Blar i NTNU Open på forfatter "Olsen, Rolf Erik"
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A comparative study of diploid versus triploid Atlantic salmon (Salmo salar L.). The effects of rearing temperatures (5, 10 and 15 °C) on raw material characteristics and storage quality
Lerfall, Jørgen; Hasli, Pål Rune; Skare, Even Flønes; Olsen, Rolf Erik; Rotabakk, Bjørn Tore; Roth, Bjørn; Slinde, Erik; Egelandsdal, Bjørg Tordis (Journal article; Peer reviewed, 2017)Several major market operators argue that the current level of knowledge about quality is too scant to justify a switch to a large-scale production of triploid salmon. The aim of the present study was, therefore, to elucidate ... -
A comparative study of the physiological responses of chronically stressed diploid and triploid Atlantic salmon (Salmo salar)
Muren, Brynjar (Master thesis, 2022)Rømt oppdrettslaks (Salmo salar) regnes for å være en av de største truslene som påføres ville populasjoner av Atlantisk laks grunnet introgressiv hybridisering. Dette kan unngås ved å indusere sterilitet i oppdrettslaksen, ... -
A Crude Awakening: Effects of Crude Oil on Lipid Metabolism in Calanoid Copepods Terminating Diapause
Skottene, Elise; Tarrant, Ann; Olsen, Anders; Altin, Dag; Hansen, Bjørn Henrik; Choquet, Marvin; Olsen, Rolf Erik; Jenssen, Bjørn Munro (Journal article; Peer reviewed, 2019)Calanus finmarchicus and Calanus glacialis are keystone zooplankton species in North Atlantic and Arctic marine ecosystems because they form a link in the trophic transfer of nutritious lipids from phytoplankton to predators ... -
A systemic study of lipid metabolism regulation in salmon fingerlings and early juveniles fed plant oil
Jin, Yang; Olsen, Rolf Erik; Gillard, Gareth B.; Østensen, Mari-Ann; Korsvoll, Sven A.; Santi, Nina; Vik, Jon Olav; Sandve, Simen Rød; Olsen, Yngvar (Journal article; Peer reviewed, 2018)In salmon farming, the scarcity of fish oil has driven a shift towards the use of plant-based oil from vegetable or seed, leading to fish feed low in long-chain PUFA (LC-PUFA) and cholesterol. Atlantic salmon has the ... -
Acute stress response on Atlantic salmon: a time-course study of the effects on plasma metabolites, mucus cortisol levels, and head kidney transcriptome profile
Madaro, Angelico; Nilsson, Jonatan; Whatmore, Paul; Roh, HyeongJin; Grove, Søren; Stien, Lars Helge; Olsen, Rolf Erik (Peer reviewed; Journal article, 2022)Farmed Atlantic salmon (Salmo salar) welfare and performance can be strongly influenced by stress episodes caused by handling during farming practices. To better understand the changes occurring after an acute stress ... -
An oil containing EPA and DHA from transgenic Camelina sativa to replace marine fish oil in feeds for Atlantic salmon (Salmo salar L.): Effects on intestinal transcriptome, histology, tissue fatty acid profiles and plasma biochemistry
Betancor, Monica B; Li, Keshuai; Sprague, Matthew; Bardal, Tora; Sayanova, Olga; Usher, Sarah; Han, Lihua; Måsøval, Kjell; Torrissen, Ole; Napier, Johnathan; Tocher, Douglas R.; Olsen, Rolf Erik (Journal article; Peer reviewed, 2017)New de novo sources of omega 3 (n-3) long chain polyunsaturated fatty acids (LC-PUFA) are required as alternatives to fish oil in aquafeeds in order to maintain adequate levels of the beneficial fatty acids, eicosapentaenoic ... -
