An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna
This document provides an illustrative example of the development of Candidate Management Procedures (MPs) for the Eastern North Atlantic bluefin tuna resource. Its purpose is to draw attention to key components of this process, including the specification of a number of alternative Operating Models...
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International Commission for the Conservation of Atlantic Tunas
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ftunivcapetownir:oai:localhost:11427/24020 2023-05-15T17:30:53+02:00 An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna Rademeyer, Rebecca A Butterworth, Doug S 2016 application/pdf http://hdl.handle.net/11427/24020 https://open.uct.ac.za/bitstream/11427/24020/1/SCRS_2015_167.pdf eng eng International Commission for the Conservation of Atlantic Tunas University of Cape Town Faculty of Science Marine Resource Assessment and Management Group Collective Volume of Scientific Papers http://hdl.handle.net/11427/24020 https://open.uct.ac.za/bitstream/11427/24020/1/SCRS_2015_167.pdf ICCAT Collective Volume of Scientific Papers https://www.iccat.int/en/pubs_CVSP.htm Journal Article 2016 ftunivcapetownir 2022-09-13T05:49:27Z This document provides an illustrative example of the development of Candidate Management Procedures (MPs) for the Eastern North Atlantic bluefin tuna resource. Its purpose is to draw attention to key components of this process, including the specification of a number of alternative Operating Models (OMs) which describe plausible dynamics for the resource, the choices of abundance indices for use for input to MPs and of the error structures associated with the generation of future data corresponding to those indices, and consideration of key performance statistics related to future catch levels and resource conservation to allow consideration of the different trade-offs between these for alternative MPs. The MPs examined use a combination of target and slope based approaches applied to simulated future abundance indices from Japanese longline operations and a larval survey in an area of the western Mediterranean. MP trials are carried out for four OMs which reflect alternative resource assessments and choices for relationships between recruitment and spawning biomass. The greatest challenge appears to come from a scenario with both high and low recruitment regimes when there is a change from the former to the latter. If catches are allowed to go high to benefit from the period of high recruitment, can the change in regime be identified sufficiently soon to allow for adequate catch limit reductions to ensure resource conservation during the later years of lower recruitments? Article in Journal/Newspaper North Atlantic University of Cape Town: OpenUCT |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
description |
This document provides an illustrative example of the development of Candidate Management Procedures (MPs) for the Eastern North Atlantic bluefin tuna resource. Its purpose is to draw attention to key components of this process, including the specification of a number of alternative Operating Models (OMs) which describe plausible dynamics for the resource, the choices of abundance indices for use for input to MPs and of the error structures associated with the generation of future data corresponding to those indices, and consideration of key performance statistics related to future catch levels and resource conservation to allow consideration of the different trade-offs between these for alternative MPs. The MPs examined use a combination of target and slope based approaches applied to simulated future abundance indices from Japanese longline operations and a larval survey in an area of the western Mediterranean. MP trials are carried out for four OMs which reflect alternative resource assessments and choices for relationships between recruitment and spawning biomass. The greatest challenge appears to come from a scenario with both high and low recruitment regimes when there is a change from the former to the latter. If catches are allowed to go high to benefit from the period of high recruitment, can the change in regime be identified sufficiently soon to allow for adequate catch limit reductions to ensure resource conservation during the later years of lower recruitments? |
format |
Article in Journal/Newspaper |
author |
Rademeyer, Rebecca A Butterworth, Doug S |
spellingShingle |
Rademeyer, Rebecca A Butterworth, Doug S An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna |
author_facet |
Rademeyer, Rebecca A Butterworth, Doug S |
author_sort |
Rademeyer, Rebecca A |
title |
An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna |
title_short |
An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna |
title_full |
An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna |
title_fullStr |
An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna |
title_full_unstemmed |
An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna |
title_sort |
illustrative example of a management procedure for eastern north atlantic bluefin tuna |
publisher |
International Commission for the Conservation of Atlantic Tunas |
publishDate |
2016 |
url |
http://hdl.handle.net/11427/24020 https://open.uct.ac.za/bitstream/11427/24020/1/SCRS_2015_167.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ICCAT Collective Volume of Scientific Papers https://www.iccat.int/en/pubs_CVSP.htm |
op_relation |
Collective Volume of Scientific Papers http://hdl.handle.net/11427/24020 https://open.uct.ac.za/bitstream/11427/24020/1/SCRS_2015_167.pdf |
_version_ |
1766128015790571520 |