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Occurrence and characterization of pearls from oysters of the genus Crassostrea

2017-03Journal article Restricted access
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dc.contributor.authorBatista, Frederico
dc.contributor.authorGrade, Ana
dc.contributor.authorPower, Deborah
dc.contributor.authorRuano, Francisco
dc.contributor.authorHarper, Elizabeth M.
dc.date.accessioned2019-11-20T15:07:46Z
dc.date.available2019-11-20T15:07:46Z
dc.date.issued2017-03
dc.description.abstractThe occurrence of pearls in the true' oysters, the Ostreioidea, is poorly documented despite being the most produced mollusc species in the world. Oysters of the Crassostrea genus were collected in two different sites in southern Portugal where both Crassostrea angulata and C. gigas are present, namely in: (1) the Ria Formosa lagoon where pearls were not observed (N = 446); and (2) the Guadiana estuary where pearls were found in 12 out of the 798 oysters analysed. The pearls were located mainly at the edge of the right mantle lobe in the inhalant chamber and their maximum length ranged from 0.9 to 5.5 mm. Almost all the pearls had a white-cream colouration with the exception of two pearls that had a black-brown colour. X-ray diffraction analysis of one pearl showed that it was entirely calcitic with no traces of either aragonite or vaterite. The pearls observed were therefore non-nacreous pearls. Scanning electron microscopy (SEM) revealed a diversity of microstructures including prismatic, foliae-like sheets and blocky textures, i.e. highly reminiscent of the host oyster shell microstructures. Parasites (e.g. parasitic copepods, Haplosporidium-like plasmodia) and signs of diseases (e.g. foot disease) were observed in some of the oysters analysed, but they were not associated with the occurrence of pearls. The present work is one of the few studies on the occurrence of natural pearls in true' oysters and to our knowledge the first description of their microstructure by SEM.
dc.description.sponsorshipPROSANI [31-03-01-FEP-002]
dc.description.sponsorshipEuropean Union Atlantic Area Transnational Programme [2009-1/123]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1017/S0025315416000382
dc.identifier.issn0025-3154
dc.identifier.issn1469-7769
dc.identifier.urihttp://hdl.handle.net/10400.1/13207
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCambridge Univ Press
dc.subjectWater
dc.subjectAragonite
dc.subjectVaterite
dc.subjectMatrix
dc.subjectHost
dc.titleOccurrence and characterization of pearls from oysters of the genus Crassostrea
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage302
oaire.citation.issue2
oaire.citation.startPage297
oaire.citation.titleJournal of the Marine Biological Association of the United Kingdom
oaire.citation.volume97
person.familyNameBatista
person.familyNamePower
person.givenNameFrederico
person.givenNameDeborah Mary
person.identifier.ciencia-idCB1B-7DBC-6303
person.identifier.ciencia-id891A-8A44-3CAE
person.identifier.orcid0000-0002-2848-3011
person.identifier.orcid0000-0003-1366-0246
person.identifier.ridF-5651-2010
person.identifier.scopus-author-id7003808684
person.identifier.scopus-author-id7101806760
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationd564e68d-a75e-458f-add4-bdb0739cde8d
relation.isAuthorOfPublicationc68f5ffb-63f6-4c70-8957-29e464fb59c0
relation.isAuthorOfPublication.latestForDiscoveryd564e68d-a75e-458f-add4-bdb0739cde8d

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