Anti-biofilm properties and immunological response of an immune molecule lectin isolated from shrimp Metapenaeus monoceros
Preetham, Elumalai; Rubeena, Abdul Salam; Vaseeharan, Baskaralingam; Chaurasia, Mukesh Kumar; Arockiaraj, Jesu; Olsen, Rolf Erik (Journal article; Peer reviewed, 2019)The study is carried out to understand the antimicrobial and immunological response of a potential immune molecule lectin, MmLec isolated from haemolymph of Speckled shrimp, Metapenaeus monoceros. MmLec was purified using ... -
Assessment of the risk of negative impact on biodiversity from import and release of eggs or live fish from landlocked Atlantic salmon from Klarälven in Sweden to Trysilelva in Norway. Scientific Opinion of the Panel on Alien Organisms and Trade in Endangered Species of the Norwegian Scientific Committee for Food and Environment
Thorstad, Eva Bonsak; Garseth, Åse Helen; Gjøen, Tor; Gulla, Snorre; Lo, Håvard; Malmstrøm, Martin; Mo, Tor Atle; Velle, Gaute; de Boer, Hugo; Eldegard, Katrine; Hindar, Kjetil; Hole, Lars Robert; Järnegren, Johanna; Kausrud, Kyrre; Kirkendall, Lawrence R.; Måren, Inger Elisabeth; Nilsen, Erlend Birkeland; Olsen, Rolf Erik; Rimstad, Espen; Rueness, Eli Knispel; Øverli, Øyvind; Nielsen, Andreas (VKM Report;, Research report, 2021) -
Assessment of the risk of negative impact on biodiversity from import and release of eggs or live fish from landlocked Atlantic salmon from Klarälven in Sweden to Trysilelva in Norway. Scientific Opinion of the Panel on Alien Organisms and Trade in Endangered Species of the Norwegian Scientific Committee for Food and Environment
Thorstad, Eva Bonsak; Garseth, Åse Helen; Gjøen, Tor; Gulla, Snorre; Lo, Håvard; Malmstrøm, Martin; Mo, Tor Atle; Velle, Gaute; de Boer, Hugo; Eldegard, Katrine; Hindar, Kjetil; Hole, Lars Robert; Järnegren, Johanna; Kausrud, Kyrre; Kirkendall, Lawrence R.; Måren, Inger Elisabeth; Nilsen, Erlend Birkeland; Olsen, Rolf Erik; Rimstad, Espen; Rueness, Eli Knispel; Øverli, Øyvind; Nielsen, Anders (Peer reviewed; Journal article, 2021)Introduction Atlantic salmon in the River Klarälven in Sweden live the entire life in freshwater, undertaking feeding migrations to Lake Vänern. The upper part of the watershed is in Norway and comprises the River Trysilelva ... -
Bakgrunnsnivåer av hydrogensulfid i RAS, produksjon av hydrogensulfid fra fiskeslam ved ulike saliniteter, og effekten av å tilsette nitrat
Langeteig, Simen (Master thesis, 2019)De siste årene har det forekommet et økende antall hendelser med hydrogensulfid (H2S) ved norske settefiskanlegg som har ført til stor fiskedød. Oppdretterne har valgt å produsere større deler av biomassen på land, i ... -
Can mesopelagic mixed layers be used as feed source for salmon aquaculture?
Olsen, Rolf Erik; Strand, Espen; Melle, Webjørn Raunsgård; Nørstebø, Jo Trelvik; Lall, Santosh P.; Tocher, Douglas R.; Sprague, Matthew (Peer reviewed; Journal article, 2019)Salmon aquaculture is in great need of good quality balanced protein and lipid sources, particularly marine omega-3 (n-3) long-chain polyunsaturated fatty acids (LC-PUFA), to sustain a further development of the industry. ... -
Can mesopelagic mixed layers be used as feed sources for salmon aquaculture?
