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Cortisol and testosterone accumulation in a low pH recirculating aquaculture system for rainbow trout (Oncorhynchus mykiss)

dc.contributor.authorMota, Vasco
dc.contributor.authorMartins, Catarina I. M.
dc.contributor.authorEding, Ep H.
dc.contributor.authorCanario, Adelino V. M.
dc.contributor.authorVerreth, Johan A. J.
dc.date.accessioned2018-12-07T14:53:17Z
dc.date.available2018-12-07T14:53:17Z
dc.date.issued2017-07
dc.description.abstractSteroids accumulate in recirculating aquaculture system (RAS), although explanatory factors for such accumulation are still poorly explored. This study investigated the effect of water exchange rate and pH in six replicated RAS on the concentration of the stress hormone cortisol in rainbow trout blood plasma and in the holding water and of the sex steroids testosterone, 11-ketotestosterone (11-KT) and 17,20-dihydroxypregn-4-en-3-one (17,20-P) over a 70-day experimental period. Three combinations of water exchange rate and pH were used each treatment, with two replications: (i) high water exchange rate (+/- 1700Lkg(-1) feed) and neutral pH (+/- 7.3), (ii) low water exchange rate (+/- 500Lkg(-1) feed) and neutral pH (+/- 7.3) and (iii) low water exchange rate (+/- 500Lkg(-1) feed) and low pH (+/- 5.8). Plasma cortisol concentrations at day 70 were higher (24.4 +/- 9.5ngmL(-1)) for fish kept at low pH when compared to fish kept at neutral pH (12.0 +/- 0.1 and 8.7 +/- 0.2ngmL(-1)). Water cortisol and testosterone concentrations at day 35 were higher at low pH than at neutral pH, whereas water 11-KT and 17,20-P did not differ among treatments. At day 70, there were no significant differences between low and high pH. These results demonstrate that low pH contributes to increased plasma cortisol concentrations and to its accumulation in water, possibly indicating a stress response to low pH. The higher concentration of testosterone but not of the other sex hormones point to unspecified reproductive effects that need further investigation.
dc.description.sponsorshipPhD scholarship - FCT - the National Foundation for Science and Technology of Portugal through QREN-POPH Advanced Training European Social Fund and National funds (MEC) [SFRH/BD/65673/2009]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1111/are.13184
dc.identifier.issn1355-557X
dc.identifier.issn1365-2109
dc.identifier.urihttp://hdl.handle.net/10400.1/11436
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWiley
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAtlantic salmon
dc.subjectNoninvasive measurement
dc.subjectSexual-maturation
dc.subjectSteroid-hormones
dc.subjectWater
dc.subjectFish
dc.subjectPlasma
dc.subjectStress
dc.subjectGrowth
dc.subjectSalar
dc.titleCortisol and testosterone accumulation in a low pH recirculating aquaculture system for rainbow trout (Oncorhynchus mykiss)
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F65673%2F2009/PT
oaire.citation.endPage3588
oaire.citation.issue7
oaire.citation.startPage3579
oaire.citation.titleAquaculture Research
oaire.citation.volume48
oaire.fundingStreamSFRH
person.familyNameMota
person.familyNameCanario
person.givenNameVasco
person.givenNameAdelino
person.identifier143624
person.identifier.ciencia-id1F1E-D3B3-F804
person.identifier.orcid0000-0002-9718-6440
person.identifier.orcid0000-0002-6244-6468
person.identifier.ridE-2905-2019
person.identifier.ridC-7942-2009
person.identifier.scopus-author-id56255184300
person.identifier.scopus-author-id56568523700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication5eb995f3-5056-4564-b46a-4a6acf1d12c7
relation.isAuthorOfPublication5f6e51ee-9113-469e-8b9e-f30f2d452521
relation.isAuthorOfPublication.latestForDiscovery5eb995f3-5056-4564-b46a-4a6acf1d12c7
relation.isProjectOfPublicationcf408491-8873-4a70-b25e-ea7e18759351
relation.isProjectOfPublication.latestForDiscoverycf408491-8873-4a70-b25e-ea7e18759351

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