Blar i Brage IMR på forfatter "Fjelldal, Per Gunnar"

Viser treff 41-60 av 101

    • Full production cycle performance of gene-edited, sterile Atlantic salmon - growth, smoltification, welfare indicators and fillet composition 

      Kleppe, Lene; Fjelldal, Per Gunnar; Andersson, Eva; Hansen, Tom Johnny; Sanden, Monica; Bruvik, Aina; Skaftnesmo, Kai Ove; Furmanek, Tomasz; Kjærner-Semb, Erik Nordtorp; Crespo, Diego; Flavell, Simon; Pedersen, Audun Østby; Vogelsang, Petra; Torsvik, Anja; Kvestad, Karen Anita; Olausson, Sara; Norberg, Birgitta; Schulz, Rüdiger W.; Bogerd, J.; Santi, N.; Edvardsen, Rolf Brudvik; Wargelius, Anna (Peer reviewed; Journal article, 2022)
      Using germ cell-free (GCF), sterile, dnd-knockout salmon for farming could solve the problems associated with precocious maturation and genetic introgression of farmed breeds into wild populations. However, prior to using ...

    • Første samlerapport: Velferd for triploid laks i Nord-Norge 

      Stien, Lars Helge; Sæther, Per Anton; Kristiansen, Tore S; Fjelldal, Per Gunnar; Sambraus, Florian (Rapport fra havforskningen;2019 - 47, Research report, 2019)
      Denne rapporten tar for seg velferden til 24 grupper av triploid laks satt ut i Nord-Norge 2014-2017. Noen av de tidlige smoltproduksjonene var kjennetegnet av lav eggkvalitet, sykdom eler andre problemer i settefiskfasen, ...

    • The genome sequence of the brown trout, Salmo trutta Linnaeus 1758 

      Hansen, Tom; Fjelldal, Per Gunnar; Lien, Sigbjørn; Smith, Michelle; Corton, Craig; Oliver, Karen; Skelton, Jason; Betteridge, Emma; Doulcan, Jale; Fedrigo, Oliver; Mountcastle, Jaquelyn; Jarvis, Erich; McCarthy, Shane A.; Chow, William; Howe, Kerstin; Torrance, James; Wood, Jonathan; Sims, Ying; Haggerty, Leanne; Challis, Richard; Threlfall, Jonathan; Mead, Daniel; Durbin, Richard; Blaxter, Mark (Peer reviewed; Journal article, 2021)
      We present a genome assembly from an individual female Salmo trutta (the brown trout; Chordata; Actinopteri; Salmoniformes; Salmonidae). The genome sequence is 2.37 gigabases in span. The majority of the assembly is ...

    • Growth and welfare of submerged Atlantic salmon under continuous lightning 

      Sievers, Michael; Korsøen, Øyvind Johan; Dempster, Timothy David; Fjelldal, Per Gunnar; Kristiansen, Tore S; Folkedal, Ole; Oppedal, Frode (Peer reviewed; Journal article, 2018)
      ABSTRACT: Although surface-based cages dominate the marine finfish aquaculture industry, production issues that arise at the surface such as poor environmental conditions and the presence of parasites has spurred interest ...

    • Hatching time and alevin growth prior to the onset of exogenous feeding in farmed, wild and hybrid Norwegian Atlantic salmon 

      Solberg, Monica Favnebøe; Fjelldal, Per Gunnar; Nilsen, Frank; Glover, Kevin (Journal article; Peer reviewed, 2014-12-01)

    • Heads and tails: The notochord develops differently in the cranium and caudal fin of Atlantic Salmon (Salmo salar, L.) 

      Kryvi, Harald; Nordvik, Kari; Fjelldal, Per Gunnar; Eilertsen, Mariann; Helvik, Jon Vidar; Støren, Eivind Wilhelm Nagel; Long, John H. (Peer reviewed; Journal article, 2020)
      While it is well known that the notochord of bony fishes changes over developmental time, less is known about how it varies across different body regions. In the development of the Atlantic salmon, Salmo salar L., cranial ...