Olsen, Rolf Erik; Strand, E.; Melle, Webjørn; Nørstebø, Jo Trelvik; Lall, Santos P.; Ringø, Einar; Tocher, Douglas R.; Sprague, M. (Journal article; Peer reviewed, 2020)Salmon aquaculture is in great need of good quality balanced protein and lipid sources, particularly marine omega-3 (n-3) long-chain polyunsaturated fatty acids (LC-PUFA), to sustain a further development of the industry. ... -
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 (Journal article; Peer reviewed, 2018)In salmon farming, the use of sterile triploids (3N) can mitigate the problem of escapees interbreeding with wild salmon. However, triploid salmon appear less tolerant to high water temperatures and low oxygen levels ... -
Characterization of mitochondrial respiration in Atlantic salmon (Salmo salar) fed with glutamate and succinate enhanced diet
Manoharan, Naveenan (Master thesis, 2018)The smolt stage of salmon has challenges in reaching adequate growth rates due to the changing environmental conditions at sea. Therefore, it is necessary to provide adequate diets to achieve sufficient growth. The present ... -
Chicken hydrolysate as an alternative feed ingredient for Atlantic salmon (Salmo salar) - effects on growth, feed intake, digestibility and intestinal health
Boine Brokvam, Celine (Master thesis, 2023)Dette forsøket undersøkte effekten av å gi formulert fôr til postsmolt av atlantisk laks (Salmo salar) der 22% og 64% av fiskemelet ble byttet ut med henholdsvis 5% og 15% kyllinghydrolysat. Kyllinghydrolysatet inneholdt ... -
Comparative transcriptomics reveals domestication‐associated features of Atlantic salmon lipid metabolism
Jin, Yang; Olsen, Rolf Erik; Harvey, Thomas Nelson; Østensen, Mari-Ann; Li, Keshuai; Santi, Nina; Vadstein, Olav; Bones, Atle M.; Vik, Jon Olav; Sandve, Simen Rød; Olsen, Yngvar (Peer reviewed; Journal article, 2020)Domestication of animals imposes strong targeted selection for desired traits but can also result in unintended selection due to new domestic environments. Atlantic salmon was domesticated in the 1970s and has subsequently ... -
Coping with a changing environment: The effects of early life stress
Vindas, Marco Antonio; Madaro, Angelico; Fraser, Thomas; Höglund, Erik; Olsen, Rolf Erik; Øverli, Øyvind; Kristiansen, Tore S (Peer reviewed; Journal article, 2016)Ongoing rapid domestication of Atlantic salmon implies that individuals are subjected to evolutionarily novel stressors encountered under conditions of artificial rearing, requiring new levels and directions of flexibility ... -
CRISPR/Cas9-mediated ablation of elovl2 in Atlantic salmon (Salmo salar L.) inhibits elongation of polyunsaturated fatty acids and induces Srebp-1 and target genes
Winge, Per; Datsomor, Alex; Olsen, Rolf Erik; Jin, Yang; Vik, Jon Olav; Edvardsen, Rolf; Grammes, Fabian; Wargelius, Anna; Li, Keshuai (Journal article; Peer reviewed, 2019)Atlantic salmon can synthesize polyunsaturated fatty acids (PUFAs), such as eicosapentaenoic acid (20:5n-3), arachidonic acid (20:4n-6) and docosahexaenoic acid (22:6n-3) via activities of very long chain fatty acyl elongases ... -
CRISPR/Cas9-mediated editing of Δ5 and Δ6 desaturases impairs Δ8-desaturation and docosahexaenoic acid synthesis in Atlantic salmon (Salmo salar L.)
Datsomor, Alex Kojo; Olsen, Rolf Erik; Madaro, Angelico; Bones, Atle M.; Edvardsen, Rolf Brudvik; Wargelius, Anna; Winge, Per (Journal article; Peer reviewed, 2019)The in vivo functions of Atlantic salmon fatty acyl desaturases (fads2), Δ6fads2-a, Δ6fads2-b, Δ6fads2-c and Δ5fads2 in long chain polyunsaturated fatty acid (LC-PUFA) synthesis in salmon and fish in general remains to be ... -
Design av nedsenkbar merd i stål
Fjærtoft, Edvard; Nes, Mikkel Gjerde (Bachelor thesis, 2023)Bacheloroppgaven forsøker å løse det omfattende lakselusproblemet i dagens fiskeoppdrettsindustri ved å designe en nedsenkbar stålmerd som kan tåle miljølastene og redusere miljøpåvirkningen fra lakseproduksjonen. Nedsenkbare ...