Blar i Published externally på forfatter "Bjørn, Pål Arne"
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Aquaculture-driven evolution: distribution of pyrethroid resistance in the salmon louse throughout the North Atlantic in the years 2000–2017
Fjørtoft, Helene Børretzen; Nilsen, Frank; Besnier, Francois; Espedal, Per Gunnar; Stene, Anne; Tveten, Ann-Kristin; Bjørn, Pål Arne; Aspehaug, Vidar; Glover, Kevin (Peer reviewed; Journal article, 2020)The parasitic salmon louse, and its documented resistance to chemotherapeutants, represents the most persistent environmental challenge to global salmonid aquaculture. We used a genetic marker associated with pyrethroid ... -
Area protection may reduce salmon louse infection risk to wild salmonids
Bjørn, Pål Arne; Sivertsgård, Rolf; Finstad, Bengt; Nilsen, Rune; Serra-Llinares, Rosa Maria; Kristoffersen, Roar (Peer reviewed; Journal article, 2011) -
Behaviour and habitat use of first-time migrant Arctic charr: novel insights from a subarctic marine area
Nordli, Eivind; Strøm, John Fredrik; Bøhn, Thomas; Thorstad, Eva Bonsak; Serra Llinares, Rosa Maria; Nilsen, Rune; Bjørn, Pål Arne (Peer reviewed; Journal article, 2023)Anadromous Arctic charr Salvelinus alpinus is a cold-adapted salmonid that is vulnerable to climate warming and anthropogenic activities including salmon farming, hydropower regulation, and pollution, which poses a ... -
Behavioural responses of wild anadromous Arctic char experimentally infested in situ with salmon lice
Strøm, John Fredrik; Bjørn, Pål Arne; Bygdnes, Eirik Emil; Kristiansen, Lars; Skjold, Bjørnar; Bøhn, Thomas (Peer reviewed; Journal article, 2022)Salmon lice can impact the marine behaviour, growth, and survival of salmonids, but little is known about their effects on Arctic char. We present behavioural responses from the first dose-response experiment with wild ... -
Behavioural responses of wild anadromous Arctic char experimentally infested in situ with salmon lice
Strøm, John Fredrik; Bjørn, Pål Arne; Bygdnes, Eirik Emil; Kristiansen, Lars Amundsen; Skjold, Bjørnar; Bøhn, Thomas (Peer reviewed; Journal article, 2022)Salmon lice can impact the marine behaviour, growth, and survival of salmonids, but little is known about their effects on Arctic char. We present behavioural responses from the first dose-response experiment with wild ... -
Coastal salmon farms attract large and persistent aggregations of wild fish: an ecosystem effect
Dempster, Tim; Uglem, Ingebrigt; Sanchez-Jerez, P.; Fernandez-Jover, D.; Bayle-Sempere, J. T.; Nilsen, Rune; Bjørn, Pål Arne (Journal article; Peer reviewed, 2009-06-18)Coastal aquaculture is a globally expanding enterprise. Currently, 1200 salmon farms operate in coastal Norway, yet their capacity to aggregate and subsequently modify wild fish distributions is poorly known. Aggregations ... -
Disease interaction and pathogens exchange between wild and farmed fish populations with special reference to Norway
Johansen, Lill-Heidi; Jensen, Ingvill; Mikkelsen, Helene; Bjørn, Pål Arne; Jansen, P.A.; Bergh, Øivind (Journal article; Peer reviewed, 2011-05-21)Norway has the largest salmon-farming industry in the world, an industry that is still growing, and in recent years production of marine species like Atlantic cod has also increased. At the same time, Norway has the world's ... -
Efectos del piojo del salmón Lepeophtheirus salmonis(Copepoda: Caligidae) en las poblaciones de truchas (Salmo trutta) de la costa NE Atlántica
Lopez, Pablo Arachavala; Thorstad, Eva Bonsak; Todd, Christopher D.; Uglem, Ingebrigt; Bjørn, Pål Arne; Gargan, Patrick G.; Vollset, Knut Wiik; Halttunen, Elina; Kålås, Steinar; Berg, Marius; Finstad, Bengt (Peer reviewed; Journal article, 2015)Salmon lice are external parasites on salmonids in the marine environment. During recent years, sea lice abundance has been increased due to the presence of salmon farming using on-growing floating seas-cages. Amongst ... -
Effects of salmon lice infection on the behaviour of sea trout in the marine phase
Gjelland, Karl Øystein; Serra-Llinares, Rosa Maria; Hedger, Richard David; Arechavala-Lopez, Pablo; Nilsen, Rune; Finstad, Bengt; Uglem, Ingebrigt; Skilbrei, Ove; Bjørn, Pål Arne (Journal article; Peer reviewed, 2014-07-09)Salmon lice Lepeophtheirus salmonis Krøyer may affect survival and growth of anadromous salmonids through physiological stress and/or behavioural changes. Using acoustic telemetry tracking, we investigated the behaviour ... -
Effects of salmon lice Lepeophtheirus salmonis onwild sea trout Salmo trutta—a literature review
Thorstad, Eva Bonsak; Todd, Christopher D.; Uglem, Ingebrigt; Bjørn, Pål Arne; Gargan, Patrick G.; Vollset, Knut Wiik; Halttunen, Elina; Kålås, Steinar; Berg, Marius; Finstad, Bengt (Journal article; Peer reviewed, 2015-08-20)Salmon farming increases the abundance of salmon lice, which are ectoparasites of salmonids in the sea. Here we review the current knowledge on the effects of salmon lice on wild sea trout. Salmon lice feed on host mucus, ... -
