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dc.contributor.authorOldham, Tina
dc.contributor.authorDempster, Tim
dc.contributor.authorFosse, Jan Olav
dc.contributor.authorOppedal, Frode
dc.date.accessioned2018-01-17T09:47:47Z
dc.date.available2018-01-17T09:47:47Z
dc.date.created2018-01-12T19:50:23Z
dc.date.issued2017
dc.identifier.citationAquaculture Environment Interactions. 2017, 9 (1), 145-153.
dc.identifier.issn1869-215X
dc.identifier.urihttp://hdl.handle.net/11250/2477897
dc.description.abstractDissolved oxygen (DO) conditions in marine aquaculture cages are heterogeneous and fluctuate rapidly. Here, by temporarily wrapping a tarpaulin around the top 0 to 6 m of a marine cage (~2000 m3), we manipulated DO to evaluate the behavioural response of Atlantic salmon Salmo salar to hypoxia. Videos were recorded before, during and after DO manipulation at 3 m depth while vertical profiles of temperature, salinity, DO and fish density were continuously measured. The trial was repeated 4 times over a 2 wk period. Temperature and salinity profiles varied little across treatment periods; however, DO saturation was reduced at all depths in all replicate trials during the tarpaulin treatment compared to the periods before or after. In 3 out of 4 trials, swim speeds were 1.5 to 2.7 times slower during the tarpaulin treatment than the before or after periods. Significant changes in vertical distribution of fish density and DO were observed between treatment periods in all replicate trials; salmon swam either above or below the most hypoxic depth layer (59 to 62% DO saturation). In a regression tree analysis, the relative influence of DO in determining fish distribution was 17%, while temperature (39%) and salinity (44%) explained the majority of variation. Our results demonstrate that salmon are capable of modifying their distribution and possibly activity levels in response to intermediate DO levels, but that DO is not a primary driver of behaviour at the saturation levels examined in this study.
dc.language.isoeng
dc.titleOxygen gradients affect behaviour of caged Atlantic salmon Salmo salar
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
dc.source.pagenumber145-153
dc.source.volume9
dc.source.journalAquaculture Environment Interactions
dc.source.issue1
dc.identifier.doi10.3354/aei00219
dc.identifier.cristin1541932
cristin.unitcode7431,4,3,0
cristin.unitcode7431,14,0,0
cristin.unitnameStasjon Matre
cristin.unitnameDyrevelferd
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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