Browsing Brage IMR by Author "Stien, Lars Helge"
Now showing items 1-20 of 92
-
A system for online assessment of fish welfare in aquaculture
Stien, Lars Helge; Gytre, Trygve; Torgersen, Thomas; Sagen, Helge; Kristiansen, Tore S. (ICES CM documents;2008/R:18, Working paper, 2008)Aquaculture sea cages can now be more than 30 meters deep. It has therefore become next to impossible for fish farmers to form a complete picture of the welfare situation of the fish. It is consequently all ]important ... -
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 ... -
Analyse av dødelighetsdata fra spørreundersøkelse om velferd hos rensefisk
Stien, Lars Helge; Størkersen, Kristine Vedal; Gåsnes, Siri Kristine (Rapport fra havforskningen;2020 - 6, Research report, 2020) -
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 ... -
Assessment of long-term implementation of sea lice prevention technologies: efficiency in reducing infestations and impact on fish welfare
Bui, Samantha; Stien, Lars Helge; Nilsson, Jonatan; Oppedal, Frode (Rapport fra havforskningen;45-2018, Research report, 2018) -
Atlantic salmon Salmo salar instantaneously follow vertical light movements in sea cages
Wright, Daniel William; Glaropoulos, Alexis; Solstorm, David; Stien, Lars Helge; Oppedal, Frode (Journal article; Peer reviewed, 2015)Atlantic salmon in marine farming environments are exposed to potentially detrimental conditions through space and time. For instance, the vertical distribution of parasitic salmon lice larvae shifts in response to changing ... -
Avlusing med kaldt vann? – effektivitet og laksens velferd — sluttrapport FHF prosjekt 901488
Oppedal, Frode; Stien, Lars Helge; Wright, Daniel William; Moltumyr, Lene; Nilsson, Jonatan; Dempster, Timothy David; Overton, Kathy (Rapport fra havforskningen, Research report, 2019)Termisk behandling av oppdrettslaks med varmt vann blir hyppig brukt av næringen som avlusingsmetode. Behandlingen rapporteres å fjerne mobile lus effektivt, men kan også føre til dårligere fiskevelferd og økt dødelighet. ... -
Cleaner fish growth, welfare and survival in Atlantic salmon sea cages during an autumn-winter production
Geitung, Lena; Wright, Daniel William; Oppedal, Frode; Stien, Lars Helge; Vågseth, Tone; Madaro, Angelico (Peer reviewed; Journal article, 2020)Cleaner fish used as a biological control agent against salmon lice is rapidly increasing in Atlantic salmon aquaculture. However, concerns have been raised about the welfare and mortality of cleaner fish in salmon cage ... -
Comparison of Norwegian health and welfare regulatory frameworks in salmon and chicken production
Gismervik, Kristine; Tørud, Brit; Kristiansen, Tore S; Osmundsen, Tonje Cecilie; Størkersen, Kristine Vedal; Medaas, Christian; Lien, Marianne Elisabeth; Stien, Lars Helge (Peer reviewed; Journal article, 2020)The health and welfare of farmed fish are often regarded with less concern than for other production animals. This review compares the Norwegian legal health and welfare frameworks for broiler chickens and farmed salmon, ... -
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 ... -
Consistent melanophore spot patterns allow long-term individual recognition of Atlantic salmon Salmo salar
Stien, Lars Helge; Nilsson, Jonatan; Bui, Samantha; Fosseidengen, Jan Erik; Kristiansen, Tore S; Øverli, Øyvind; Folkedal, Ole (Peer reviewed; Journal article, 2017) -
Coping with Unpredictability: Dopaminergic and Neurotrophic Responses to Omission of Expected Reward in Atlantic Salmon (Salmo salar L.)
