• Efficacy of salmon lice prevention via snorkel technology depends upon salinity at the farm site, with minimal effects on salmon production and welfare 

      Oppedal, Frode; Bui, Samantha; Overton, Kathy; Stien, Lars Helge; Dempster, Tim (Journal article; Peer reviewed, 2019)
      Sea lice are a critical health issue in most salmonid farming regions. New cage-based technologies can prevent infestations from occurring, such as the ‘snorkel’, which introduces an impermeable barrier that separates ...
    • Efficiency and welfare impact of long-term simultaneous in situ management strategies for salmon louse reduction in commercial sea cages 

      Bui, Samantha; Nilsson, Jonatan; Stien, Lars Helge; Trengereid, Henrik; Oppedal, Frode (Peer reviewed; Journal article, 2020)
      The Atlantic salmon (Salmo salar) aquaculture industry is faced with an obstacle in sustainability with increasing production, which is the control and prevention of the ectoparasitic salmon louse Lepeophtheirus salmonis. ...
    • Environmental drivers of Atlantic salmon behaviour in sea-cages: a review 

      Oppedal, Frode; Dempster, Tim; Stien, Lars Helge (Journal article; Peer reviewed, 2011-02-03)
      Salmon may sense and respond to a range of environmental variables within sea-cages, including light, temperature, salinity, dissolved oxygen, water currents and certain chemical treatments used during production. Environments ...
    • Environmental drivers of Atlantic salmon behaviour in sea-cages: a review 

      Oppedal, Frode; Dempster, Tim; Stien, Lars Helge (Journal article; Peer reviewed, 2011-02-03)
      Salmon may sense and respond to a range of environmental variables within sea-cages, including light, temperature, salinity, dissolved oxygen, water currents and certain chemical treatments used during production. Environments ...
    • Erfaringer og analyser fra drift av oppdrettsanlegg på eksponerte lokaliteter 

      Sandberg, Merete Gisvold; Lien, Andreas Myskja; Sunde, Leif Magne; Størkersen, Kristine Vedal; Stien, Lars Helge; Kristiansen, Tore S (Research report, 2012)
      Dette forprosjektet har hatt som mål å legge til rette for videreutvikling av forskningsrelaterte problemstillinger innen tema drift av eksponerte oppdrettslokaliteter. Eksponerte lokaliteter er her derfor å forstå som ...
    • Farmed salmonids drive the abundance, ecology and evolution of parasitic salmon lice in Norway 

      Dempster, Tim; Overton, Kathy; Bui, Samantha; Stien, Lars Helge; Oppedal, Frode; Karlsen, Ørjan; Coates, Andrew; Phillips, B. L.; Barrett, Luke T. (Peer reviewed; Journal article, 2021)
      Sea cage fish farming is typically open to the environment, with disease transmission possible between farmed and wild hosts. In salmonid aquaculture, salmon louse Lepeophtheirus salmonis infestations cause production ...
    • Får oppdrettslaks nok oksygen? 

      Remen, Mette; Oppedal, Frode; Stien, Lars Helge; Torgersen, Thomas; Olsen, Rolf Erik (Havforskningstema;1-2013, Working paper, 2013)
    • Fish protection during fish production. Organizational conditions for fish welfare 

      Størkersen, Kristine Vedal; Osmundsen, Tonje Cecilie; Stien, Lars Helge; Medaas, Christian; Lien, Marianne Elisabeth; Tørud, Brit; Kristiansen, Tore S; Gismervik, Kristine (Peer reviewed; Journal article, 2021)
      Too many salmon die during production at Norwegian fish farms. Earlier research shows that most farmed salmon die in operations partly related to protection of the wild salmon (from salmon lice), but it is not known how ...
    • Full compensatory growth before harvest and no impact on fish welfare in Atlantic salmon after an 8-week fasting period 

      Hvas, Malthe; Nilsson, Jonatan; Vågseth, Tone; Nola, Velimir; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Oppedal, Frode; Stien, Lars Helge; Folkedal, Ole (Peer reviewed; Journal article, 2021)
      Individually tagged Atlantic salmon postsmolts (≈1200 g, 46 cm) reared in triplicate indoor holding tanks were fasted for 8 weeks at 12 °C and subsequently refed for 5 weeks, whereafter they were transferred to triplicate ...
    • Full production cycle, commercial scale culture of salmon in submerged sea-cages with air domes reduces lice infestation, but creates production and welfare challenges 

      Warren-Myers, Fletcher; Vågseth, Tone; Folkedal, Ole; Stien, Lars Helge; Fosse, Jan Olav; Dempster, Tim; Oppedal, Frode (Peer reviewed; Journal article, 2021)
      Structural modification of sea cages is continually changing to counter major production issues associated with commercial salmon farming. For example, snorkels and skirts are added to cages to reduce salmon lice infestations, ...
    • Første samlerapport: Velferd for triploid laks i Nord-Norge 