    • Impact of Antioxidant Feed and Growth Manipulation on the Redox Regulation of Atlantic Salmon Smolts 

      Yin, Peng; Bjørnsson, Bjørn Thrandur; Fjelldal, Per Gunnar; Saito, Takaya; Remø, Sofie C.; Edvardsen, Rolf Brudvik; Hansen, Tom Johnny; Sharma, Sandeep; Olsen, Rolf Erik; Hamre, Kristin (Peer reviewed; Journal article, 2022)
      Accumulating evidence indicates a close relationship between oxidative stress and growth rate in fish. However, the underlying mechanisms of this relationship remain unclear. This study evaluated the combined effect of ...

    • In sea trout, the physiological response to salmon louse is stronger in female than in males 

      Fjelldal, Per Gunnar; Dalvin, Sussie Trine; Ugelvik, Mathias Stølen; Pedersen, Audun Østby; Hansen, Tom Johnny; Skjold, Bjørnar; Dyrhovden, Lise; Kroken, Ann-Kathrin Jakobsen; Karlsen, Ørjan (Peer reviewed; Journal article, 2023)
      The aims of this study were to compare male and female sea trout (Salmo trutta) with respect to their hypo-osmoregulatory ability over a simulated migration to seawater and their clinical and physiological response to ...

    • 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 (Journal article; Peer reviewed, 2018)
      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 unresolved in ...

    • Long term effects of smolt production strategy and early seawater phase rearing environment on mortality, growth, sexual maturation, and vertebra deformities in farmed Atlantic salmon (Salmo salar L.) 

      Myklatun, Lars Eirik; Fraser, Thomas; Fjelldal, Per Gunnar; Pedersen, Audun Østby; Hansen, Tom Johnny (Peer reviewed; Journal article, 2023)
      The life history of Atlantic salmon is plastic and determined by factors such as daylength and temperature. In aquaculture, artificial long days during smolt production maximize growth and allows for early sea-transfer, ...

    • Loss of stra8 Increases Germ Cell Apoptosis but Is Still Compatible With Sperm Production in Atlantic Salmon (Salmo salar) 

      Skaftnesmo, Kai Ove; Crespo, Diego; Kleppe, Lene; Andersson, Eva; Edvardsen, Rolf Brudvik; Norberg, Birgitta; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Schulz, Rüdiger W.; Wargelius, Anna (Peer reviewed; Journal article, 2021)
      Entering meiosis strictly depends on stimulated by retinoic acid 8 (Stra8) gene function in mammals. This gene is missing in a number of fish species, including medaka and zebrafish, but is present in the majority of fishes, ...

    • Mapping the pattern of essential neuroendocrine cells related to puberty and VA opsin expression provides further insight in the photoreceptive regulation of the BPG axis in Atlantic salmon (Salmo salar) 

      Horne, Christine; Helvik, Jon Vidar; Fleming, Mitchell Stewart; Fjelldal, Per Gunnar; Eilertsen, Mariann (Peer reviewed; Journal article, 2022)
      In Atlantic salmon (Salmo salar), seasonal photoperiod is shown to regulate the onset of sexual maturation, yet which brain region(s) is involved, and how light information impacts the neuroendocrine system are still not ...

    • Mineral nutrition and bone health in salmonids 

      Bæverfjord, Grete; Prabhu, P. Antony Jesu; Fjelldal, Per Gunnar; Albrektsen, Sissel; Hatlen, Bjarne; Denstadli, Vegard; Ytteborg, Elisabeth; Takle, Harald Rune; Lock, Erik-Jan; Berntssen, Marc; Lundebye, Anne-Katrine; Åsgård, Torbjørn Einar; Waagbø, Rune (Journal article; Peer reviewed, 2018)
      In the recent years, challenges faced in salmonid farming with regard to deformities have helped to improve our knowledge on skeletal biology and development of bone health in salmonids. Different nutritional, genetic and ...

