort |
further investigations of simple “fixed proportion” candidate management procedures for north atlantic bluefin tuna using operating model package version 3.3.0. |
publisher |
University of Cape Town |
publishDate |
2021 |
url |
https://dx.doi.org/10.25375/uct.14191475 https://zivahub.uct.ac.za/articles/report/Further_investigations_of_simple_fixed_proportion_candidate_management_procedures_for_North_Atlantic_Bluefin_tuna_using_operating_model_package_version_3_3_0_/14191475 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25375/uct.14191475 |
_version_ |
1766131838749769728 |