Blar i forfatter "Nilsson, Jonatan"

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    • 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 (Research report; Forskningsrapport, 2018-12-21)
      Salmon lice prevention strategies are steering towards passive implementation, and this study aimed to monitor these strategies in commercial cages over time, to determine the efficiency of these approaches and their effect on welfare. Four strategies were tested at a commercial scale at the Centre for Aquaculture Competence (CAC; funded by CAC and FHF), over a 13-month period. The ...

    • 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 (Research report; Forskningsrapport, 2022)
      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 standard.<p> <p>Når en lager en standardisert protokoll for rutinemessig overvåking av fiskevelferd er det mange hensyn å ta, og disse kan til dels være motstridende. Protokollen bør ...

    • Long-term welfare effects of repeated warm water treatments on Atlantic salmon (Salmo salar) 

      Moltumyr, Lene; Nilsson, Jonatan; Madaro, Angelico; Seternes, Tore; Rønnestad, Ivar; Stien, Lars Helge (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-30)
      Warm water treatment has in recent years become widely used for ridding salmonids of sea lice in aquaculture although the consequences of the treatment for fish welfare are not adequately investigated. The objective of this study was to document potential long-term welfare effects of repeated warm water treatments on Atlantic salmon (Salmo salar). Five weeks after a baseline welfare indicator ...

    • Thermal injuries in Atlantic salmon in a pilot Laboratory trial 

      Gismervik, Kristine; Gåsnes, Siri Kristine; Gu, Jinni; Stien, Lars Helge; Madaro, Angelico; Nilsson, Jonatan (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-27)
      Thermal delousing is a new method for removing sea lice from farmed Atlantic salmon (<i>Salmo salar</i> L). We investigated thermally-related tissue injuries in Atlantic salmon in a pilot laboratory trial to describe the acute effect of high water temperatures (34–38 °C). Acute tissue injuries in gills, eyes, brain and possible also nasal cavity and thymus were seen in salmon exposed to water ...