Show simple item record

dc.contributor.authorWright, Daniel William
dc.contributor.authorGeitung, Lena
dc.contributor.authorKarlsbakk, Egil
dc.contributor.authorStien, Lars Helge
dc.contributor.authorDempster, Timothy David
dc.contributor.authorOldham, Tina
dc.contributor.authorNola, Velimir
dc.contributor.authorOppedal, Frode
dc.date.accessioned2018-09-13T08:52:50Z
dc.date.available2018-09-13T08:52:50Z
dc.date.created2018-08-29T13:28:08Z
dc.date.issued2018
dc.identifier.citationAquaculture Environment Interactions. 2018, 10 255-265.nb_NO
dc.identifier.issn1869-215X
dc.identifier.urihttp://hdl.handle.net/11250/2562418
dc.description.abstractSurface environment modification is a potential parasite control strategy in Atlantic salmon sea-cage farming. For instance, a temporary low salinity surface layer in commercial-scale snorkel sea-cages has coincided with reduced amoebic gill disease (AGD) levels after an outbreak. We tested if a permanent freshwater (FW) surface layer in snorkel sea-cages would lower AGD and salmon lice levels of stock relative to snorkel cages with seawater (SW) only and standard production cages with no snorkels. Triplicate cages of each type with 2000 post-smolts were monitored in autumn to winter for 8 wk and sampled 4 times. Lower proportions of individuals with elevated AGD-related gill scores were registered in SW and FW snorkel cages compared to standard cages; however, these proportions did not differ between SW and FW snorkel cages. Individuals positive for AGD-causing Paramoeba perurans were reduced by 65% in FW snorkel relative to standard cages, but values were similar between SW snorkel cages and other types. While total lice burdens were reduced by 38% in SW snorkel compared to standard cages, they were unchanged between FW snorkel and other cage types. Fish welfare and growth were unaffected by cage type. Surface activity was detected in all cages; however, more surface jumps were recorded in standard than snorkel cages. Overall, fish in FW snorkel cages appeared to reside too little in freshwater to consistently reduce AGD levels and salmon lice compared to SW snorkel cages. Further work should test behavioural and environmental manipulations aimed at increasing freshwater or low salinity surface layer use.nb_NO
dc.language.isoengnb_NO
dc.titleSurface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfarenb_NO
dc.title.alternativeSurface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfarenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber255-265nb_NO
dc.source.volume10nb_NO
dc.source.journalAquaculture Environment Interactionsnb_NO
dc.identifier.doi10.3354/AEI00269
dc.identifier.cristin1605281
dc.relation.projectNorges forskningsråd: 267800nb_NO
dc.relation.projectNorges forskningsråd: 256318nb_NO
cristin.unitcode7431,14,0,0
cristin.unitnameDyrevelferd
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record