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Understanding planktonic diatoms to inform site selection for shellfish offshore aquaculture systems

2025-08Journal article Open access
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dc.contributor.authorAraújo Freitas, Carla Alexandra
dc.contributor.authorGoela, Priscila
dc.contributor.authorIcely, John
dc.contributor.authorDias Duarte Fragoso, Bruno
dc.contributor.authorde Oliveira Júnior, Luciano
dc.contributor.authorCristina, Sónia
dc.contributor.authorNewton, Alice
dc.date.accessioned2025-07-16T11:50:40Z
dc.date.available2025-07-16T11:50:40Z
dc.date.issued2025-08
dc.description.abstractSustainable bivalve aquaculture offers a solution to rising food demand. This study aimed to help identify suitable offshore shellfish aquaculture sites in coastal upwelling regions. Here, planktonic diatom abundance, crucial for bivalve growth, is a key success factor. A successful bivalve production area was analysed to understand how diatom dynamics and upwelling influence a suitable location for shellfish offshore aquaculture. A diatom-based criterion for site selection is proposed. Surface water samples were collected over two years in southwest Iberia, near a major upwelling centre. Phytoplankton abundance and composition were assessed along with chlorophyll-a concentration and wind-stress upwelling indices. Episodes of high diatom concentrations were frequent and distributed throughout the year. Most diatom blooms were dominated by Pseudo-nitzschia, particularly the delicatissima group. Although this genus is potentially toxic, the levels of amnesic shellfish poisoning (ASP) toxin-the domoic acid (DA) in bivalves were mostly low or undetectable, even during periods of high Pseudo-nitzschia abundances. Conversely, the less abundant Pseudo-nitzschia seriata group presence often coincided with detectable DA in bivalves. These findings suggest that high Pseudo-nitzschia abundance does not hinder aquaculture and may even benefit it when the delicatissima group prevails in high numbers. Focusing on the Pseudo-nitzschia seriata group in predictive models may better predict DA levels for harvest closures, minimising economic losses and health risks. This is particularly true for locations where the seriata group is the one linked to DA production. Additionally, we identified oceanographic conditions coinciding with DA levels exceeding regulatory limit.eng
dc.identifier.doi10.1016/j.marenvres.2025.107200
dc.identifier.issn0141-1136
dc.identifier.urihttp://hdl.handle.net/10400.1/27416
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationCoastal circulation along the northern shelf of the Gulf of Cadiz
dc.relationAquatic Research Infrastructure Network
dc.relation.ispartofMarine Environmental Research
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectDiatoms
dc.subjectPseudo-nitzschia
dc.subjectPortuguese coast
dc.subjectUpwelling
dc.subjectBivalves
dc.subjectOffshore aquaculture
dc.titleUnderstanding planktonic diatoms to inform site selection for shellfish offshore aquaculture systemseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCoastal circulation along the northern shelf of the Gulf of Cadiz
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F140250%2F2018/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0069%2F2020/PT
oaire.citation.issue107200
oaire.citation.titleMarine Environmental Research
oaire.citation.volume209
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameAraújo Freitas
person.familyNameGoela
person.familyNameIcely
person.familyNameDias Duarte Fragoso
person.familyNamede Oliveira Júnior
person.familyNameCristina
person.familyNameNewton
person.givenNameCarla Alexandra
person.givenNamePriscila
person.givenNameJohn
person.givenNameBruno
person.givenNameLuciano
person.givenNameSónia
person.givenNameAlice
person.identifier333937
person.identifier.ciencia-id0F13-5481-FF35
person.identifier.ciencia-idB713-3911-1803
person.identifier.ciencia-id2C1A-11F1-3BF2
person.identifier.ciencia-idEA1D-0D5C-8C56
person.identifier.ciencia-id6F13-1247-B2B7
person.identifier.orcid0000-0001-9786-1269
person.identifier.orcid0000-0002-9114-8283
person.identifier.orcid0000-0003-4531-3265
person.identifier.orcid0000-0001-5899-2979
person.identifier.orcid0000-0002-5716-9750
person.identifier.orcid0000-0001-9286-5914
person.identifier.scopus-author-id55957312000
person.identifier.scopus-author-id6506626316
person.identifier.scopus-author-id7201391894
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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