Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)

The recent failure of sardine catches off Galicia (NW Spain), an area where landings reached up to 100 thousand tonnes only a few years ago, may be explained by two possible hypotheses. The "depletion" hypothesis states that diminishing sardine catches were due to a decrease in stock bioma...

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Detalles Bibliográficos
Autores: Carrera, Pablo, Porteiro-Lago, Carmen
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2003
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/327987
Acceso en línea:http://hdl.handle.net/10261/327987
Access Level:acceso abierto
Palabra clave:Pesquerías
Centro Oceanográfico de Vigo
Sardine
Stock variability
Recruitment
Iberian Peninsula
Metapopulation
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spelling Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)Carrera, PabloPorteiro-Lago, CarmenPesqueríasCentro Oceanográfico de VigoSardineStock variabilityRecruitmentIberian PeninsulaMetapopulationThe recent failure of sardine catches off Galicia (NW Spain), an area where landings reached up to 100 thousand tonnes only a few years ago, may be explained by two possible hypotheses. The "depletion" hypothesis states that diminishing sardine catches were due to a decrease in stock biomass resulting from a combination of reduced recruitment and increased fishing mortality. The "change in distribution" hypothesis states that catch failure was due to a change in the distribution of the stock owing to environmental changes. Available information, based on direct observations from acoustic and ichthyplankton surveys and the fishery, was analysed. When the stock size is high, the spawning area of the sardine extends offshore in the Cantabrian Sea, and spreads along the continental shelf off northern Portugal. Moreover, adult fish undertake feeding migration towards Galician waters. This spawning behaviour results in a recruitment located mainly off Portugal. Low stock size causes a shrinkage in the distribution area throughout coastal waters and in the Cantabrian Sea, reaching the inner part of the Bay of Biscay. This process also affects the migration range and favours a higher retention in coastal waters of the early life stages (from eggs to recruits), which remain primarily in the same area where they were hatched. The lack of sardine in Galicia may be explained by a depletion process which affects both the feeding migration of adult fish and the recruitment occurrence off southern Galicia. This paper also analyses the dynamics of this stock in the context of a metapopulation. Taking this concept into consideration, we also examined the influence of the dynamics of each sub-population and the environmental conditions that might affect the success of the recruitment.SI202320232003info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/327987reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigoinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3279872026-05-22T06:33:51Z
dc.title.none.fl_str_mv Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
title Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
spellingShingle Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
Carrera, Pablo
Pesquerías
Centro Oceanográfico de Vigo
Sardine
Stock variability
Recruitment
Iberian Peninsula
Metapopulation
title_short Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
title_full Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
title_fullStr Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
title_full_unstemmed Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
title_sort Stock dynamic of the Iberian sardine (Sardina pilchardus Walb.) and its implication on the fishery off Galicia (NW Spain)
dc.creator.none.fl_str_mv Carrera, Pablo
Porteiro-Lago, Carmen
author Carrera, Pablo
author_facet Carrera, Pablo
Porteiro-Lago, Carmen
author_role author
author2 Porteiro-Lago, Carmen
author2_role author
dc.subject.none.fl_str_mv Pesquerías
Centro Oceanográfico de Vigo
Sardine
Stock variability
Recruitment
Iberian Peninsula
Metapopulation
topic Pesquerías
Centro Oceanográfico de Vigo
Sardine
Stock variability
Recruitment
Iberian Peninsula
Metapopulation
description The recent failure of sardine catches off Galicia (NW Spain), an area where landings reached up to 100 thousand tonnes only a few years ago, may be explained by two possible hypotheses. The "depletion" hypothesis states that diminishing sardine catches were due to a decrease in stock biomass resulting from a combination of reduced recruitment and increased fishing mortality. The "change in distribution" hypothesis states that catch failure was due to a change in the distribution of the stock owing to environmental changes. Available information, based on direct observations from acoustic and ichthyplankton surveys and the fishery, was analysed. When the stock size is high, the spawning area of the sardine extends offshore in the Cantabrian Sea, and spreads along the continental shelf off northern Portugal. Moreover, adult fish undertake feeding migration towards Galician waters. This spawning behaviour results in a recruitment located mainly off Portugal. Low stock size causes a shrinkage in the distribution area throughout coastal waters and in the Cantabrian Sea, reaching the inner part of the Bay of Biscay. This process also affects the migration range and favours a higher retention in coastal waters of the early life stages (from eggs to recruits), which remain primarily in the same area where they were hatched. The lack of sardine in Galicia may be explained by a depletion process which affects both the feeding migration of adult fish and the recruitment occurrence off southern Galicia. This paper also analyses the dynamics of this stock in the context of a metapopulation. Taking this concept into consideration, we also examined the influence of the dynamics of each sub-population and the environmental conditions that might affect the success of the recruitment.
publishDate 2003
dc.date.none.fl_str_mv 2003
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/327987
url http://hdl.handle.net/10261/327987
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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