Browsing Bergen Open Research Archive by Author "Handeland, Sigurd Olav"
Now showing items 1-16 of 16
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Acoustic Delicing of Atlantic Salmon (Salmo salar): Fish Welfare and Salmon Lice (Lepeophtheirus salmonis) Dynamics
Hjelle, Bibbi Maria Kallay; Imsland, Albert; Vigo, Pablo Balseiro; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2022)Acoustic lice treatment (AcuLice) is a newly developed system, which uses a composite acoustic sound image with low-frequency sound to remove salmon lice (Lepeophtheirus salmonis) from Atlantic salmon (Salmo salar). This ... -
Changes in circulating insulin-like growth factor-1 and its binding proteins in yearling rainbow trout during spring under natural and manipulated photoperiods and their relationships with gill Na+, K+-ATPase and body size
Cui, Wenda; Takahashi, Eisuke; Morro, Bernat; Vigo, Pablo Balseiro; Albalat, Amaya; Pinto Pedrosa, Cindy; Mackenzie, Simon A.; Nilsen, Tom Ole; Sveier, Harald; Ebbesson, Lars O.E.; Handeland, Sigurd Olav; Shimizu, Munetaka (Journal article; Peer reviewed, 2022)Smoltification in salmonids occurs during spring in response to increasing photoperiod to prepare for marine life. Smoltification is associated with increased hypo-osmoregulatory ability and enhanced growth potential, ... -
A comparative study on quality, shelf life and sensory attributes of Atlantic salmon slaughtered on board slaughter vessels against traditional land-based facilities
Skare, Maren; Chan, Sherry Stephanie; Handeland, Sigurd Olav; Løvdal, Trond; Lerfall, Jørgen; Roth, Bjørn (Journal article; Peer reviewed, 2021)The purpose of this study was to investigate the shelf life and quality of Atlantic salmon (Salmo salar) slaughtered onboard vessels and shipped to Denmark in −0.8 °C refrigerated seawater (RSW) as compared to traditional ... -
Constant High Temperature Promotes Early Changes in Testis Development Associated with Sexual Maturation in Male Atlantic Salmon (Salmo salar L.) Post-Smolts
Pino Martinez, Enrique; Braanaas, Markus; Balseiro Vigo, Pablo; Kraugerud, Marianne; Pinto Pedrosa, Cindy; Imsland, Albert; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2022)Sexual maturation of post-smolts is a concern for Atlantic salmon producers, and its occurrence is dependent upon factors such as water temperature and energy availability, among others. The present study was designed to ... -
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 ... -
Effect of Photoperiod and Transfer Time on Atlantic Salmon Smolt Quality and Growth in Freshwater and Seawater Aquaculture Systems
Pino Martinez, Enrique; Imsland, Albert; Hosfeld, Anne-Camilla Diesen; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2023)Smoltification is a key process in Atlantic salmon aquaculture, given it prepares the fish for a successful transit from fresh to seawater. However, industry players have not yet reached a consensus on the best protocols ... -
The effect of photoperiod manipulation on Atlantic salmon growth, smoltification and sexual maturation: A case study of a commercial RAS
Pino, Enrique; Balseiro Vigo, Pablo; Pedrosa, Cindy; Haugen, Tilde; Fleming, Mitchell Stewart; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2021)The effect of photoperiod manipulation on growth, smoltification and maturation was assessed in Atlantic salmon through an observational study performed in a commercial RAS facility from June (25.0 ± 11.0 g) to October ... -
Effects of short term fasting on mRNA expression of ghrelin and the peptide transporters PepT1 and 2 in Atlantic salmon (Salmo salar)
Del Vecchio, Gianmarco; Lai, Floriana; Gomes, Ana S.; Verri, Tiziano; Kalananthan, Tharmini; Barca, Amilcare; Handeland, Sigurd Olav; Rønnestad, Ivar (Journal article; Peer reviewed, 2021)Food intake is a vital process that supplies necessary energy and essential nutrients to the body. Information regarding luminal composition in the gastrointestinal tract (GIT) collected through mechanical and nutrient ... -
Endoplasmic reticulum stress as a key mechanism in stunted growth of seawater rainbow trout (Oncorhynchus mykiss)
Morro, Bernat; Broughton, Richard; Vigo, Pablo Balseiro; Handeland, Sigurd Olav; Mackenzie, Simon A.; Doherty, Mary K.; Whitfield, Phillip D.; Shimizu, Munetaka; Gorissen, Marnix; Sveier, Harald; Albalat, Amaya (Journal article; Peer reviewed, 2021)Background Rainbow trout (Oncorhynchus mykiss) is a salmonid species with a complex life-history. Wild populations are naturally divided into freshwater residents and sea-run migrants. Migrants undergo an energy-demanding ... -
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 ... -
Impact of long-term fasting on the stomach-hypothalamus appetite regulating genes in Atlantic salmon postsmolts
Kalananthan, Tharmini; Folkedal, Ole; Gomes, Ana S.; Lai, Floriana; Handeland, Sigurd Olav; Tolås, Ingvill; Gelebart, Virginie; Rønnestad, Ivar (Journal article; Peer reviewed, 2023)Atlantic salmon will experience periods of fasting during its lifecycle. In nature, prolonged fasting periods occur owing to seasonal fluctuations in available feeds, migration or in relation to reproduction. In a culture ... -
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 ... -
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 ... -
Water Flow Requirements of Post-smolt Atlantic Salmon (Salmo salar L.) Reared in Intensive Seawater Flow-through Systems: A Physiological Perspective
Calabrese, Sara; Imsland, Albert K. D.; Nilsen, Tom Ole; Kolarevic, Jelena; Ebbesson, Lars O.E.; Hosfeld, Camilla Diesen; Fivelstad, Sveinung; Pedrosa, Cindy; Terjesen, Bendik Fyhn; Stefansson, Sigurd O.; Takle, Harald Rune; Sveier, Harald; Mathisen, Frode; Handeland, Sigurd Olav (Journal article; Peer reviewed, 2023)Environmental challenges related to open sea cage production of Atlantic salmon have sparked interest in developing commercial-scale semi-closed sea systems for post-smolt Atlantic salmon (100–1000 g). Determining the ...