Blar i forfatter "Imsland, Albert"

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    • Caligus elongatus and other sea lice of the genus Caligus as parasites of farmed salmonids: A review 

      Hemmingsen, Willy; MacKenzie, Ken; Sagerup, Kjetil; Remen, Mette; Bloch-Hansen, Karin; Imsland, Albert (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-24)
      This review was prompted by reports of unusually large numbers of sea lice tentatively identified as <i>Caligus elongatus</i> infesting farmed salmon in northern Norway. Following a brief introduction to the sea lice problem in salmonid aquaculture, the review is divided into a further eight sections. The first is a review of existing information on the life cycle and behaviour of <i>Caligus</i> ...

    • The effect of CO2, total ammonia nitrogen and pH on growth of juvenile lumpfish (Cyclopterus lumpus) 

      Thorarensen, Helgi; Imsland, Albert; Monroe, Amber Christina (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-12)
      The objective of this study was to examine the effects of CO<sub>2</sub>, total ammonia nitrogen (TAN: nitrogen bound as either NH<sub>3</sub> or NH<sub>4</sub><sup>+</sup>) and pH on the growth and survival of juvenile lumpfish in a two-month growth study. The results demonstrate the complex interactions of these water quality variables. The specific growth rate (SGR) of the lumpfish was progressively ...

    • Effect of incubation temperature on eggs and larvae of lumpfish (Cyclopterus lumpus) 

      Imsland, Albert; Danielsen, Mathias; Jonassen, Thor Magne; Hangstad, Thor Arne; Falk-Petersen, Inger-Britt (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-24)
      Two batches of lumpfish eggs were incubated at three temperature regimes; 1-Ambient seawater 4–6 °C (cold), 2-Ambient seawater for 10 days followed by a gradual increase to 10 °C (gradient), 3-Constant 10 °C seawater (warm). The eggs incubated in cold water had the highest egg mortality (38.5% ± 15.7) and lowest hatching success (46.1% ± 7.2), while the gradient group regime showed highest hatching ...

    • The effect of temperature on growth performance and aerobic metabolic scope in Arctic charr, Salvelinus alpinus (L.) 

      Beuvard, Christian; Imsland, Albert; Thorarensen, Helgi (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-06)
      In recent years, Arctic char populations in Iceland have declined and the objective of this experiment was to throw further light on these changes by examining the effect of temperature (5, 9, 13, 17, and 21 °C) on the survival, growth rate, metabolism, and physiological indices of juvenile Arctic charr (initial mean body mass 4.02 ± 0.8 g). Mortality was 60% at 21 °C while at lower temperatures it ...