Browsing Bergen Open Research Archive by Author "Stefansson, Sigurd Olav"
Now showing items 1-16 of 16
-
Atlantic salmon post-smolts adapted for a longer time to seawater develop an effective humoral and cellular immune response against Salmonid alphavirus
Nuñez-Ortiz, Noelia; Moore, Lindsey; Jarungsriapisit, Jiraporn; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Morton, Hugh Craig; Taranger, Geir Lasse; Secombes, Christopher J.; Patel, Sonal (Peer reviewed; Journal article, 2018-11)Salmonid alphavirus (SAV) causes pancreas disease (PD) in Atlantic salmon (Salmo salar L.) and disease outbreaks are mainly detected after seawater transfer. The influence of the smoltification process on the immune ... -
The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens
Imsland, Albert; Roth, Bjørn; Fjelldal, Per Gunnar; Stefansson, Sigurd Olav; Handeland, Sigurd Olav; Mikalsen, Bjørn (Peer reviewed; Journal article, 2017-10)The aim of this study was to investigate the effect of continuous light of different duration, applied from late autumn to spring in the second year of the production cycle, on the production performance of Atlantic salmon ... -
Exposure to cold temperatures differentially modulates neural plasticity and stress responses in post-smolt Atlantic salmon (Salmo salar)
Tang, Patrik Anthony; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Gharbi, Naouel; Lai, Floriana; Tronci, Valentina; Vigo, Pablo Balseiro; Marnix, M.; Ebbesson, Lars O.E. (Journal article; Peer reviewed, 2022)The transfer success of farmed post-smolt Atlantic salmon (Salmo salar) to sea-cages rely on neural adaptions to promote stress resilience. As low temperatures impact physiology, this suggests that off-season transfer to ... -
Flesh quality of Atlantic salmon smolts reared at different temperatures and photoperiods
Imsland, Albert; Roth, Bjørn; Døskeland, Inge; Fjelldal, Per Gunnar; Stefansson, Sigurd Olav; Handeland, Sigurd O; Mikalsen, Bjørn (Peer reviewed; Journal article, 2019)Possible interactive effects of temperature and photoperiod on flesh quality in Atlantic salmon post‐smolts were studied. Juvenile (initial mean weight 96.0 g ± 3.1 SEM ) Atlantic salmon were reared at six different ... -
High fish density delays wound healing in Atlantic salmon (Salmo salar)
Sveen, Lene Rydal; Timmerhaus, Gerrit; Krasnov, Aleksei; Takle, Harald; Stefansson, Sigurd Olav; Handeland, Sigurd O; Ytteborg, Elisabeth (Peer reviewed; Journal article, 2018-11-15)In this study, we look closer at how high fish densities influence wound repair mechanisms in post-smolt Atlantic salmon. The fish were wounded with a 5 mm skin punch biopsy needle and stocked at two different densities, ... -
Impact of fish density and specific water flow on skin properties in Atlantic salmon (Salmo salar L.) post-smolts
Sveen, Lene Rydal; Timmerhaus, Gerrit; Torgersen, Jacob Seilø; Ytteborg, Elisabeth; Jørgensen, Sven Martin; Handeland, Sigurd Olav; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Calabrese, Sara; Ebbesson, Lars O.E.; Terjesen, Bendik Fyhn; Takle, Harald Rune (Peer reviewed; Journal article, 2016)Prolonged production of Atlantic salmon (Salmo salar) post-smolts in closed-containment systems has prompted research into biological requirements under higher production intensities. This study examined the effect of fish ... -
Increased Thermal Challenges Differentially Modulate Neural Plasticity and Stress Responses in Post-Smolt Atlantic Salmon (Salmo salar)
Tang, Patrik Anthony; Gharbi, Naouel; Nilsen, Tom Ole; Gorissen, M.; Stefansson, Sigurd Olav; Ebbesson, Lars O.E. (Journal article; Peer reviewed, 2022)The successful transfer of farmed post-smolt Atlantic salmon (Salmo salar) depends on proper stress responses and cognitive functions during the early seawater (SW) phase. However, with increasing summer oceanic temperatures, ... -
Interaction of temperature and feed ration on male postsmolt maturation of Atlantic salmon (Salmo salar L.)
Pino Martinez, Enrique; Balseiro Vigo, Pablo; Stefansson, Sigurd Olav; Kaneko, Nobuto; Norberg, Birgitta; Fleming, Mitchell Stewart; Imsland, Albert; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2023)Early maturation of Atlantic salmon male postsmolts is undesirable in aquaculture due to its negative impact on growth, welfare and seawater adaptation, however it is an increasing problem under intensive rearing conditions. ... -
Interaction of temperature and photoperiod on male postsmolt maturation of Atlantic salmon (Salmo salar L.)