    • Mineral nutrition and bone health in salmonids 

      Bæverfjord, Grete; Prabhu, P. Antony Jesu; Fjelldal, Per Gunnar; Albrektsen, Sissel; Hatlen, Bjarne; Denstadli, Vegard; Ytteborg, Elisabeth; Takle, Harald Rune; Lock, Erik-Jan; Berntssen, Marc; Lundebye, Anne-Katrine; Åsgård, Torbjørn Einar; Waagbø, Rune (Journal article; Peer reviewed, 2018)
      In the recent years, challenges faced in salmonid farming with regard to deformities have helped to improve our knowledge on skeletal biology and development of bone health in salmonids. Different nutritional, genetic and ...

    • MMP-13 (Matrix MetalloProteinase 13) expression might be an indicator for increased ECM remodeling and early signs of vertebral compression in farmed Atlantic salmon (Salmo salar L.) 

      Wargelius, Anna; Fjelldal, Per Gunnar; Grini, Ane; Gil-Martens, L.; Kvamme, Bjørn Olav; Hansen, Tom (Journal article; Peer reviewed, 2010-04)
      Vertebral body compression is a common problem in commercial farming of Atlantic salmon. Although risk factors, such as vaccination and alnutrition, have been identified, the etiology is largely unknown. Histological studies ...

    • No environmental effect on vaccine-induced reduced growth in Atlantic salmon Salmo salar smolts 

      Fraser, Thomas; Fjelldal, Per Gunnar; Sommerset, Ingunn; Søfteland, Tina; Høstmark, Ole; Powell, Mark; Heen, Vegar; Hansen, Tom Johnny (Peer reviewed; Journal article, 2020)
      Oil-adjuvanted vaccines reduce long-term growth in farmed Atlantic salmon Salmo salar, possibly via an increase in metabolic rate due to the energetic demands of the immune system. We tested this hypothesis by comparing ...

    • Ontogeny-Specific Skeletal Deformities in Atlantic Haddock Caused by Larval Oil Exposure 

      Olsvik, Pål Asgeir; Sørhus, Elin; Meier, Sonnich; Torvanger, Ingrid; Thorbjørnsen, Maja; Thorsen, Anders; Sørensen, Lisbet; Fjelldal, Per Gunnar; Karlsen, Ørjan; Guimaraes, Igo G.; Lie, Kai Kristoffer (Peer reviewed; Journal article, 2021)
      Bone deformities are one of the main effects of crude oil exposure in marine fish larvae. Craniofacial and jaw deformities, if severe enough, may restrict feeding and ultimately kill the developing larvae. This study aimed ...

    • Oppdrett av steril fisk 

      Hansen, Tom; Wargelius, Anna; Taranger, Geir Lasse; Fjelldal, Per Gunnar (Rapport fra Havforskningen;Nr. 18 - 2012, Working paper, 2012-04)
      I andre land og andre arter er det vanlig å bruke triploidisering og/eller oppdrett av monosexbesetninger (f.eks all female). I noen andre arter er det dessuten vanlig å bruke sterile hybrider til ulike typer formål. ...

    • Piscine orthoreovirus (PRV) in red and melanised foci in white muscle of Atlantic salmon (Salmo salar) 

      Bjørgen, Håvard; Wessel, Øystein; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Sveier, Harald; Sæbø, Håkon Rydland; Enger, Katrine Bones; Monsen, Erik; Kvellestad, Agnar Ståle; Rimstad, Espen; Koppang, Erling Olaf (Journal article; Peer reviewed, 2015)

    • Pituitary Gonadotropin Gene Expression During Induced Onset of Postsmolt Maturation in Male Atlantic Salmon: In Vivo and Tissue Culture Studies 

      Crespo, Diego; Skaftnesmo, Kai Ove; Kjærner-Semb, Erik Nordtorp; Yilmaz, Ozlem; Norberg, Birgitta; Olausson, Sara; Vogelsang, Petra; Bogerd, Jan; Kleppe, Lene; Edvardsen, Rolf Brudvik; Andersson, Eva; Wargelius, Anna; Hansen, Tom Johnny; Fjelldal, Per Gunnar; Schulz, Rüdiger W. (Peer reviewed; Journal article, 2022)
      Precocious male maturation causes reduced welfare and increased production costs in Atlantic salmon (Salmo salar) aquaculture. The pituitary produces and releases follicle-stimulating hormone (Fsh), the gonadotropin ...