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More than one way to smoltify a salmon? Effects of dietary and light treatment on smolt development and seawater growth performance in Atlantic salmon

2021-02Journal article Restricted
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dc.contributor.authorStriberny, Anja
dc.contributor.authorLauritzen, Daniel E.
dc.contributor.authorFuentes, Juan
dc.contributor.authorCampinho, Marco António
dc.contributor.authorGaetano, Pasqualina
dc.contributor.authorDuarte, Vilma
dc.contributor.authorHazlerigg, David G.
dc.contributor.authorJorgensen, Even H.
dc.date.accessioned2021-09-08T10:58:06Z
dc.date.available2021-09-08T10:58:06Z
dc.date.issued2021-02
dc.description.abstractPost-smolt mortality and stunted growth is a problem in Norwegian salmon farming that can be partly traced back to sub-optimal smolt quality in connection with ongoing changes in smolt production practices. In the present study, we compared smolt development and post-smolt performance in seawater (SW) of Atlantic salmon subjected to 1) traditional light treatment (short photoperiod (SP) long photoperiod (LL)), 2) a dietary treatment alone (LL-LL + diet), 3) a combination of light and diet (SP-LL + diet) treatment and 4) no stimulation (LL-LL control) during the freshwater (FW) phase. The transition diet consisted of feed supplemented with a salt mixture and the amino acid tryptophan. Effects of light and dietary treatment were tested on two different size classes (40 and 130 g) of parr. Response patterns to treatments were independent of initial size and findings discussed below apply to both. Fish in the continuous light groups (LL-LL and LL-LL + diet) had the highest mass gain during the FW phase while light treated fish had a reduction in condition factor indicative of a true smolting. Hypoosmoregulatory ability in May was increased by diet, but not by light. However, a strong and treatment independent decrease in gill NKA alpha 1a gene expression indicated a complete shift from a FWto a SW type gill Na+, K+-ATPase. Moreover, plasma Cl- concentration and osmolality after 7 days in SW in May were well within the range expected for fully SW adapted fish in all treatment groups. Despite good hypoosmoregulatory abilities in all fish, there were strong treatment dependent effects on their growth during the two month SW residence. SW growth was negatively correlated with growth and change in K during the last part of the FW phase. A markedly higher specific growth rate and appetite in the SP-LL group than in the LL-LL group was likely a result of the light stimulated endocrine changes that occurred during smolting. Dietary treatment seemed to compensate for the lack of light treatment since feed intake and growth in LL-LL + diet fish was comparable to that in the SP-LL treated smolts. Feed intake and growth in the SP-LL + diet groups was highest, giving support for a notion that light and diet act through separate and additive mechanisms.
dc.description.sponsorshipFHF -Norwegian Seafood Research Fund [901432]; Portuguese Foundation for Science and Technology (FCT)Portuguese Foundation for Science and Technology [UID/Multi/04326/2019]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.aquaculture.2020.736044
dc.identifier.issn0044-8486
dc.identifier.urihttp://hdl.handle.net/10400.1/17031
dc.language.isoeng
dc.peerreviewedyes
dc.publisherELSEVIER
dc.relationCentre of Marine Sciences
dc.subjectAtlantic salmon
dc.subjectSmolting
dc.subjectDietary treatment
dc.subjectHypoosmoregulation
dc.subjectSeawater performance
dc.subject.otherFisheries; Marine & Freshwater Biology
dc.titleMore than one way to smoltify a salmon? Effects of dietary and light treatment on smolt development and seawater growth performance in Atlantic salmon
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre of Marine Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04326%2F2019/PT
oaire.citation.startPage736044
oaire.citation.titleAquaculture
oaire.citation.volume532
oaire.fundingStream6817 - DCRRNI ID
person.familyNameFuentes
person.familyNameCampinho
person.familyNameGaetano
person.familyNameFernandes Duarte
person.givenNameJuan
person.givenNameMarco António
person.givenNamePasqualina
person.givenNameVilma Vanessa
person.identifier392998
person.identifier2193357
person.identifier.ciencia-id421B-E196-2C33
person.identifier.ciencia-id0E18-2560-6EC1
person.identifier.ciencia-idF110-5D6E-33CB
person.identifier.orcid0000-0003-0430-8734
person.identifier.orcid0000-0002-5238-0506
person.identifier.orcid0000-0001-5181-9073
person.identifier.orcid0000-0002-3007-6167
person.identifier.ridD-8833-2013
person.identifier.scopus-author-id7201832526
person.identifier.scopus-author-id8938999600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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