Pino Martinez, Enrique; Balseiro Vigo, Pablo; Fleming, Mitchell Stewart; Stefansson, Sigurd Olav; Norberg, Birgitta; Imsland, Albert; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2023)Maturation of Atlantic salmon male postsmolts is a concern in aquaculture due to its increasing occurrence under intensive rearing conditions and its negative impact on growth, welfare and seawater readiness. The effect ... -
Investigation of growth performance of post-smolt Atlantic salmon (Salmo salar L.) in semi closed containment system: A big-scale benchmark study
Øvrebø, Tarald Kleppa; Vigo, Pablo Balseiro; Imsland, Albert; Stefansson, Sigurd Olav; Tveterås, Ragnar; Sveier, Harald; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2022)The Norwegian salmon industry faces challenges related to sea lice (Lepeophtheirus salmonis) infestations, escapees, diseases and environmental impact. Semi-closed containment systems (S-CCS) have been proposed to abate ... -
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation
Andersson, Eva; Denker, Elsa; Norberg, Birgitta; Schulz, Rüdiger W.; Olausson, Sara; Thorsen, Anders; Stefansson, Sigurd Olav; Imsland, Albert (Journal article; Peer reviewed, 2022)Lumpfish is the most important cleanerfish species in Atlantic salmon farming. Detailed information on the gonadal maturation process is a prerequisite for year-round production of juvenile lumpfish. In the present study ... -
Relationship between viral dose and outcome of infection in Atlantic salmon, Salmo salar L., post-smolts bath-challenged with salmonid alphavirus subtype 3
Jarungsriapisit, Jiraporn; Moore, Lindsey; Mæhle, Stig; Skår, Cecilie Kristin; Einen, Ann Cathrine B.; Fiksdal, Ingrid Uglenes; Morton, Hugh Craig; Stefansson, Sigurd Olav; Taranger, Geir Lasse; Patel, Sonal (Peer reviewed; Journal article, 2016-10-19)Salmonid alphavirus subtype 3 (SAV3) causes pancreas disease (PD) and adversely affects salmonid aquaculture in Europe. A better understanding of disease transmission is currently needed in order to manage PD outbreaks. ... -
Stocking density limits for post-smolt Atlantic salmon (Salmo salar L.) emphasis on production performance and welfare
Calabrese, Sara; Nilsen, Tom Ole; Kolarevic, Jelena; Ebbesson, Lars O.E.; Pinto Pedrosa, Cindy; Fivelstad, Sveinung; Hosfeld, Anne-Camilla Diesen; Stefansson, Sigurd Olav; Terjesen, Bendik Fyhn; Takle, Harald Rune; Martins, Catarina I.M.; Sveier, Harald; Mathisen, Frode; Imsland, Albert Kjartanson; Handeland, Sigurd Olav (Peer reviewed; Journal article, 2017-02)For the development of commercial scale semi-closed sea systems for farming post-smolt Atlantic salmon (Salmo salar), further knowledge is required on the interaction between fish density, farming conditions and fish ... -
Temperature and size-dependency of lumpfish (Cyclopterus lumpus) oxygen requirement and tolerance
Remen, Mette; Nes, Armand Moe; Hangstad, Thor Arne; Geraudie, Perrine; Reynolds, Patrick; Urskog, Tonje Cecilie; Hanssen, Anna; Stefansson, Sigurd Olav; Imsland, Albert (Journal article; Peer reviewed, 2022)Lumpfish are currently produced and utilized as cleaner fish, to control sea lice infestation rates in salmon net pens, but information on environmental requirements is still limited. This study aimed to determine the zone ... -
Triploid atlantic salmon (Salmo salar L.) postsmolts accumulate prevalence more slowly than diploid salmon following bath challenge with salmonid alphavirus subtype 3
Moore, Lindsey; Nilsen, Tom Ole; Jarungsriapisit, Jiraporn; Fjelldal, Per Gunnar; Stefansson, Sigurd Olav; Taranger, Geir Lasse; Patel, Sonal (Peer reviewed; Journal article, 2017-04-12)Triploid Atlantic salmon (Salmo salar L.) may play an important role in the sustainable expansion of the Norwegian aquaculture industry. Therefore, the susceptibility of triploid salmon to common infections such as salmonid ... -
The use of photoperiods to provide year round spawning in lumpfish Cyclopterus lumpus
Imsland, Albert; Hangstad, Thor Arne; Jonassen, Thor Magne; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Hovgaard, Peter; Elvegård, Tor Anders; Lindberg, Ken Ståle; Mikalsen, Bjørn; Urskog, Tonje Cecilie; Norberg, Birgitta; Andersson, Eva; Spetland, Frank; Reynolds, Patrick (Peer reviewed; Journal article, 2019)In order to provide year round spawning broodstock, lumpfish (initial size 746 g and 24.9 cm) were reared under four different photoperiod regimes from January 2017 to July 2018. One group was reared under simulated natural ...