Blar i forfatter "Burgerhout, Erik"

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    • Development of Atlantic Salmon (Salmo salar L.) Under Hypoxic Conditions Induced Sustained Changes in Expression of Immune Genes and Reduced Resistance to Moritella viscosa 

      Krasnov, Aleksei; Burgerhout, Erik; Johnsen, Hanne; Tveiten, Helge; Bakke, Anne Flore; Lund, Hege; Afanasyev, Sergey; Rebl, Alexander; Johansen, Lill-Heidi (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-02)
      Atlantic salmon is characterized with high sensitivity to low dissolved oxygen (DO) levels. Hypoxia can affect diverse biological processes with consequences that can be manifested immediately or with delay. Effects of hypoxia on the immune system and the resistance to a bacterial pathogen were investigated. Two groups were reared at, respectively, normal (NO, 80–100%) and low (LO, 60%) levels of ...

    • Effects of weathered polyethylene microplastic ingestion on sexual maturation, fecundity and egg quality in maturing broodstock Atlantic cod Gadus morhua 

      Fernández-Míguez, Maria; Puvanendran, Velmurugu; Burgerhout, Erik; Presa, Pablo; Tveiten, Helge; Vorkamp, Katrin; Hansen, Øyvind J; Johansson, Gunhild Seljehaug; Bogevik, André Sture (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-09)
      Microplastics (MPs) have become a global issue as they are omnipresent in the ocean. Fish ingesting MPs through feed could be affected in their physiological function, e.g., disrupted enzyme production and function, reduction of feeding and reproductive failure. This study assessed the effects of feed containing naturally weathered MPs from the Oslofjord (Norway) on the reproductive physiology of ...

    • Gradually decreasing daylength after smoltification induced by “winter signal“ reduced sexual maturation in male Atlantic salmon 

      Skjold, Vetle; Rørvik, Kjell-Arne; Sveen, Lene; Burgerhout, Erik; Mota, Vasco C.; Weihe, Runi; Ytrestøyl, Trine; Bou, Marta; Jacobsen, Hans Jakup; Allaoui, Giovanni; Fuskevåg, Ole-Martin; Dessen, Jens-Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-16)
      Introduction: Maturation in seawater-adapted (smoltified) male Atlantic salmon is undesirable yet frequently reported in fish weighing up to 1 kg reared under intensive conditions in land-based facilities. Although the photoperiod regulates both smoltification and maturation, the optimal post-smoltification regimen for the prevention of maturation is unclear.<p> <p>Methods: In this study, ...

    • Ultrasonic imaging as a means of monitoring gonadal development in lumpfish (Cyclopterus lumpus) 

      Mlingi, Frank Thomas; Puvanendran, Velmurugu; Burgerhout, Erik; Tveiten, Helge; Tomkiewicz, Jonna; Kjørsvik, Elin; Mommens, Maren (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-21)
      The commercial farming of juvenile lumpfish requires monitoring of gonadal development to achieve synchronized production. Conventional methods such as gonadosomatic index (GSI), sex hormone analyses, gonadal histology, endoscopy, and gene expression analyses are costly, invasive, and often involve sacrificing the fish. We assessed the efficiency of ultrasound as a non-invasive method for monitoring ...