Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?

12 pages, 1 table, 3 figures

Detalhes bibliográficos
Autores: Prego, R., Carballeira, Rafael, Pazos, Yolanda, Bao, Roberto
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/330414
Acesso em linha:http://hdl.handle.net/10261/330414
Access Level:acceso abierto
Palavra-chave:Harmful algal blooms
HAB
Fish mortality
Marine phytoplankton
Hydrography
Nutrient salts
Salmon aquaculture
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spelling Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?Prego, R.Carballeira, RafaelPazos, YolandaBao, RobertoHarmful algal bloomsHABFish mortalityMarine phytoplanktonHydrographyNutrient saltsSalmon aquaculture12 pages, 1 table, 3 figuresHarmful algal blooms are one of the leading causes of mortality in salmon aquaculture, with significant economic consequences. From 15 to 31 October 1996, a bloom of the skeletonized form of Octactis speculum (Ehrenberg) F.H. Chang, J.M. Grieve & J.E. Sutherland was detected in the small Merexo inlet (1.7 km2 area), located on the southern shore of the Ria of Muxía (Galicia, NW Spain). The O. speculum population inside the inlet (data period: 1992–1996) seldom exceeded 4·103 cell·L−1. However, its concentration reached 2·105 cell·L−1 during the bloom, coinciding with a decrease in light penetration from 5 to 2 m deep, as measured using a Secchi disk. Although similar concentrations were reported during late October 1992, this was the first time that a bloom was associated with caged salmon (Salmo salar, Linnaeus 1758) mortality in the Galician coastal waters. This mortality was not associated with anoxia in the water column, but with fish gill irritations and mucus segregation due to gill clogging. Excess nitrate and silicate, the latter being essential for skeleton formation, were measured in the inlet during the bloom, with phosphate acting as the limiting nutrient (high negative correlation). Blooms of O. speculum occurred in autumn–winter, when water was retained within the inlet under meteorological conditions of southwest winds (which prompted downwelling conditions) and clear skies. A review of the oceanographic database of the Galician rias showed that massive O. speculum proliferations are also commonplace in other rias with similar environmental conditions, such as the Ria of Ares-Betanzos, and can therefore constitute a threat for the development of salmon aquaculture on this coast.This research was funded by the Consolidation and Structuring of Competitive Research Group Océano of the Xunta de Galicia, grant number IN607A2021/04. R.C. was supported by a Juan de la Cierva contract (FJC-2021-046415-I) of the Spanish Ministry of Science and Innovation financed by the Next Generation EU.Peer reviewedMultidisciplinary Digital Publishing InstituteXunta de GaliciaMinisterio de Ciencia e Innovación (España)Agencia Estatal de Investigación (España)Carballeira, Rafael [0000-0002-2807-6942]Bao, Roberto [0000-0002-2928-2836]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2023202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/330414reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI//FJC-2021-046415-IThe underlying dataset has been published as supplementary material of the article in the publishers platform at DOI https://doi.org/10.3390/toxins15070435https://doi.org/10.3390/toxins15070435Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3304142026-05-22T06:33:51Z
dc.title.none.fl_str_mv Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
title Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
spellingShingle Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
Prego, R.
Harmful algal blooms
HAB
Fish mortality
Marine phytoplankton
Hydrography
Nutrient salts
Salmon aquaculture
title_short Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
title_full Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
title_fullStr Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
title_full_unstemmed Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
title_sort Oceanographical Context of the First Bloom of the Silicoflagellate Octactis speculum (Ehrenberg) Recorded to Cause Salmon Mortality in a Galician Ria: Was This Bloom a Rare Event in the Iberian Coast?
dc.creator.none.fl_str_mv Prego, R.
Carballeira, Rafael
Pazos, Yolanda
Bao, Roberto
author Prego, R.
author_facet Prego, R.
Carballeira, Rafael
Pazos, Yolanda
Bao, Roberto
author_role author
author2 Carballeira, Rafael
Pazos, Yolanda
Bao, Roberto
author2_role author
author
author
dc.contributor.none.fl_str_mv Xunta de Galicia
Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
Carballeira, Rafael [0000-0002-2807-6942]
Bao, Roberto [0000-0002-2928-2836]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Harmful algal blooms
HAB
Fish mortality
Marine phytoplankton
Hydrography
Nutrient salts
Salmon aquaculture
topic Harmful algal blooms
HAB
Fish mortality
Marine phytoplankton
Hydrography
Nutrient salts
Salmon aquaculture
description 12 pages, 1 table, 3 figures
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
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/10261/330414
url http://hdl.handle.net/10261/330414
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI//FJC-2021-046415-I
The underlying dataset has been published as supplementary material of the article in the publishers platform at DOI https://doi.org/10.3390/toxins15070435
https://doi.org/10.3390/toxins15070435
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
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 15,812429

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