Vindas, Marco A.; Sørensen, Christina; Johansen, Ida B.; Folkedal, Ole; Höglund, Erik; Khan, Uniza W.; Stien, Lars Helge; Kristiansen, Tore S.; Braastad, Bjarne O.; Øverli, Øyvind (Journal article; Peer reviewed, 2014-01-17)Comparative studies are imperative for understanding the evolution of adaptive neurobiological processes such as neural plasticity, cognition, and emotion. Previously we have reported that prolonged omission of expected ... -
Declining size-at-harvest in Norwegian salmon aquaculture: Lice, disease, and the role of stunboats
Barrett, LukeT.; Oldham, Tina Marie Wier; Kristiansen, Trond; Oppedal, Frode; Stien, Lars Helge (Peer reviewed; Journal article, 2022)Sea cages used for fish farming are typically open to the environment, making the grow-out phase a race against the accumulation of infections. In Norway, farmed Atlantic salmon (Salmo salar) suffer outbreaks of salmon ... -
Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments
Thompson, Cameron; Madaro, Angelico; Oppedal, Frode; Stien, Lars Helge; Bui, Samantha (Rapport fra havforskningen;2023 - 11, Research report, 2023)A pilot study was conducted to investigate the delousing efficacy and physiological effects of freshwater and hyposaline water in Atlantic salmon ( Salmo salar ) for various treatment durations. There were four primary ... -
Different Dietary Levels of Protein to Lipid Ratio Affected Digestive Efficiency, Skeletal Growth, and Muscle Protein in Rainbow Trout Families
Torrissen, Krisna Rungruangsak; Stien, Lars Helge; Daae, Britt S.; Vågseth, Tone; Thorsheim, Grethe B.; Tobin, Declan; Ritola, Ossi (Journal article; Peer reviewed, 2009)Normal Protein (NP) and High Protein (HP) diets were provided to rainbow trout families from juvenile to maturity. Muscle protein concentration increased during growth and the protein to lipid (P/L) ratio was doubled at ... -
Differential effects of internal tagging depending on depth treatment in Atlantic salmon: a cautionary tale for aquatic animal tag use.
Wright, Daniel William; Stien, Lars Helge; Dempster, Timothy David; Oppedal, Frode (Journal article; Peer reviewed, 2019)Electronic tags are widespread tools for studying aquatic animal behavior; however, tags risk behavioral manipulation and negative welfare outcomes. During an experiment to test behavioral differences of Atlantic salmon ... -
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)?
Moltumyr, Lene; Gismervik, Kristine; Gu, Jinni; Gåsnes, Siri Kristine; Kristiansen, Tore S; Rønnestad, Ivar; Nilsson, Jonatan; Stien, Lars Helge (Peer reviewed; Journal article, 2020)Warm water treatment, i.e. exposure to sea water at a temperature of 28–34 °C for 20–30 s, has in recent years been widely used for delousing of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) in ... -
The effect of fasting period on swimming performance, blood parameters and stress recovery in Atlantic salmon post smolts
Hvas, Malthe; Stien, Lars Helge; Oppedal, Frode (Peer reviewed; Journal article, 2021)In this study, Atlantic salmon post smolts (~250 g, ~29 cm) were fasted for four weeks at 12 °C in full strength seawater. During this period, the critical swimming speed (Ucrit) was measured after 1, 2 and 4 weeks of ... -
The effect of temperature on ability of Lepeophtheirus salmonis to infect and persist on Atlantic salmon (Salmo salar)
Dalvin, Sussie; Hamre, Lars Are; Skern-Mauritzen, Rasmus; Vågseth, Tone; Stien, Lars Helge; Oppedal, Frode; Bui, Samantha (Peer reviewed; Journal article, 2020)The salmon louse (Lepeophtheirus salmonis) is an ecologically and economically important parasite of salmonid fish. Temperature is a strong influencer of biological processes in salmon lice, with development rate increased ... -
Effekt på dyrevelferd av gjentatte termiske behandlinger med ulik Δt, ulik utgangstemperatur og ulik behandlingstemperatur
Stien, Lars Helge; Bui, Samantha; Nilsson, Jonatan; Madaro, Angelico; Fjelldal, Per Gunnar; Schrøder, Merete Bjørgan; Venås, Birger; Johansen, Malin; Seternes, Tore; Åkesson, Caroline Piercey; Wisløff, Helene; Brinchmann, Monica Fengsrud; Patel, Deepti Manjari; Iversen, Martin Haugmo (Rapport fra havforskningen;2022 - 39, Research report, 2022)Formålet med forsøkene i arbeidspakke 2 i TermVel-prosjektet var å avdekke effekt på dyrevelferd av gjentatt termisk behandling av laks gitt ulik utgangstemperatur, ulik behandlingstemperatur og ulik Δt (differanse mellom ...