External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)

This document provides a review of the bigeye stock assessment conducted by ICCAT in 2018. The work done for this assessment is of high quality, both in terms of data aspects as well as methods for assessment and provision of management advice. Very considerable efforts appear to have been made over...

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Detalles Bibliográficos
Autor: Fernández-Llana, Carmen
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/328386
Acceso en línea:http://hdl.handle.net/10261/328386
Access Level:acceso abierto
Palabra clave:Bigeye tuna (BET)
Pesquerías
Centro Oceanográfico de Vigo
Thunnus obesus
Atlantic
Stock assessment
Review
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spelling External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)Fernández-Llana, CarmenBigeye tuna (BET)PesqueríasCentro Oceanográfico de VigoThunnus obesusAtlanticStock assessmentReviewThis document provides a review of the bigeye stock assessment conducted by ICCAT in 2018. The work done for this assessment is of high quality, both in terms of data aspects as well as methods for assessment and provision of management advice. Very considerable efforts appear to have been made over the years to improve the quality of the data available for the stock assessment; this is very important given the high complexity of the fisheries. Surplus production models and the age-structured SS3 model (fitted to length but no age data) were implemented. Of these, the SS3 implementation is considered to be the most suitable for the assessment of this stock and to provide management advice, mostly because of the very different selectivities of some of the main fleets which has led to changes in the overall selectivity for the total fishery on the stock over time. All methods applied reached the conclusion that there is presently a high probability of B<Bmsy and F>Fmsy, corresponding to the red quadrant of the Kobe plot. Efforts to continue to develop and improve the longline CPUE index used in the stock assessment are strongly encouraged, as is the development of an abundance index for juvenile bigeye tuna. Future work considering ways to more fully incorporate all relevant sources of uncertainty in the projections and evaluating harvest strategies taking due account of uncertainty via MSE is of high relevance and seems to be planned already.202320232018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/328386reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigoinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3283862026-05-22T06:33:51Z
dc.title.none.fl_str_mv External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
title External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
spellingShingle External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
Fernández-Llana, Carmen
Bigeye tuna (BET)
Pesquerías
Centro Oceanográfico de Vigo
Thunnus obesus
Atlantic
Stock assessment
Review
title_short External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
title_full External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
title_fullStr External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
title_full_unstemmed External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
title_sort External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
dc.creator.none.fl_str_mv Fernández-Llana, Carmen
author Fernández-Llana, Carmen
author_facet Fernández-Llana, Carmen
author_role author
dc.subject.none.fl_str_mv Bigeye tuna (BET)
Pesquerías
Centro Oceanográfico de Vigo
Thunnus obesus
Atlantic
Stock assessment
Review
topic Bigeye tuna (BET)
Pesquerías
Centro Oceanográfico de Vigo
Thunnus obesus
Atlantic
Stock assessment
Review
description This document provides a review of the bigeye stock assessment conducted by ICCAT in 2018. The work done for this assessment is of high quality, both in terms of data aspects as well as methods for assessment and provision of management advice. Very considerable efforts appear to have been made over the years to improve the quality of the data available for the stock assessment; this is very important given the high complexity of the fisheries. Surplus production models and the age-structured SS3 model (fitted to length but no age data) were implemented. Of these, the SS3 implementation is considered to be the most suitable for the assessment of this stock and to provide management advice, mostly because of the very different selectivities of some of the main fleets which has led to changes in the overall selectivity for the total fishery on the stock over time. All methods applied reached the conclusion that there is presently a high probability of B<Bmsy and F>Fmsy, corresponding to the red quadrant of the Kobe plot. Efforts to continue to develop and improve the longline CPUE index used in the stock assessment are strongly encouraged, as is the development of an abundance index for juvenile bigeye tuna. Future work considering ways to more fully incorporate all relevant sources of uncertainty in the projections and evaluating harvest strategies taking due account of uncertainty via MSE is of high relevance and seems to be planned already.
publishDate 2018
dc.date.none.fl_str_mv 2018
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/328386
url http://hdl.handle.net/10261/328386
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Vigo
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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