Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/29330
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dc.contributor.authorMorro, Bernaten_UK
dc.contributor.authorBalseiro, Pabloen_UK
dc.contributor.authorAlbalat, aAmayaen_UK
dc.contributor.authorPedrosa, Cindyen_UK
dc.contributor.authorMackenzie, Simonen_UK
dc.contributor.authorNakamura, Shuen_UK
dc.contributor.authorShimizu, Munetakaen_UK
dc.contributor.authorNilsen, Tom Oen_UK
dc.contributor.authorSveier, Haralden_UK
dc.contributor.authorEbbesson, Lars Oen_UK
dc.contributor.authorHandeland, Sigurd Oen_UK
dc.date.accessioned2019-04-17T00:00:47Z-
dc.date.available2019-04-17T00:00:47Z-
dc.date.issued2019-05-30en_UK
dc.identifier.urihttp://hdl.handle.net/1893/29330-
dc.description.abstractPhotoperiod is thought to be the main zeitgeber that induces smoltification in salmonids. However, its effects on the smoltification of rainbow trout (Oncorhynchus mykiss) are not fully understood and no published data documents the effects of the photoperiod regime currently used commercially, continuous light (LL). The present study compared the effect of four different photoperiod regimes (i.e. advanced phase photoperiod (APP), delayed phase photoperiod (DPP), LL and simulated natural photoperiod (SNP)) on the smoltification and growth of juvenile rainbow trout during their freshwater phase of winter-spring and the following summer post smolt phase. Smoltification was evaluated by monitoring gill Na+,K+–ATPase (NKA) activity and transcription of NKA α-subunit isoforms 1a and 1b, and Na+,K+,2Cl− cotransporter 1a. Growth was measured as specific growth rate of both length and weight, and through molecular growth proxies such as the levels of circulating insulin-like growth factor 1 (IGF-I) in plasma and transcription of igf-I, igf binding protein 1b (igfbp1b), growth hormone receptor 1 (ghr1) and cathepsin L (ctsl) in the liver. Results indicate that APP induces a longer smolt window and higher levels of plasma IGF-I in both freshwater and seawater (two months post transfer), while DPP led to a shorter smolt window, lower plasma IGF-I levels in freshwater and seawater, an earlier decrease in liver igf-I and ctsl transcription in freshwater (as seen by modelling over time) and lower specific growth rate in freshwater. The transcription analysis of osmoregulatory genes complemented NKA activity and allowed for the detection of a transient response to light and of differences between the osmoregulatory capacity of parr and desmolted fish. Furthermore, an upregulation of the liver transcription of igf-I, ghr1 and ctsl was found in all treatments during the smolt window, which corresponded to the periods with highest growth. Finally, both plasma IGF-I and liver igf-I in seawater were found to be significantly correlated to fish growth in seawater. However, our data did not show that plasma IGF-I prior to seawater transfer could be used as a reliable predictor of growth in seawater. Overall, and especially when compared with other salmonid species, photoperiod seems to be a weaker inducer of smoltification in rainbow trout, according to the parameters that were tested, suggesting that other environmental cues might be more important drivers of this process.en_UK
dc.language.isoenen_UK
dc.publisherElsevier BVen_UK
dc.relationMorro B, Balseiro P, Albalat a, Pedrosa C, Mackenzie S, Nakamura S, Shimizu M, Nilsen TO, Sveier H, Ebbesson LO & Handeland SO (2019) Effects of different photoperiod regimes on the smoltification and seawater adaptation of seawater-farmed rainbow trout (Oncorhynchus mykiss): Insights from Na+, K+-ATPase activity and transcription of osmoregulation and growth regulation genes. Aquaculture, 507, pp. 282-292. https://doi.org/10.1016/j.aquaculture.2019.04.039en_UK
dc.rightsThis article is available under the terms of the Creative Commons Attribution License (CC BY - https://creativecommons.org/licenses/by/4.0/). You may copy and distribute the article, create extracts, abstracts and new works from the article, alter and revise the article, text or data mine the article and otherwise reuse the article commercially (including reuse and/or resale of the article) without permission from Elsevier. You must give appropriate credit to the original work, together with a link to the formal publication through the relevant DOI and a link to the Creative Commons user license above. You must indicate if any changes are made but not in any way that suggests the licensor endorses you or your use of the work.en_UK
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_UK
dc.subjectInsulin-like growth factor 1en_UK
dc.subjectnkaα1en_UK
dc.subjectnkcc1aen_UK
dc.subjectSodium–potassium pumpen_UK
dc.subjectSteelhead trouten_UK
dc.subjectWinter signalen_UK
dc.titleEffects of different photoperiod regimes on the smoltification and seawater adaptation of seawater-farmed rainbow trout (Oncorhynchus mykiss): Insights from Na+, K+-ATPase activity and transcription of osmoregulation and growth regulation genesen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1016/j.aquaculture.2019.04.039en_UK
dc.citation.jtitleAquacultureen_UK
dc.citation.issn0044-8486en_UK
dc.citation.volume507en_UK
dc.citation.spage282en_UK
dc.citation.epage292en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.funderRegionale Foskningsfond Vestalandeten_UK
dc.author.emailamaya.albalat@stir.ac.uken_UK
dc.citation.date15/04/2019en_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationNORCE - Norwegian Research Centre ASen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationNORCE - Norwegian Research Centre ASen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationHokkaido Universityen_UK
dc.contributor.affiliationHokkaido Universityen_UK
dc.contributor.affiliationNORCE - Norwegian Research Centre ASen_UK
dc.contributor.affiliationLeroy Seafood Groupen_UK
dc.contributor.affiliationNORCE - Norwegian Research Centre ASen_UK
dc.contributor.affiliationNORCE - Norwegian Research Centre ASen_UK
dc.identifier.isiWOS:000471112700034en_UK
dc.identifier.scopusid2-s2.0-85064506321en_UK
dc.identifier.wtid1270725en_UK
dc.contributor.orcid0000-0002-8606-2995en_UK
dc.contributor.orcid0000-0003-1845-6826en_UK
dc.date.accepted2019-04-11en_UK
dcterms.dateAccepted2019-04-11en_UK
dc.date.filedepositdate2019-04-16en_UK
rioxxterms.apcpaiden_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorMorro, Bernat|en_UK
local.rioxx.authorBalseiro, Pablo|en_UK
local.rioxx.authorAlbalat, aAmaya|0000-0002-8606-2995en_UK
local.rioxx.authorPedrosa, Cindy|en_UK
local.rioxx.authorMackenzie, Simon|0000-0003-1845-6826en_UK
local.rioxx.authorNakamura, Shu|en_UK
local.rioxx.authorShimizu, Munetaka|en_UK
local.rioxx.authorNilsen, Tom O|en_UK
local.rioxx.authorSveier, Harald|en_UK
local.rioxx.authorEbbesson, Lars O|en_UK
local.rioxx.authorHandeland, Sigurd O|en_UK
local.rioxx.project248020|Regionale Foskningsfond Vestalandet|en_UK
local.rioxx.freetoreaddate2019-04-16en_UK
local.rioxx.licencehttp://creativecommons.org/licenses/by/4.0/|2019-04-16|en_UK
local.rioxx.filename1-s2.0-S0044848618325614-main.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source0044-8486en_UK
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