      Stien, Lars Helge; Sæther, Per Anton; Kristiansen, Tore S; Fjelldal, Per Gunnar; Sambraus, Florian (Rapport fra havforskningen;2019 - 47, Research report, 2019)
      Denne rapporten tar for seg velferden til 24 grupper av triploid laks satt ut i Nord-Norge 2014-2017. Noen av de tidlige smoltproduksjonene var kjennetegnet av lav eggkvalitet, sykdom eler andre problemer i settefiskfasen, ...
    • Governing the welfare of Norwegian farmed salmon: three conflict cases 

      Stien, Lars Helge; Tørud, Brit; Gismervik, Kristine; Lien, Marianne Elisabeth; Medaas, Christian; Osmundsen, Tonje Cecilie; Kristiansen, Tore S; Størkersen, Kristine Vedal (Peer reviewed; Journal article, 2020)
      To obtain insight into perceptions of how fish welfare and health is governed in Norwegian aquaculture, this study investigates three conflict cases: salmon lice, pancreas disease and farm siting. Using surveys and in-depth ...
    • Hvordan står det til i merden? 

      Gytre, Trygve; Stien, Lars Helge; Oppedal, Frode (Havforskningsnytt, Working paper, 2007)
    • Hvordan unngå flytere ved heving av torskemerder 

      Korsøen, Øyvind Johan; Fosseidengen, Jan Erik; Dempster, Tim; Stien, Lars Helge; Kristiansen, Tore S. (Havforskningsnytt;Nr. 2 - 2011, Working paper, 2011)
      Oppdrettstorsk tåler en trykkreduksjon på maks 40 % dersom en skal være sikker på at svømmeblæren ikke løfter fisken til overflaten med buken i været. Etter en slik reduksjon av trykket bør det gå minst åtte timer før ...
    • Increasing Dip Net Mesh Size Results in More Fin Splits in Post-Smolt Atlantic Salmon (Salmo salar) 

      Moltumyr, Lene; Stien, Lars Helge; Madaro, Angelico; Nilsson, Jonatan (Peer reviewed; Journal article, 2022)
      Dip nets are widely used to retrieve fish from the water but can cause injuries to the fish. The objective of this study was to document the potential effects of dip net mesh size with respect to external injuries, more ...
    • Is it advantageous for Atlantic salmon to be triploid at lower temperatures? 

      Riseth, Erling; Fraser, Thomas; Sambraus, Florian; Stien, Lars Helge; Hvas, Malthe (Peer reviewed; Journal article, 2020)
      Marine organisms living at low temperatures tend to have larger genomes and larger cells which suggest that these traits can be beneficial in colder environments. In fish, triploidy (three complete sets of chromosomes) can ...
    • Kunnskapsstatus - miljøeffekter av norsk fiskeoppdrett 2019 : Risikorapport norsk fiskeoppdrett, del 2 

      Grefsrud, Ellen Sofie; Svåsand, Terje; Glover, Kevin; Husa, Vivian; Hansen, Pia Kupka; Samuelsen, Ole Bent; Sandlund, Nina; Stien, Lars Helge (Fisken og havet;2020 - 6, Research report, 2020)
      Havforskningsinstituttet har siden 2011 gitt ut en årlig rapport for risikovurdering av miljøeffekter knyttet til norsk fiskeoppdrett. Frem til 2018 var risikorapporten både risikovurdering og kunnskapsstatus i ett. For å ...
    • Laksvel - Standardisert operasjonell velferdsovervåking for laks i matfiskanlegg 

      Nilsson, Jonatan; Gismervik, Kristine; Nielsen, Kristoffer Vale; Iversen, Martin Haugmo; Noble, Christopher; Kolarevic, Jelena; Frotjold, Hilde; Nilsen, Kathrine; Wilkinson, Eirik; Klakegg, Barbo; Hauge, Hege Sørvåg; Sæther, Per Anton; Kristiansen, Tore S; Stien, Lars Helge (Rapport fra havforskningen;2022 - 14, Research report, 2022-05-30)
      Selv om oppdrettere og fiskehelsepersonell har undersøkt og dokumentert velferden til laksen har det ikke funnes noen standardisert måte å gjøre dette på. Denne protokollen er laget for å kunne brukes som en felles ...
    • Learning and anticipatory behaviour in a “sit-and-wait” predator: the Atlantic halibut 

      Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik; Stien, Lars Helge; Fernö, Anders; van den Bos, Ruud (Journal article; Peer reviewed, 2010-03)
      We studied the learning capacities and anticipatory behaviour in a “sit-and-wait” predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes ...
    • Learning and anticipatory behaviour in a “sit-and-wait” predator: the Atlantic halibut 

      Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik; Stien, Lars Helge; Fernö, Anders; van den Bos, Ruud (Journal article; Peer reviewed, 2010-03)
      We studied the learning capacities and anticipatory behaviour in a “sit-and-wait” predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes ...