Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)

Three Yield-Per-Recruit/stock-recruitment approaches (deterministic, stochastic with plotMSY and stochastic with HCS) were used to explore reference points for the management of the Iberian sardine. The sensitivity of reference points was evaluated in relation to alternative scenarios of productivit...

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Autores: Silva, Alexandra, Uriarte, Andrés, Riveiro, Isabel, Santos, María Begoña, Azevedo, Manuela, Murta, Alberto, Carrera, Pablo, Ibaibarriaga, Leire, Skagen, Dankert
Tipo de recurso: otro
Fecha de publicación:2013
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/327629
Acceso en línea:http://hdl.handle.net/10261/327629
Access Level:acceso abierto
Palabra clave:Centro Oceanográfico de Vigo
Pesquerías
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repository_id_str
spelling Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)Silva, AlexandraUriarte, AndrésRiveiro, IsabelSantos, María BegoñaAzevedo, ManuelaMurta, AlbertoCarrera, PabloIbaibarriaga, LeireSkagen, DankertCentro Oceanográfico de VigoPesqueríasThree Yield-Per-Recruit/stock-recruitment approaches (deterministic, stochastic with plotMSY and stochastic with HCS) were used to explore reference points for the management of the Iberian sardine. The sensitivity of reference points was evaluated in relation to alternative scenarios of productivity, growth and selectivity. Growth and selectivity scenarios had a small impact on stock projections whereas productivity scenarios were very influential. The three approaches gave coherent results, but the approach using HCS, assuming uncertainty in stock biology and recruitment dynamics, was preferred to derive reference points for sardine. In this approach, the risks of the stock fa lling below some low biomass level can also be taken into account. This possibility was considered to be useful in the case of the sardine for which exploitation at maximum YPR or F0.1 resulted in values above historical exploitation and higher than Floss, therefore unsuitable as precautionary management targets. Bloss (306 thousand t) is proposed as a proxy for Blim but given no indication that recruitment is impaired below this biomass level, the group considers that the level of risk of falling below this candidate for Blim acceptable in the evaluation of a management plan should be higher than the standard ICES value (5%).The stock productivity has declined over time; therefore a scenario of low productivity was assumed (recruitment in the period 1993-2010). Under this productivity scenario, the Fmsy value for the sardine stock is 0.34, a value associated with a high probability (45%) of the biomass falling below the proposed Blim and therefore, incompatible with precautionary considerations. The WG proposes an F= 0.27, corresponding to a Prob(B<Blim)<15% under equilibrium, as the best available candidate for an F management target (proxy for Fmsy) assuming the low productivity scenario (since 1993) will continue in the future. This F provides high yield conditional to a low probability that the biomass falls below Blim=Bloss in equilibrium, thus incorporating precautionary considerations.202320232013info:eu-repo/semantics/otherhttp://purl.org/coar/resource_type/c_18ghinfo:eu-repo/semantics/reporthttp://hdl.handle.net/10261/327629reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigoinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3276292026-05-22T06:33:51Z
dc.title.none.fl_str_mv Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
title Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
spellingShingle Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
Silva, Alexandra
Centro Oceanográfico de Vigo
Pesquerías
title_short Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
title_full Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
title_fullStr Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
title_full_unstemmed Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
title_sort Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
dc.creator.none.fl_str_mv Silva, Alexandra
Uriarte, Andrés
Riveiro, Isabel
Santos, María Begoña
Azevedo, Manuela
Murta, Alberto
Carrera, Pablo
Ibaibarriaga, Leire
Skagen, Dankert
author Silva, Alexandra
author_facet Silva, Alexandra
Uriarte, Andrés
Riveiro, Isabel
Santos, María Begoña
Azevedo, Manuela
Murta, Alberto
Carrera, Pablo
Ibaibarriaga, Leire
Skagen, Dankert
author_role author
author2 Uriarte, Andrés
Riveiro, Isabel
Santos, María Begoña
Azevedo, Manuela
Murta, Alberto
Carrera, Pablo
Ibaibarriaga, Leire
Skagen, Dankert
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Centro Oceanográfico de Vigo
Pesquerías
topic Centro Oceanográfico de Vigo
Pesquerías
description Three Yield-Per-Recruit/stock-recruitment approaches (deterministic, stochastic with plotMSY and stochastic with HCS) were used to explore reference points for the management of the Iberian sardine. The sensitivity of reference points was evaluated in relation to alternative scenarios of productivity, growth and selectivity. Growth and selectivity scenarios had a small impact on stock projections whereas productivity scenarios were very influential. The three approaches gave coherent results, but the approach using HCS, assuming uncertainty in stock biology and recruitment dynamics, was preferred to derive reference points for sardine. In this approach, the risks of the stock fa lling below some low biomass level can also be taken into account. This possibility was considered to be useful in the case of the sardine for which exploitation at maximum YPR or F0.1 resulted in values above historical exploitation and higher than Floss, therefore unsuitable as precautionary management targets. Bloss (306 thousand t) is proposed as a proxy for Blim but given no indication that recruitment is impaired below this biomass level, the group considers that the level of risk of falling below this candidate for Blim acceptable in the evaluation of a management plan should be higher than the standard ICES value (5%).The stock productivity has declined over time; therefore a scenario of low productivity was assumed (recruitment in the period 1993-2010). Under this productivity scenario, the Fmsy value for the sardine stock is 0.34, a value associated with a high probability (45%) of the biomass falling below the proposed Blim and therefore, incompatible with precautionary considerations. The WG proposes an F= 0.27, corresponding to a Prob(B<Blim)<15% under equilibrium, as the best available candidate for an F management target (proxy for Fmsy) assuming the low productivity scenario (since 1993) will continue in the future. This F provides high yield conditional to a low probability that the biomass falls below Blim=Bloss in equilibrium, thus incorporating precautionary considerations.
publishDate 2013
dc.date.none.fl_str_mv 2013
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/other
http://purl.org/coar/resource_type/c_18gh
dc.type.openaire.fl_str_mv info:eu-repo/semantics/report
format other
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/327629
url http://hdl.handle.net/10261/327629
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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