Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/2996
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dc.contributor.authorLeclercq, Ericen_UK
dc.contributor.authorTaylor, Johnen_UK
dc.contributor.authorSprague, Matthewen_UK
dc.contributor.authorMigaud, Herveen_UK
dc.date.accessioned2013-06-09T07:05:15Z-
dc.date.available2013-06-09T07:05:15Z-
dc.date.issued2011-03en_UK
dc.identifier.urihttp://hdl.handle.net/1893/2996-
dc.description.abstractThe aim of this study was to compare the efficiency of new candidate lighting-technologies (50W ‘blue’ light-emitting-diode (B, λmax = 465 nm); 232 W ‘green’ hot cathode, (G, λmax = 546 nm); 400 W ‘red’ tungsten-halogen, (R, λmax = 667 to 740 nm)) against a standard 400 W ‘white’ metal-halide used as control technology (C, broad spectrum) at suppressing sexual maturation of 1+ Atlantic salmon (Salmo salar) in sea-cages. A total of seven experimental set-ups were tested on a commercial-scale in three trials using a standardised photoperiod regime in the form of continuous artificial-light (LL) applied from winter to summer solstice during the second year at sea. The experimental stocks were raised under an ambient thermal regime that was similar across all trials. Technical performances (spectral output, light-attenuation and irradiance distance) of the individual light-units were measured and light-perception was assessed by quantifying plasma melatonin levels. Body-size parameters (BW, FL, K) were measured at the switch-on and turn-off of the photoperiod regimes. Maturation rates were estimated at the end of the light-treatments and at harvest. The B-unit provided the shortest effective irradiance distance (distance from the light-bulb to the minimum irradiance suppressing plasma melatonin to basal day-time level = 0.016 W m-2) but the longest relative to its energy consumption; while the G- and R-units did not offer a comparative advantage over the C-unit in that regard (B>C>G>R). Nocturnal plasma-melatonin and maturation rate decreased proportionally to the light-intensity provided using a range of technologies emitting distinct spectral profiles. Light-intensity rather than light-spectral composition appeared to be the prime parameter negatively affecting sexual maturation. Maximal suppression of maturation was observed in treatments depressing nocturnal plasma melatonin to a 1.2-fold but not to a 1.7-fold increase compared to daytime levels, confirming that a threshold level of light-irradiance is necessary to obtain the desired effect. Results suggest that this can be achieved under standard commercial practices by applying, over the photoperiod regime presently used, continuous artificial-illumination with an (electrical) energy consumption of 0.28 Wh m-3 generating a mean-irradiance of 0.012 W m-2 and providing a minimum volume of effective irradiance equivalent to 12% of the rearing-environment. Such a low volume of biologically effective irradiance was likely sufficient due to the strong photic attraction already reported in Atlantic salmon. Maximal suppression of pre-harvest sexual maturation can be achieved in the Atlantic salmon on-growing industry using alternative light-technologies. Present data provides methods and threshold values favouring the implementation of photoperiod-manipulation to suppress pre-harvest maturation at the most advantageous scale and cost.en_UK
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.relationLeclercq E, Taylor J, Sprague M & Migaud H (2011) The potential of alternative lighting-systems to suppress pre-harvest sexual maturation of 1+ Atlantic salmon (Salmo salar) post-smolts reared in commercial sea-cages. Aquacultural Engineering, 44 (2), pp. 35-47. https://doi.org/10.1016/j.aquaeng.2010.12.001en_UK
dc.rightsPublished in Aquacultural Engineering by Elsevieren_UK
dc.subjectSalmo salaren_UK
dc.subjectlighting-technologyen_UK
dc.subjectlight-intensityen_UK
dc.subjectsexual maturationen_UK
dc.subjectmelatoninen_UK
dc.subjectAtlantic salmonen_UK
dc.subjectPhotoperiodismen_UK
dc.subjectFishes Growthen_UK
dc.titleThe potential of alternative lighting-systems to suppress pre-harvest sexual maturation of 1+ Atlantic salmon (Salmo salar) post-smolts reared in commercial sea-cagesen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1016/j.aquaeng.2010.12.001en_UK
dc.citation.jtitleAquacultural Engineeringen_UK
dc.citation.issn0144-8609en_UK
dc.citation.volume44en_UK
dc.citation.issue2en_UK
dc.citation.spage35en_UK
dc.citation.epage47en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusAM - Accepted Manuscripten_UK
dc.author.emaillecleric@yahoo.fren_UK
dc.citation.date21/12/2010en_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.identifier.isiWOS:000288825500001en_UK
dc.identifier.scopusid2-s2.0-79951959697en_UK
dc.identifier.wtid838076en_UK
dc.contributor.orcid0000-0003-4370-7922en_UK
dc.contributor.orcid0000-0002-0723-2387en_UK
dc.contributor.orcid0000-0002-5404-7512en_UK
dc.date.accepted1990-01-01en_UK
dcterms.dateAccepted1990-01-01en_UK
dc.date.filedepositdate2011-05-04en_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionAMen_UK
local.rioxx.authorLeclercq, Eric|en_UK
local.rioxx.authorTaylor, John|0000-0003-4370-7922en_UK
local.rioxx.authorSprague, Matthew|0000-0002-0723-2387en_UK
local.rioxx.authorMigaud, Herve|0000-0002-5404-7512en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2011-05-04en_UK
local.rioxx.licencehttp://www.rioxx.net/licenses/all-rights-reserved|2011-05-04|en_UK
local.rioxx.filenameLeclercqLightTech.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source0144-8609en_UK
Appears in Collections:Aquaculture Journal Articles

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