Blar i forfatter "Oppedal, Frode"

Viser treff 1-5 av 5

    • 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 ...

    • Fasting and its implications for fish welfare in Atlantic salmon aquaculture 

      Hvas, Malthe; Kolarevic, Jelena; Noble, Christopher; Oppedal, Frode; Stien, Lars Helge (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-20)
      Periods of fasting occur for a multitude of reasons in Atlantic salmon aquaculture. Feed withdrawal is widely used prior to transport, parasite treatments, preslaughter and for depuration purposes in recirculating aquaculture systems. Voluntary fasting is a coping response when fish have poor health or are exposed to poor farm environments. Owing to increased attention to animal welfare in aquaculture, ...

    • Finding the needle in the haystack: Comparison of methods for salmon louse enumeration in plankton samples 

      Bui, Samantha; Dalvin, Sussie; Vågseth, Tone; Oppedal, Frode; Fossøy, Frode; Brandsegg, Hege; Jacobsen, Ása; Nordi, Gunnvør á; Fordyce, Mark; Michelsen, Helena Kling; Finstad, Bengt; Skern-Mauritzen, Rasmus (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-07)
      The economic and social implications of salmon louse (Lepeophtheirus salmonis) epidemics in salmon aquaculture drive focus of the dispersal dynamics of the planktonic larval stages. The vast spatial scale and high connectivity of the marine environment creates difficult conditions to monitor the infective planktonic louse stage, whereby the number of samples required for a representative description ...

    • Optimal estimation of lice release from aquaculture based on ambient temperatures 

      Johnsen, Ingrid A.; Stien, Lars Helge; Sandvik, Anne Dagrun; Asplin, Lars; Oppedal, Frode (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-30)
      Models for mapping and forecasting infective pressure from salmon louse <i>Lepeophtheirus salmonis</i> larvae are of major importance in the Norwegian government’s management of salmonid aquaculture. These models use site-reported temperature and number of egg-producing female adult lice present within cages to calculate how many lice eggs and larvae are released from individual farms. The reported ...

    • The Well – Mixing skirt and freshwater lens concepts with smart-lighting and -feeding to enhance lice prevention and safeguard fish welfare 

      Wright, Daniel William; Stien, Lars Helge; Oppedal, Frode; Sievers, Michael; Ditria, Ellen; Trengereid, Henrik (Research report; Forskningsrapport, 2019)
      A commercial scale sea-cage design, combining skirt and freshwater lens concepts with smart lighting and feeding for improved lice prevention and fish welfare, was trialed. Environment, lice levels and fish welfare were assessed. In addition, acoustic tags and echo sounders were used to track fish behaviour. An associated laboratory trial on brackish water salinity effects on host-attached salmon ...