Blar i forfatter "Strand, Jo Espen Tau"

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    • Dietary effects on biomarkers of growth, stress, and welfare of diploid and triploid Atlantic salmon (Salmo salar) during parr-smolt transformation 

      Bortoletti, Martina; Maccatrozzo, Lisa; Peruzzi, Stefano; Strand, Jo Espen Tau; Jobling, Malcolm; Radaelli, Giuseppe; Bertotto, Daniela (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-12)
      Triploidy is induced in Atlantic salmon (Salmo salar) to produce sterile fish for genetic containment and to hinder early sexual maturation in farmed fish, but it can have unwanted negative effects on growth, health, and welfare. However, the growth and welfare of triploid fish may be improved by adjusting the rearing environment, feeding conditions and diets. This study evaluated physiological ...

    • Micro- and macro-habitat selection of Atlantic salmon, (Salmo salar), post-smolts in relation to marine environmental cues 

      Jensen, Jenny Lovisa Alexandra; Strøm, John Fredrik; Nikolopoulos, Anna; Primicerio, Raul; Skardhamar, Jofrid; Atencio, Benjamin J.; Strand, Jo Espen Tau; Bjørn, Pål Arne; Bøhn, Thomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-20)
      Atlantic salmon is an economically and culturally important species. The species encounters several natural and man-made threats during its migration between fresh water and the ocean, which in combination may explain its ongoing decline. With the aim to better understand whether post-smolt behaviour is influenced by physical oceanographic conditions, the migratory behaviour of 173 post-smolts in a ...

    • Photoperiod revisited: is there a critical day length for triggering a complete parr–smolt transformation in Atlantic salmon Salmo salar? 

      Strand, Jo Espen Tau; Hazlerigg, David; Jørgensen, Even Hjalmar (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-26)
      The present study investigated whether there is a critical length of photoperiod needed to stimulate a completed parr–smolt transformation (PST) in Atlantic salmon <i>Salmo salar</i>. In two experiments, <i>S. salar</i> parr of the Norwegian aquaculture strain held on continuous light were exposed to a short photoperiod (6 L:18D) followed by exposure to 8 L:16D, 12 L:12D, 16 L:8D, 20 L:4D and 24 ...

    • Seaward migrating Atlantic salmon smolts with low levels of gill Na+, K+ -ATPase activity : is sea entry delayed? 

      Strand, Jo Espen Tau; Davidsen, Jan Grimsrud; Jørgensen, Even Hjalmar; Rikardsen, Audun H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2010-11-16)
      Two groups of migrating wild Atlantic salmon (Salmo salar) smolts caught within a 1 week interval in the River Alta, northern Norway, were tagged with acoustic transmitters and measured for gill Na+, K+ -ATPase activity in order to compare their smolt status with timing of sea entry. The first group of smolts had low levels of gill Na+, K+ -ATPase activity and resided in the lower part of the river ...

    • Student questioning generated from an inquiry of an authentic reindeer head 

      Misund, Stig; Strand, Jo Espen Tau; Ødegaard, Marianne (Conference object; Konferansebidrag, 2021-06)
      This study pays special attention to students’ curiosity in science topics, and analyzes their capability in formulating adequate questions for deeper learning. One 5thgrade class and one 6 thgrade class, each divided into smaller groups, were given authentic reindeer heads and challenged to use their “own-hands-skills” in search for new knowledge. Each group had to agree upon at least three ...