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Thyroid function of steatitis-affected Mozambique tilapia Oreochromis mossambicus from a sub-tropical African reservoir

2017-07Journal article Restricted access
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dc.contributor.authorDabrowski, J.
dc.contributor.authorOberholster, P.
dc.contributor.authorSteyl, J.
dc.contributor.authorOsthoff, G.
dc.contributor.authorHugo, A.
dc.contributor.authorPower, Deborah M
dc.contributor.authorvan Wyk, J. H.
dc.date.accessioned2019-11-20T15:07:29Z
dc.date.available2019-11-20T15:07:29Z
dc.date.issued2017-07
dc.description.abstractThyroid function and nutritional indicators were measured in obese, steatitis-affected Mozambique tilapia Oreochromis mossambicus from Loskop Reservoir (LR), South Africa. Plasma thyroid hormones (especially T3) and thyroid follicle histomorphology revealed high levels of activity in every aspect of the thyroid cascade measured in fish from LR compared to a reference population of steatitis-free fish. Concurrent measurements of nutritional state including plasma lipids, liver lipid content and hepatocyte size showed that fish from LR had significant energy stores indicative of abundant nutritional intake. There were distinct sex and seasonal differences, with the highest plasma lipids and T3 levels observed in steatitis-affected females during spring and summer. Positive correlations were observed between plasma lipids (especially cholesterol) and T3 concentrations in fish from both populations, indicating a link between lipid metabolism and thyroid function. There was no direct evidence of thyroid disruption, but this cannot be ruled out until further research determines the factors that underlie the homeostatic shift leading to elevated plasma and liver lipids and T3 levels in steatitis-affected tilapia.
dc.description.sponsorshipNational Research Foundation (NRF)
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.3354/dao03138
dc.identifier.issn0177-5103
dc.identifier.issn1616-1580
dc.identifier.urihttp://hdl.handle.net/10400.1/13063
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInter-Research
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectYellow fat disease
dc.subjectSalvelinus-fontinalis mitchill
dc.subjectKruger-National-Park
dc.subjectSouth-Africa
dc.subjectOlifants River
dc.subjectTeleost fish
dc.subjectEndocrine disruption
dc.subjectStress-response
dc.subjectWater-quality
dc.subjectBrook trout
dc.titleThyroid function of steatitis-affected Mozambique tilapia Oreochromis mossambicus from a sub-tropical African reservoir
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage113
oaire.citation.issue2
oaire.citation.startPage101
oaire.citation.titleDiseases of Aquatic Organisms
oaire.citation.volume125
person.familyNamePower
person.givenNameDeborah Mary
person.identifier.ciencia-id891A-8A44-3CAE
person.identifier.orcid0000-0003-1366-0246
person.identifier.scopus-author-id7101806760
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationc68f5ffb-63f6-4c70-8957-29e464fb59c0
relation.isAuthorOfPublication.latestForDiscoveryc68f5ffb-63f6-4c70-8957-29e464fb59c0

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