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dc.contributor.authorOlsen, Rolf Erik
dc.contributor.authorSkilbrei, Ove
dc.date.accessioned2011-10-28T14:16:01Z
dc.date.available2011-10-28T14:16:01Z
dc.date.issued2010-12-21
dc.identifier.issn1869-215X
dc.identifier.issn1869-7534
dc.identifier.urihttp://hdl.handle.net/11250/117160
dc.description.abstractEscapes of farmed fish from coastal farms around the world are believed to have genetic and ecological consequences for wild fish populations. Each year there are numerous escapes of adult farmed Atlantic salmon Salmo salar. However, survival until maturity appears to be low. One possible explanation is that many of these salmon have difficulties switching to live prey. To address this possibility, growth rate and dietary preference were recorded in recaptured salmon released in 3 groups from August to October 2008 within a small fjord in south-western Norway (Masfjord). The fish were primed with a commercial diet containing 11% of the ‘vegetable oil marker’ 18:2n-6 before release. In the 14.5 to 35.1% of fish recaptured, growth rates were generally good (0.21–1.23% d–1 of fish recaptured in main fjord >2 mo after release), with body weight doubled or more for fish recaptured after 19 wk and thereafter. However, fish recaptured in a small arm of Masfjord (Hopsvåg) had a growth rate close to zero and were in poor condition. While stomachs of recaptured fish were generally empty in the first weeks after release, pellets from fish farms were found in more than 80% of the stomachs after 12 wk and thereafter. Additionally, the level of 18:2n-6 in depot lipids (11% of fatty acids) of the muscle indicated that none of the fish recaptured the following autumn and winter in the vicinity of the release site had switched to wild prey diets. Salmon that escape during autumn are unlikely to compete for prey with wild fish in the vicinity of the release site.en_US
dc.language.isoengen_US
dc.publisherInter-Researchen_US
dc.subjectsalmonen_US
dc.subjectfatty acidsen_US
dc.subjectlaks
dc.subjectfettsyrer
dc.titleFeeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumnen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922en_US
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923en_US
dc.source.pagenumber167-174en_US
dc.source.volume1en_US
dc.source.journalAquaculture Environment Interactionsen_US
dc.source.issue2en_US
dc.identifier.doihttp://dx.doi.org/10.3354/aei00015


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