Blar i Brage IMR 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 (Peer reviewed; Journal article, 2017) -
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 (Peer reviewed; Journal article, 2017) -
Biochemical composition of copepods for evaluation of feed quality in production of juvenile marine fish
van der Meeren, Terje; Olsen, Rolf Erik; Hamre, Kristin; Fyhn, Hans Jørgen (Journal article; Peer reviewed, 2007-12-13)To increase current knowledge on the nutritional value of natural prey organisms, the biochemical components of mainly three copepods (Acartia grani, Centropages hamatus, and Eurytemora affinis) from a marine pond system ... -
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 (Journal article; Peer reviewed, 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. ... -
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) -
The combined impact of plant-derived dietary ingredients and acute stress on the intestinal arachidonic acid cascade in Atlantic salmon (Salmo salar)
Oxley, Anthony; Jolly, Cecile; Eide, Torunn; Jordal, Ann-Elise O.; Svardal, Asbjørn Martin; Olsen, Rolf Erik (Journal article; Peer reviewed, 2010-03)A study was conducted to assess the effect of substituting high levels of dietary fish oil (FO) and fishmeal (FM) for vegetable oil (VO) and plant protein (PP) on the intestinal arachidonic acid (AA) cascade in the carnivorous ... -
The combined impact of plant-derived dietary ingredients and acute stress on the intestinal arachidonic acid cascade in Atlantic salmon (Salmo salar)
Oxley, Anthony; Jolly, Cecile; Eide, Torunn; Jordal, Ann-Elise O.; Svardal, Asbjørn Martin; Olsen, Rolf Erik (Journal article; Peer reviewed, 2010-03)A study was conducted to assess the effect of substituting high levels of dietary fish oil (FO) and fishmeal (FM) for vegetable oil (VO) and plant protein (PP) on the intestinal arachidonic acid (AA) cascade in the carnivorous ... -
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 (Journal article, 2016) -
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 ... -
Dødelighet av vårgytende sild etter trenging i not Rosfjorden i Vest-agder, 21.03 - 04.04.2011. Tokt 2011805
Vold, Aud; Isaksen, Bjørnar; Saltskår, Jostein; Tenningen, Maria; Totland, Bjørn; Aasen, Asbjørn; Olsen, Rolf Erik (Rapport fra Havforskningen;Nr. 10 - 2012, Working paper, 2012-03) -
Effect of temperature on the metabolism, behaviourand oxygen requirements of Sparus aurata
Remen, Mette; Olsen, Rolf Erik; Oppedal, Frode; Thorsheim, Grethe Beate; Folkedal, Ole; Sitjà-Bobadilla, Ariadna; Pérez-Sánchez, Jaume; Nederlof, Marit A. J. (Journal article; Peer reviewed, 2015-09-03)We investigated the effect of temperature on the limiting oxygen saturation (LOS) of gilthead sea bream Sparus aurata. This threshold was defined as the % O2 saturation where fish no longer upheld their routine metabolic ... -
Effects of cortisol on the intestinal mucosal immune response during cohabitant challenge with IPNV in Atlantic salmon (Salmo salar)
Niklasson, Lars; Sundh, Henrik; Olsen, Rolf Erik; Jutfelt, Fredrik; Skjødt, Karsten; Nilsen, Tom Ole; Sundell, Kristina (Journal article; Peer reviewed, 2014-05-08) -
Effects of Cortisol on the Intestinal Mucosal Immune Response during Cohabitant Challenge with IPNV in Atlantic Salmon (Salmo salar)
Niklasson, Lars; Sundh, Henrik; Olsen, Rolf Erik; Jutfelt, Fredrik; Skjødt, Karsten; Nilsen, Tom O.; Sundell, Kristian Snuttan (Journal article; Peer reviewed, 2014-05-08)Infectious pancreatic necrosis virus (IPNV) causes high incidence of disease in salmonids during the first period after SW transfer. During this period as well as during periods of stress, cortisol levels increase and ... -
Effects of photoperiod and melatonin implants on feed intake in Atlantic salmon (Salmo salar L.) postsmolts
Maiolo, Silvia; Hansen, Tom Johnny; Parisi, Giuliana; Olsen, Rolf Erik (Journal article; Peer reviewed, 2015-09-15)High melatonin concentrations were expected to negatively affect Atlantic salmon appetite. Hence, individually kept Atlantic salmon postsmolts were subjected to continuous light (24:0, L:L) or natural daylight (12:12, L:D) ... -
Effects of stunning methods on pre rigor changes in rainbow trout (Oncorhynchus mykiss) reared at two different temperatures
Concollato, Anna; Secci, Giulia; Zotte, Antonella Dalle; Vargas, Sheyla Cristina; Olsen, Rolf Erik; Lira de Medeiros, Adja Cristina; Parisi, Giuliana (Peer reviewed; Journal article, 2020)The effects of two stunning methods (carbon monoxide asphyxia, CO, and electroshock, E) on blood plasma parameters, rigor index, fillet pH and shape changes, ATP breakdown and Adenylate Energy Charge (AEC) in muscle ... -
Effects of vegetable feed ingredients on bone health in Atlantic salmon
Fjelldal, Per Gunnar; Nordgarden, Ulla; Wargelius, Anna; Taranger, Geir Lasse; Waagbø, Rune; Olsen, Rolf Erik (Journal article; Peer reviewed, 2010-04)The aim of the present study was to examine if dietary inclusion of vegetable lipids (VL) and proteins (VP) influenced markers of bone health in Atlantic salmon. Triplicate groups were fed one of four different diets; 100% ... -
Endogenous production of n-3 long-chain PUFA from first feeding and the influence of dietary linoleic acid and the α-linolenic:linoleic ratio in Atlantic salmon (Salmo salar)
Sprague, Matthew; Xu, Gong; Betancor, Monica B; Olsen, Rolf Erik; Torrissen, Ole; Glencross, Brett D.; Tocher, Douglas R. (Journal article; Peer reviewed, 2019)Atlantic salmon (Salmo salar) possess enzymes required for the endogenous biosynthesis of n-3 long-chain PUFA (LC-PUFA), EPA and DHA, from α-linolenic acid (ALA). Linoleic acid (LA) competes with ALA for LC-PUFA biosynthesis ... -
Fast currents reduce production performance of post-smolt Atlantic salmon.
Solstorm, Frida; Solstorm, David; Oppedal, Frode; Fernø, Anders; Fraser, Thomas; Olsen, Rolf Erik (Journal article; Peer reviewed, 2015-09-17)In the future, an increasing number of salmon farms may be located in areas with fast water current velocity due to limited availability of more sheltered locations. However, there is little information as to how fast ...