Blar i Bergen Open Research Archive på forfatter "Wennevik, Vidar"
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Atlantic salmon and sea trout display synchronised smolt migration relative to linked environmental cues
Harvey, Alison C.; Glover, Kevin; Wennevik, Vidar; Skaala, Øystein (Journal article; Peer reviewed, 2020)Anadromous salmon and sea trout smolts face challenging migrations from freshwater to the marine environment characterised by high mortality. Therefore, the timing of smolt migration is likely to be critical for survival. ... -
Atlantic salmon populations reveal adaptive divergence of immune related genes - a duplicated genome under selection
Kjærner-Semb, Erik Nordtorp; Ayllon, Fernando; Furmanek, Tomasz; Wennevik, Vidar; Dahle, Geir; Niemelä, Eero; Ozerov, Mikhail; Vähä, Juha-Pekka; Glover, Kevin; Rubin, Carl J.; Wargelius, Anna; Edvardsen, Rolf (Peer reviewed; Journal article, 2016-08-11)Background: Populations of Atlantic salmon display highly significant genetic differences with unresolved molecular basis. These differences may result from separate postglacial colonization patterns, diversifying natural ... -
DNA and scale reading to identify repeat spawning in Atlantic salmon: Unique insights into patterns of iteroparity
Kaland, Håvard; Harvey, Alison C.; Skaala, Øystein; Wennevik, Vidar; Besnier, Francois; Andersen-Fjeldheim, Per Tommy; Knutar, Sofie; Andersen-Fjeldheim, Kaja Christine; Glover, Kevin Alan (Journal article; Peer reviewed, 2023)Iteroparity represents an important but often overlooked component of life history in anadromous Atlantic salmon. Here, we combined individual DNA profiling and scale reading to identify repeat spawners among ~8000 adult ... -
Domesticated escapees on the run: The second-generation monitoring programme reports the numbers and proportions of farmed Atlantic salmon in >200 Norwegian rivers annually
Glover, Kevin; Urdal, Kurt; Næsje, Tor; Skoglund, Helge; Florø-Larsen, Bjørn; Otterå, Håkon Magne; Fiske, Peder; Heino, Mikko Petteri; Aronsen, Tonje; Sægrov, Harald; Diserud, Ola Håvard; Barlaup, Bjørn Torgeir; Hindar, Kjetil; Bakke, Gunnar O; Solberg, Ingrid; Lo, Håvard; Solberg, Monica Favnebøe; Karlsson, Sten; Skaala, Øystein; Lamberg, Anders; Kanstad-Hanssen, Øyvind; Muladal, Rune; Skilbrei, Ove Tommy; Wennevik, Vidar (Peer reviewed; Journal article, 2019)Norway is the world’s largest producer of farmed Atlantic salmon and is home to ∼400 rivers containing wild salmon populations. Farmed escapees, a reoccurring challenge of all cage-based marine aquaculture, pose a threat ... -
The ecological profile of Atlantic salmon escapees entering a river throughout an entire season: Diverse in escape history and genetic background, but frequently virus-infected
Madhun, Abdullah Sami; Wennevik, Vidar; Karlsbakk, Egil; Skaala, Øystein; Fiksdal, Ingrid Uglenes; Meier, Sonnich; Tang, Yongkai; Glover, Kevin (Peer reviewed; Journal article, 2017-05)In 2014, 129 farmed salmon escapees captured in an upstream-migration trap located in the river Etne, western Norway, were investigated for viral infections, age at escape, size, and genetic composition. The frequency of ... -
The future looks like the past: Introgression of domesticated Atlantic salmon escapees in a risk assessment framework
Glover, Kevin; Wennevik, Vidar; Hindar, Kjetil; Skaala, Øystein; Fiske, Peder; Solberg, Monica Favnebøe; Diserud, Ola Håvard; Svåsand, Terje; Karlsson, Sten; Berg Andersen, Lasse; Grefsrud, Ellen Sofie (Journal article; Peer reviewed, 2020)Escapes of domesticated fish from aquaculture, followed by interbreeding with wild conspecifics, represent a threat to the genetic integrity and evolutionary trajectory of natural populations. Approximately fifty years of ... -
Genetic introgression of farmed salmon in native populations: quantifying the relative influence of population size and frequency of escapees
Heino, Mikko Petteri; Svåsand, Terje; Wennevik, Vidar; Glover, Kevin (Peer reviewed; Journal article, 2015-02-11)Farmed escapees may threaten the genetic integrity of native salmon populations through interbreeding. However, introgression requires survival until maturation, successful reproduction and successful early development. ... -
Genetic screening of farmed Atlantic salmon escapees demonstrates that triploid fish display reduced migration to freshwater
Glover, Kevin; Bos, J. B.; Urdal, Kurt; Madhun, Abdullah Sami; Sørvik, Anne Grete Eide; Unneland, Laila; Seliussen, Bjørghild Breistein; Skaala, Øystein; Skilbrei, Ove Tommy; Tang, Y.; Wennevik, Vidar (Peer reviewed; Journal article, 2016-05)Each year, hundreds of thousands of farmed Atlantic salmon escape from fish farms into the wild. Some of these escapees enter freshwater, and manage to interbreed with native populations. To hinder further genetic introgression ... -