Estimating the temporal overlap between post-smolt migration of Atlantic salmon and salmon lice infestation pressure from fish farms
Vollset, Knut Wiik; Barlaup, Bjørn Torgeir; Mahlum, Shad Kenneth; Bjørn, Pål Arne; Skilbrei, Ove Tommy (Journal article; Peer reviewed, 2016-09-01) -
Extent and ecological importance of escape through spawning in sea-cages for Atlantic cod
Uglem, Ingebrigt; Knutsen, Øyvind; Kjesbu, Olav Sigurd; Hansen, Øyvind J.; Mork, Jarle; Bjørn, Pål Arne; Varne, Rebekka; Nilsen, Rune; Ellingsen, Ingrid; Dempster, Tim (Journal article; Peer reviewed, 2012-11-14)The culture of certain fish species to sizes at which they can reproduce has led to the escape of fertilised eggs or ‘escape through spawning’. To investigate the extent and ecological importance of spawning in sea-cages ... -
Genetic analyses verify sexually mature escaped farmed Atlantic cod and farmed cod eggs in the natural environment
Jorde, Per Erik; van der Meeren, Terje; Quintela, Maria; Dahle, Geir; Mateos-Rivera, Alejandro; Aase, Marit; Norberg, Birgitta; Sævik, Pål Næverlid; Bjørn, Pål Arne; Glover, Kevin Alan (Dataset, 2024-03-07)Dataset for "Genetic analyses verify sexually mature escaped farmed Atlantic cod and farmed cod eggs in the natural environment" published in Evolutionary Applications, a Wiley journal. The information consists of an ... -
High connectivity of salmon farms revealed by aggregation, residence and repeated movements of wild fish among farms
Uglem, Ingebrigt; Dempster, Tim; Bjørn, Pål Arne; Sanchez-Jerez, P.; Økland, Finn (Journal article; Peer reviewed, 2009-05-29)Marine fish farms are widespread in coastal waters throughout the world, yet how they modify the movement patterns of wild fish species is largely unknown. We determined the spatio-temporal distribution of saithe Pollachius ... -
Hva avgjør lakselusinfeksjon hos vill laksefisk? Statistisk bearbeiding av data fra nasjonal lakselusovervåking, 2004-2010
Helland, Ingeborg Palm; Finstad, Bengt; Uglem, Ingebrigt; Diserud, Ola Håvard; Foldvik, Anders; Hanssen, Frank Ole; Bjørn, Pål Arne; Nilsen, Rune; Jansen, Peder A (NINA rapport, Research report, 2012)Norsk institutt for naturforskning (NINA) med samarbeidspartnere har siden 1992 samlet inn et omfattende datamateriale over lakseluspåslag hos vill laksefisk. Rapporteringen fra denne nasjonale lakselusovervåkinga har så ... -
Impacts of salmon lice on mortality, marine migration distance and premature return in sea trout
Serra Llinares, Rosa Maria; Bøhn, Thomas; Karlsen, Ørjan; Nilsen, Rune; Freitas, Carla; Albretsen, Jon; Haraldstad, Tormod; Thorstad, Eva Bonsak; Elvik, Kristine Marit Schrøder; Bjørn, Pål Arne (Peer reviewed; Journal article, 2020)Brown trout Salmo trutta (L.) is a facultative anadromous species, where a portion of individuals in populations with access to the sea perform migrations to use the richer feeding resources. We investigated the effect of ... -
Losing the 'arms race': Multiresistant salmon lice are dispersed throughout the North Atlantic Ocean
Fjørtoft, Helene Børretzen; Nilsen, Frank; Besnier, Francois; Stene, Anne; Tveten, Ann-Kristin; Bjørn, Pål Arne; Aspehaug, Vidar Teis; Glover, Kevin Alan (Peer reviewed; Journal article, 2021)Nothing lasts forever, including the effect of chemicals aimed to control pests in food production. As old pesticides have been compromised by emerging resistance, new ones have been introduced and turned the odds back in ... -
Micro- and macro-habitat selection of Atlantic salmon, (Salmo salar), post-smolts in relation to marine environmental cues
Jensen, Jenny Lovisa Alexandra; Strøm, John Fredrik; Nikolopoulos, Anna; Primicerio, Raul; Skardhamar, Jofrid; Atencio, Benjamin J.; Strand, Jo Espen Tau; Bjørn, Pål Arne; Bøhn, Thomas (Peer reviewed; Journal article, 2022)Atlantic salmon is an economically and culturally important species. The species encounters several natural and man-made threats during its migration between fresh water and the ocean, which in combination may explain its ... -
Micro- and macro-habitat selection of Atlantic salmon, Salmo salar, post-smolts in relation to marine environmental cues
Jensen, Jenny Lovisa Alexandra; Strøm, John Fredrik; Nikolopoulos, Anna; Primicerio, Raul; Skardhamar, Jofrid; Atencio, Benjamin J.; Strand, Jo Espen Tau; Bjørn, Pål Arne; Bøhn, Thomas (Peer reviewed; Journal article, 2022)Atlantic salmon is an economically and culturally important species. The species encounters several natural and man-made threats during its migration between fresh water and the ocean, which in combination may explain its ... -
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice
Halttunen, Elina; Gjelland, Karl Øystein; Glover, Kevin; Johnsen, Ingrid Askeland; Serra-Llinares, Rosa-Maria; Skaala, Øystein; Nilsen, Rune; Bjørn, Pål Arne; Karlsen, Ørjan; Finstad, Bengt; Skilbrei, Ove Tommy (Peer reviewed; Journal article, 2018)Understanding Atlantic salmon Salmo salar post-smolt coastal migration behaviour is crucial for predicting their exposure to ecological challenges such as the parasite salmon louse Lepeophtheirus salmonis. We compared the ...