Browsing Bergen Open Research Archive by Author "Glover, Kevin"
Now showing items 41-60 of 61
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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 ... -
Judging a salmon by its spots: Environmental variation is the primary determinant of spot patterns in Salmo salar
Jørgensen, Katarina Mariann; Solberg, Monica Favnebøe; Besnier, Francois; Thorsen, Anders; Fjelldal, Per Gunnar; Skaala, Øystein; Malde, Ketil; Glover, Kevin (Peer reviewed; Journal article, 2018-04-12)Background. In fish, morphological colour changes occur from variations in pigment concentrations and in the morphology, density, and distribution of chromatophores in the skin. However, the underlying mechanisms remain ... -
The mechanism (Phe362Tyr mutation) behind resistance in Lepeophtheirus salmonis pre-dates organophosphate use in salmon farming
Kaur, Kiranpreet; Besnier, Francois; Glover, Kevin; Nilsen, Frank; Aspehaug, Vidar Teis; Fjørtoft, Helene Børretzen; Horsberg, Tor Einar (Peer reviewed; Journal article, 2017-09-27)The salmon louse is an ectoparasitic copepod of salmonids in the marine environment, and represents a global challenge to salmon aquaculture. A major issue is the reliance of the industry on a limited number of chemicals ... -
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 ... -
Modeling fitness changes in wild Atlantic salmon populations faced by spawning intrusion of domesticated escapees
Castellani, Marco; Heino, Mikko Petteri; Gilbey, John; Araki, Hitoshi; Svåsand, Terje; Glover, Kevin (Peer reviewed; Journal article, 2018-07)Genetic interaction between domesticated escapees and wild conspecifics represents a persistent challenge to an environmentally sustainable Atlantic salmon aquaculture industry. We used a recently developed eco‐genetic ... -
Pacific and Atlantic Lepeophtheirus salmonis (Krøyer, 1838) are allopatric subspecies: Lepeophtheirus salmonis salmonis and L. salmonis oncorhynchi subspecies novo
Skern-Mauritzen, Rasmus; Torrissen, Ole; Glover, Kevin (Peer reviewed; Journal article, 2014-03-14)Background: The salmon louse Lepeophtheirus salmonis is a parasitic copepod that infects salmonids in the Pacific and Atlantic oceans. Although considered as a single species, morphological and biological differences have ... -
The pantophysin gene and its relationship with survival in early life stages of Atlantic cod: Pantophysin in Atlantic cod
Otterå, Håkon Magne; Johansen, Torild; Folkvord, Arild; Dahle, Geir; Bingh, Marte Kristine Solvang; Westgaard, Jon-Ivar; Glover, Kevin (Journal article; Peer reviewed, 2020)Genetic markers are widely used in fisheries management around the world. While the genetic structure and markers selected are usually based on samples from the wild, very few controlled experiments have been carried out ... -
A pedigree-based experiment reveals variation in salinity and thermal tolerance in the salmon louse, Lepeophtheirus salmonis
Ljungfeldt, Lina; Sanchez, Maria Quintela; Besnier, Francois; Nilsen, Frank; Glover, Kevin (Peer reviewed; Journal article, 2017-12)The salmon louse is a highly abundant ectoparasitic copepod of salmonids in the North Pacific and Atlantic. Widespread and rapid development of resistance to chemical agents used to delouse salmonids on marine farms is now ... -
The Phe362Tyr mutation conveying resistance to organophosphates occurs in high frequencies in salmon lice collected from wild salmon and trout
Fjørtoft, Helene Børretzen; Besnier, Francois; Stene, Anne; Nilsen, Frank; Bjørn, Pål Arne; Tveten, Ann-Kristin; Finstad, Bengt; Aspehaug, Vidar; Glover, Kevin (Peer reviewed; Journal article, 2017-10-27)The parasitic salmon louse, and its resistance to chemical delousing agents, represents one of the largest challenges to the salmon aquaculture industry. We genotyped lice sampled from wild salmon and sea trout throughout ... -
Ploidy elicits a whole-genome dosage effect: growth of triploid Atlantic salmon is linked to the genetic origin of the second maternal chromosome set
