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dc.contributor.authorMahlum, Shad Kenneth
dc.contributor.authorSkoglund, Helge
dc.contributor.authorWiers, Tore
dc.contributor.authorNorman, Eirik
dc.contributor.authorBarlaup, Bjørn Torgeir
dc.contributor.authorWennevik, Vidar
dc.contributor.authorGlover, Kevin
dc.contributor.authorUrdal, Kurt
dc.contributor.authorBakke, Gunnar O
dc.contributor.authorVollset, Knut
dc.PublishedMahlum SK, Skoglund H, Wiers T, Norman ES, Barlaup BT, Wennevik V, Glover KA, Urdal K, Bakke GO, Vollset KW. Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild. Aquaculture Environment Interactions. 2019;11:417-427eng
dc.description.abstractEscaped farmed Atlantic salmon Salmo salar interbreeding with wild conspecifics represents a threat to the genetic integrity and viability of wild populations. Therefore, it is necessary to accurately quantify escapees in riverine systems to monitor and mitigate interactions with wild conspecifics. Drift diving surveys are presently used in Norway to quantify the number of wild and escaped farmed salmon in rivers. However, limited information is available on the validity of the method for distinguishing escapees from wild conspecifics. Comparing the proportion of escapees calculated from drift diving (mean = 8.5%) and net captures (mean = 8.6%), we found that drift diving was well correlated with net captures (adj. r2 = 0.79). Furthermore, scale analysis from an independent data set demonstrated a 98% true positive rate when identifying and capturing farmed escapees during drift diving. The results of this study indicate that drift diving is an accurate and robust method for quantifying escaped farmed salmon, at least in rivers where observation conditions are adequate for snorkeling. In general, drift diving can be a valuable tool for stakeholders to quickly assess broad spatial extents with limited time and resources.en_US
dc.rightsAttribution CC BYeng
dc.titleSwimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wilden_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2019 The Authorsen_US
dc.source.journalAquaculture Environment Interactions

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