Geographic distribution, abundance, diet, and body size of invasive pink salmon (Oncorhynchus gorbuscha) in the Norwegian and Barents Seas, and in Norwegian rivers
Diaz Pauli, Beatriz; Berntsen, Johan Henrik Hårdensson; Thorstad, Eva Bonsak; Homrum, Eydna í; Lusseau, Susan Mærsk; Wennevik, Vidar; Utne, Kjell Rong (Journal article; Peer reviewed, 2022)We report for the first time the geographic distribution, abundance, diet, and body size of invasive pink salmon (Oncorhynchus gorbuscha) in the Norwegian and Barents Seas and Norwegian coast and rivers. We found that pink ... -
Inferring Atlantic salmon post-smolt migration patterns using genetic assignment
Harvey, Alison C.; Sanchez, Maria Quintela; Glover, Kevin; Karlsen, Ørjan; Nilsen, Rune; Skaala, Øystein; Sægrov, Harald; Kolås, Steinar; Knutar, Sofie; Wennevik, Vidar (Peer reviewed; Journal article, 2019)Understanding migratory patterns is important for predicting and mitigating unwanted consequences of environmental change or anthropogenic challenges on vulnerable species. Wild Atlantic salmon undergo challenging migrations ... -
Investigating the frequency of triploid Atlantic salmon in wild Norwegian and Russian populations
Jørgensen, Katarina Mariann; Wennevik, Vidar; Sørvik, Anne Grete Eide; Unneland, Laila; Prusov, Sergey; Ayllon, Fernando; Glover, Kevin (Peer reviewed; Journal article, 2018-10-03)Background Fish may display variations in ploidy, including three sets of chromosomes, known as triploidy. A recent study revealed a frequency of ~ 2% spontaneous (i.e., non-intentional) triploidy in domesticated Atlantic ... -
Long-term monitoring of a brown trout (Salmo trutta) population reveals kin-associated migration patterns and contributions by resident trout to the anadromous run
Duval, Eloïse; Skaala, Øystein; Sanchez, Maria Quintela; Dahle, Geir; Delaval, Aurelien Nicolas; Wennevik, Vidar; Glover, Kevin Alan; Hansen, Michael Möller (Journal article; Peer reviewed, 2021)Background: In species showing partial migration, as is the case for many salmonid fishes, it is important to assess how anthropogenic pressure experienced by migrating individuals affects the total population. We focused ... -
Prevalence and genotypes of infectious salmon anaemia virus (ISAV) in returning wild Atlantic salmon (Salmo salar L.) in northern Norway
Madhun, Abdullah Sami; Mæhle, Stig; Wennevik, Vidar; Karlsbakk, Egil (Peer reviewed; Journal article, 2019-08) -
Prevalence of piscine orthoreovirus and salmonid alphavirus in sea-caught returning adult Atlantic salmon (Salmo salar L.) in northern Norway
Madhun, Abdullah Sami; Isachsen, Cecilie Helen; Omdal Strandenes, Linn Maren; Einen, Ann Cathrine B.; Mæhle, Stig; Wennevik, Vidar; Niemelä, Eero; Svåsand, Terje; Karlsbakk, Egil (Peer reviewed; Journal article, 2018-05)Heart and skeletal muscle inflammation (HSMI) caused by piscine orthoreovirus (PRV) and pancreas disease (PD) caused by salmonid alphavirus (SAV) are among the most prevalent viral diseases of Atlantic salmon farmed in ... -
Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild
Mahlum, Shad Kenneth; Skoglund, Helge; Wiers, Tore; Norman, Eirik; Barlaup, Bjørn Torgeir; Wennevik, Vidar; Glover, Kevin; Urdal, Kurt; Bakke, Gunnar O; Vollset, Knut (Peer reviewed; Journal article, 2019)Escaped 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 ... -
Timing is everything: Fishing-season placement may represent the most important angling-induced evolutionary pressure on Atlantic salmon populations
Harvey, Alison C.; Tang, Yongkai; Wennevik, Vidar; Skaala, Øystein; Glover, Kevin (Peer reviewed; Journal article, 2017)Fisheries-induced evolution can change the trajectory of wild fish populations by selectively targeting certain phenotypes. For important fish species like Atlantic salmon, this could have large implications for their ... -
The vgll3 Locus Controls Age at Maturity in Wild and Domesticated Atlantic Salmon(Salmo salar L.) Males
Ayllon, Fernando; Kjærner-Semb, Erik Nordtorp; Furmanek, Tomasz; Wennevik, Vidar; Solberg, Monica Favnebøe; Dahle, Geir; Taranger, Geir Lasse; Glover, Kevin; Sällman Almèn, Markus; Rubin, Carl J.; Edvardsen, Rolf; Wargelius, Anna (Peer reviewed; Journal article, 2015-11-09)Wild and domesticated Atlantic salmon males display large variation for sea age at sexual maturation, which varies between 1–5 years. Previous studies have uncovered a genetic predisposition for variation of age at maturity ...