Harvey, Alison C.; Fjelldal, Per Gunnar; Solberg, Monica Favnebøe; Hansen, Tom Johnny; Glover, Kevin (Peer reviewed; Journal article, 2017-04-11)Background: The Atlantic salmon aquaculture industry is investigating the feasibility of using sterile triploids to mitigate genetic interactions with wild conspecifics, however, studies investigating diploid and triploid ... -
Production and verification of the first Atlantic salmon (Salmo salar L.) clonal lines
Hansen, Tom Johnny; Penman, David J.; Glover, Kevin; Fraser, Thomas; Vågseth, Tone; Thorsen, Anders; Sørvik, Anne Grete Eide; Fjelldal, Per Gunnar (Journal article; Peer reviewed, 2020)Background In several fish species homozygous and heterozygous clonal lines have been produced using gynogenetic and androgenetic techniques. These lines are standardized and can be reproduced over generations. In rainbow ... -
“Real-time” genetic monitoring of a commercial fishery on the doorstep of an MPA reveals unique insights into the interaction between coastal and migratory forms of the Atlantic cod
Johansen, Torild; Westgaard, Jon-Ivar; Seliussen, Bjørghild Breistein; Nedreaas, Kjell Harald; Dahle, Geir; Glover, Kevin; Kvalsund, Roger; Aglen, Asgeir (Peer reviewed; Journal article, 2017-05)With the decline of many of the world’s fisheries, increased regulation, including marine protected areas (MPA), forms an increasingly important role in promoting sustainable resource use. Here, we present a novel “real-time” ... -
Salmon lice sampled from wild Atlantic salmon and sea trout throughout Norway display high frequencies of the genotype Associated with pyrethroid resistance
Fjørtoft, Helene Børretzen; Nilsen, Frank; Besnier, Francois; Stene, Anne; Bjørn, Pål Arne; Tveten, Ann-Kristin; Aspehaug, Vidar Teis; Finstad, Bengt; Glover, Kevin (Peer reviewed; Journal article, 2019)Atlantic salmon Salmo salar aquaculture is based on the use of open-pen sea cages, with the consequence that farmed fish are both recipients and sources of pathogens from surrounding waters. Currently, the parasitic salmon ... -
Sequence variation in four mitochondrial genes of the salmon louse Lepeophtheirus salmonis
Tjensvoll, Kjersti; Glover, Kevin; Nylund, Are (Peer reviewed; Journal article, 2006-03-02)A total of 210 Lepeophtheirus salmonis collected from 7 locations (Scotland, Russia, Canada, Japan and 3 locations in Norway), were screened for sequence variation in 4 mitochondrial genes; ATPase subunit 6 (A6), Cytochrome ... -
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 ... -
Thermal plasticity in farmed, wild and hybrid Atlantic salmon during early development: Has domestication caused divergence in low temperature tolerance?
Solberg, Monica Favnebøe; Dyrhovden, Lise; Matre, Ivar Helge; Glover, Kevin (Peer reviewed; Journal article, 2016-02-16)Background: In the past three decades, millions of domesticated Atlantic salmon Salmo salar L. have escaped from farms into the wild. Their offspring display reduced survival in the natural environment, which demonstrates ... -
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 ... -
A transcriptomic analysis of diploid and triploid Atlantic salmon lenses with and without cataracts
Olsvik, Pål Asgeir; Finn, Roderick Nigel; Remø, Sofie C.; Fjelldal, Per Gunnar; Chauvigné, Francois; Glover, Kevin; Hansen, Tom Johnny; Waagbø, Rune (Journal article; Peer reviewed, 2020)To avoid negative environmental impacts of escapees and potential inter-breeding with wild populations, the Atlantic salmon farming industry has and continues to extensively test triploid fish that are sterile. However, ... -
Transcriptomic comparison of communally reared wild, domesticated and hybrid Atlantic salmon fry under stress and control conditions
Bicskei, Beatrix; Taggart, John B.; Bron, James E.; Glover, Kevin (Journal article; Peer reviewed, 2020)Background Domestication is the process by which organisms become adapted to the human-controlled environment. Since the selection pressures that act upon cultured and natural populations differ, adaptations that favour ... -
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 ...