Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion

This report summarizes fish community trends for the Flemish Cap (NAFO Div. 3M) based on European Union summer trawl research vessel surveys between 1988 and 2018. Species were classified into eight functional groups and trends were described using biomass indices, biomass and abundance anomalies, a...

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Authors: Koen-Alonso, Mariano, Pérez-Rodríguez, Alfonso, Cuff, A., González-Troncoso, Diana, Sacau-Cuadrado, María del Mar
Format: article
Publication Date:2018
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/329388
Online Access:http://hdl.handle.net/10261/329388
Access Level:Open access
Keyword:Centro Oceanográfico de Vigo
Pesquerías
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spelling Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregionKoen-Alonso, MarianoPérez-Rodríguez, AlfonsoCuff, A.González-Troncoso, DianaSacau-Cuadrado, María del MarCentro Oceanográfico de VigoPesqueríasThis report summarizes fish community trends for the Flemish Cap (NAFO Div. 3M) based on European Union summer trawl research vessel surveys between 1988 and 2018. Species were classified into eight functional groups and trends were described using biomass indices, biomass and abundance anomalies, and fish size (Biomass/Abundance Ratio) anomalies. In 2003, a replacement of the research vessel allowed extending the depth coverage of the survey from 700m to 1400m. The vessel change had an impact on survey catchability, so to account for it conversion factors were applied. Considering the change in depth coverage, trends were examined for 1988-2018 with data up to 700m, and for 2004-2018 with data up to 1400m. Fish community trends were similar between the two datasets, but the analyses including deeper waters showed a comparatively higher levels of benthivores, reflecting the changes in community structure with depth. Generally speaking, trends in average fish size as tracked by the Biomass/Abundance Ratio appeared driven by recruitment, where general declines in abundance and absences of good recruitments got reflected in increases of this ratio. Biomass of plankpiscivores (mostly Sebastes sp.) experienced a sharp increase in the early 2000s but then returned to levels comparable to the 1990s. Piscivores biomass showed a strong decline in the early 1990s due to the collapse of cod but has since shown signs of recovery. Shellfish, driven by northern shrimp, saw a sustained increase in biomass from the early 1990s until 2002, when started a decline that has persisted until 2018. The biomass of large benthivores decline in the late 1990s and remains low to this date.202320232018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/329388reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigoinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3293882026-05-22T06:33:51Z
dc.title.none.fl_str_mv Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
title Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
spellingShingle Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
Koen-Alonso, Mariano
Centro Oceanográfico de Vigo
Pesquerías
title_short Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
title_full Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
title_fullStr Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
title_full_unstemmed Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
title_sort Status and trends of the fish community in the Flemish Cap (NAFO Div. 3M) bioregion
dc.creator.none.fl_str_mv Koen-Alonso, Mariano
Pérez-Rodríguez, Alfonso
Cuff, A.
González-Troncoso, Diana
Sacau-Cuadrado, María del Mar
author Koen-Alonso, Mariano
author_facet Koen-Alonso, Mariano
Pérez-Rodríguez, Alfonso
Cuff, A.
González-Troncoso, Diana
Sacau-Cuadrado, María del Mar
author_role author
author2 Pérez-Rodríguez, Alfonso
Cuff, A.
González-Troncoso, Diana
Sacau-Cuadrado, María del Mar
author2_role author
author
author
author
dc.subject.none.fl_str_mv Centro Oceanográfico de Vigo
Pesquerías
topic Centro Oceanográfico de Vigo
Pesquerías
description This report summarizes fish community trends for the Flemish Cap (NAFO Div. 3M) based on European Union summer trawl research vessel surveys between 1988 and 2018. Species were classified into eight functional groups and trends were described using biomass indices, biomass and abundance anomalies, and fish size (Biomass/Abundance Ratio) anomalies. In 2003, a replacement of the research vessel allowed extending the depth coverage of the survey from 700m to 1400m. The vessel change had an impact on survey catchability, so to account for it conversion factors were applied. Considering the change in depth coverage, trends were examined for 1988-2018 with data up to 700m, and for 2004-2018 with data up to 1400m. Fish community trends were similar between the two datasets, but the analyses including deeper waters showed a comparatively higher levels of benthivores, reflecting the changes in community structure with depth. Generally speaking, trends in average fish size as tracked by the Biomass/Abundance Ratio appeared driven by recruitment, where general declines in abundance and absences of good recruitments got reflected in increases of this ratio. Biomass of plankpiscivores (mostly Sebastes sp.) experienced a sharp increase in the early 2000s but then returned to levels comparable to the 1990s. Piscivores biomass showed a strong decline in the early 1990s due to the collapse of cod but has since shown signs of recovery. Shellfish, driven by northern shrimp, saw a sustained increase in biomass from the early 1990s until 2002, when started a decline that has persisted until 2018. The biomass of large benthivores decline in the late 1990s and remains low to this date.
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/10261/329388
url http://hdl.handle.net/10261/329388
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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