Browsing Brage IMR by Author "Fjelldal, Per Gunnar"
Now showing items 1-20 of 115
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A new method for regionalization of the vertebral column in salmonids based on radiographic hallmarks
Murugesan, Sankar; Kryvi, Harald; Fraser, Thomas; Philip, Antony Jesu Prabhu; Remø, Sofie C.; Hansen, Tom Johnny; Witten, Paul Eckhard; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2024)Current procedures to establish vertebral column regionalization (e.g., histology) in fish are time consuming and difficult to apply. The aim of this study was to develop a more rapid and accurate radiology-based method ... -
Adaptive photoperiod interpretation modulates phenological timing in Atlantic salmon
Oldham, Tina Marie Wier; Oppedal, Frode; Fjelldal, Per Gunnar; Hansen, Tom Johnny (Peer reviewed; Journal article, 2023)Photoperiod, the portion of 24-h cycle during which an organism is exposed to illumination, is an important phenological cue in many animals. However, despite its influence on critical biological processes, there remain ... -
An industry-scale mass marking technique for tracing farmed fish escapees
Warren-Myers, Fletcher; Dempster, Tim; Fjelldal, Per Gunnar; Hansen, Tom; Swearer, Stephen E. (Journal article; Peer reviewed, 2015-03-04)Farmed fish escape and enter the environment with subsequent effects on wild populations. Reducing escapes requires the ability to trace individuals back to the point of escape, so that escape causes can be identified and ... -
An Industry-Scale Mass Marking Techniquefor Tracing Farmed Fish Escapees
Warren-Myers, Fletcher; Demster, Tim; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Swearer, Stephen E. (Journal article; Peer reviewed, 2015-03-04)Farmed fish escape and enter the environment with subsequent effects on wild populations. Reducing escapes requires the ability to trace individuals back to the point of escape, so that escape causes can be identified and ... -
Anatomical and pathological characteristics of ribs in the Atlantic salmon (Salmo salar L.) and its relevance to soft tissue changes
Brimsholm, Malin Helen; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Trangerud, Cathrine; Knutsen, Geir Magne; Asserson, Charlotte Finstad; Koppang, Erling Olaf; Bjørgen, Håvard (Peer reviewed; Journal article, 2023)Studies on the anatomical and pathological characteristics of ribs in farmed Atlantic salmon (Salmo salar L.) are warranted due to their possible association with red and melanized focal changes (RFC and MFC) in the fillet, ... -
Andre samlerapport: velferd for triploid laks i Nord-Norge - Sluttrapport, utsett 2018
Stien, Lars Helge; Sambraus, Florian; Sæther, Per Anton; Lind, Mattias Bendiksen; Kristiansen, Tore S; Nilsson, Jonatan; Fjelldal, Per Gunnar (Rapport fra havforskningen;2021 - 13, Research report, 2021)Denne rapporten tar for seg velferden til 8 grupper av triploid laks satt ut i Nord-Norge vår, sommer og høst 2018. Vårutsettene fikk varierende velferd og dødelighet. Dette skyltes i stor grad at disse fiskegruppene hadde ... -
Atlantic salmon (Salmo salar L.) post-smolts challenged two or nine weeks after seawater-transfer show differences in their susceptibility to salmonid alphavirus subtype 3 (SAV3)
Jarungsriapisit, Jiraporn; Moore, LJ; Taranger, Geir Lasse; Nilsen, T.O.; Morton, Hugh Craig; Fiksdal, Ingrid Uglenes; Stefansson, S.; Fjelldal, Per Gunnar; Evensen, Øystein; Patel, Sonal (Journal article; Peer reviewed, 2016-04-11) -
Atlantic salmon male post-smolt maturation can be reduced by using a 3-hour scotophase when inducing smoltification
Fraser, Thomas; Hansen, Tom Johnny; Norberg, Birgitta; Nilsen, Tom Ole; Schulz, Rüdiger W.; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2023)Photoperiod regulates the occurrence of unwanted male post-smolt maturation during the production of large (>100 g) Atlantic salmon (Salmo salar) smolts. However, the optimal daylength for triggering smoltification, but ... -
Auto-Adhesion Potential of Extraocular Aqp0 during Teleost Development
Chauvigné, Francois; Fjelldal, Per Gunnar; Cerdà, Joan; Finn, Roderick Nigel (Journal article; Peer reviewed, 2016-05-06)AQP0 water channels are the most abundant proteins expressed in the mammalian lens fiber membranes where they are essential for lens development and transparency. Unlike other aquaporin paralogs, mammalian AQP0 has a low ... -
Autosomal sdY pseudogenes explain discordances between phenotypic sex and DNA marker for sex identification in Atlantic salmon
Ayllon, Fernando; Solberg, Monica Favnebøe; Besnier, Francois; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Wargelius, Anna; Edvardsen, Rolf Brudvik; Glover, Kevin (Peer reviewed; Journal article, 2020)Despite the key role that sex-determination plays in evolutionary processes, it is still poorly understood in many species. In salmonids, which are among the best studied fishes, the master sex-determining gene sexually ... -
Beinhelse og fosforbehov i laks: Sluttrapport
Fjelldal, Per Gunnar; Albrektsen, Sissel; Witten, Eckhard; Fontanillas, Ramon; Nankervis, Leo; Thomsen, Tårn Helgøy; Breck, Olav (Rapport fra Havforskningen;Nr. 29-2014, Working paper, 2014-11) -
Changes in water temperature and oxygen: the effect of triploidy on performance and metabolism in large farmed Atlantic salmon
Sambraus, Florian; Remen, Mette; Olsen, Rolf Erik; Hansen, Tom Johnny; Waagbø, Rune; Torgersen, Thomas; Lock, Erik-Jan; Imsland, Albert; Fraser, Thomas W.K.; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2018) -
Chromosomal aberrations and early mortality in a non-mammalian vertebrate: example from pressure-induced triploid Atlantic salmon
Delaval, Aurelien Nicolas; Glover, Kevin Alan; Solberg, Monica Favnebøe; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Harvey, Alison C. (Peer reviewed; Journal article, 2024)In commercial aquaculture, the production of triploid fish is currently the most practical approach to prevent maturation and farm-to-wild introgression following escapes. However, triploids often exhibit poor welfare, and ... -
Chromosome aberrations in pressure-induced triploid Atlantic salmon
Glover, Kevin; Harvey, Alison C.; Hansen, Tom Johnny; Fjelldal, Per Gunnar; Besnier, Francois; Bos, J.B.; Ayllon, Fernando; Taggart, John B.; Solberg, Monica Favnebøe (Peer reviewed; Journal article, 2020)Triploid organisms have three sets of chromosomes. In Atlantic salmon, hydrostatic pressure treatment of newly fertilized eggs has been extensively used to produce triploids which are functionally sterile due to their ... -
Cloned and outbred Atlantic salmon display equal parasite dispersion when infected with the salmon louse
Glover, Kevin; Hansen, Tom Johnny; Besnier, Francois; Solberg, Monica Favnebøe; Fjelldal, Per Gunnar; Sørvik, Anne Grete Eide; Dalvin, Sussie; Nilsen, Frank (Peer reviewed; Journal article, 2017) -
Collagen type XI 1 may be involved in the structural plasticity of the vertebral coulm in Atlantic salmon (Salmo salar L.)
Wargelius, Anna; Fjelldal, Per Gunnar; Nordgarden, Ulla; Grini, Ane; Krossøy, B.; Grotmol, Sindre; Totland, Geir K.; Hansen, Tom (Journal article; Peer reviewed, 2010)Atlantic salmon (Salmo salar L.) vertebral bone displays plasticity in structure, osteoid secretion and mineralization in response to photoperiod. Other properties of the vertebral bone, such as mineral content and mechanical ... -
Collagen type XI 1 may be involved in the structural plasticity of the vertebral coulm in Atlantic salmon (Salmo salar L.)
Wargelius, Anna; Fjelldal, Per Gunnar; Nordgarden, Ulla; Grini, Ane; Krossøy, B.; Grotmol, Sindre; Totland, Geir K.; Hansen, Tom (Journal article; Peer reviewed, 2010)Atlantic salmon (Salmo salar L.) vertebral bone displays plasticity in structure, osteoid secretion and mineralization in response to photoperiod. Other properties of the vertebral bone, such as mineral content and mechanical ... -
Comparative analysis of IgM sub-variants in salmonid fish and identification of a residue in mu 3 which is essential for MAb4C10 reactivity
Kamil, Atif; Raae, Arnt Johan; Fjelldal, Per Gunnar; Koppang, Erling Olaf; Fladmark, Kari Espolin; Hordvik, Ivar (Journal article; Peer reviewed, 2013)In rainbow trout (Onchorhynchus mykiss) it has been shown that high affinity IgM antibodies havea higher degree of disulfide polymerization and a longer half life time. In the present study, distinct IgMsub-variants related ... -
Comparing physiological responses of acute and chronically stressed diploid and triploid Atlantic salmon (Salmo salar)
Madaro, Angelico; Lai, Floriana; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Gelebart, Virginie; Muren, Brynjar; Rønnestad, Ivar; Olsen, Rolf-Erik; Stien, Lars Helge (Peer reviewed; Journal article, 2024)We compared the performance and physiological response of diploid and triploid Atlantic salmon (Salmo salar) following 21 days of either unpredictable chronic stress (UCS) or no disturbance (control). Thereafter, all four ... -
A comparison of triploid and diploid Atlantic salmon (Salmo salar) performance and welfare under commercial farming conditions in Norway
Madaro, Angelico; Kjøglum, Sissel; Hansen, Tom Johnny; Fjelldal, Per Gunnar; Stien, Lars Helge (Peer reviewed; Journal article, 2021)Avoiding genetic interactions between wild and farmed Atlantic salmon is regarded as one of the major requirements for a sustainable salmon aquaculture industry. For this reason, farming functional sterile triploids has ...