Bilde av Johnsen, Helge K.
Photo: HKJ
Bilde av Johnsen, Helge K.
The Norwegian College of Fishery Science helge.johnsen@uit.no +4777644489 90577257 You can find me here

Helge K. Johnsen


Professor

Job description

Research

Fish Physiology and Aquaculture

 

Teaching

Bio-2504, Bio-2509, Bio-3528, Bio-3503


  • Ragnhild Aven Svalheim, Øyvind Aas-Hansen, Karsten Heia, Anders Karlsson-Drangsholt, Stein Harris Olsen, Helge K. Johnsen :
    Simulated trawling: Exhaustive swimming followed by extreme crowding as contributing reasons to variable fillet quality in trawl-caught Atlantic cod (Gadus morhua)
    PLOS ONE 2020 ARKIV / DOI
  • Christoffer Rozenfeld, Victor García-Carpintero, Luz Pérez, Victor Gallego, Juan Germán Herranz-Jusdado, Helge Tveiten et al.:
    Cold seawater induces early sexual developmental stages in the BPG axis of European eel males
    BMC Genomics 2019 ARKIV / DOI
  • Anders Karlsson-Drangsholt, Ragnhild Aven Svalheim, Øyvind Aas-Hansen, Stein Harris Olsen, Kjell Øivind Midling, Michael Breen et al.:
    Recovery from exhaustive swimming and its effect on fillet quality in haddock (Melanogrammus aeglefinus)
    Fisheries Research 2018 ARKIV / DOI
  • Ragnhild Aven Svalheim, Anders Karlsson-Drangsholt, Stein Harris Olsen, Helge K. Johnsen, Øyvind Aas-Hansen :
    Effects of exhaustive swimming and subsequent recuperation on flesh quality in unstressed Atlantic cod (Gadus morhua)
    Fisheries Research 2017 ARKIV / DOI
  • Hooman Moghadam, Hanne Johnsen, Nick Robinson, Øivind Andersen, Even Hjalmar Jørgensen, Helge K. Johnsen et al.:
    Impacts of Early Life Stress on the Methylome and Transcriptome of Atlantic Salmon
    Scientific Reports 2017 ARKIV / DOI
  • Morgan Lizabeth Bender, Marianne Frantzen, Ireen Vieweg, Inger-Britt Falk-Petersen, Helge Kreutzer Johnsen, Geir Rudolfsen et al.:
    Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida)
    Aquatic Toxicology 2016 ARKIV / DOI
  • Rune Knudsen, Helge K. Johnsen, Bjørn-Steinar Sæther, Sten Ivar Siikavuopio :
    Divdergent growth patterns between juveniles of two sympatric Arctic charr morphs with contrasting depth gradient niche preferences
    Aquatic Ecology 2015 DOI
  • Stian Ludvigsen, Niels Chr. Stenklev, Helge K. Johnsen, Einar Laukli, Dagfinn Matre, Øyvind Aas-Hansen :
    Evoked potentials in the Atlantic cod following putatively innocuous and putatively noxious electrical stimulation: A minimally invasive approach
    Fish Physiology & Biochemistry 2014 ARKIV / DOI
  • Even Hjalmar Jørgensen, Helge K. Johnsen :
    Rhythmic life of the Arctic charr: Adaptations to life at the edge
    Marine Genomics 2014 DOI
  • Sten Ivar Siikavuopio, Bjørn-Steinar Sæther, Helge K. Johnsen, Tor Hatten Evensen, Rune Knudsen :
    Temperature preference of juvenile Arctic charr originating from different thermal environments
    Aquatic Ecology 2014 DOI
  • Børge Damsgård, Frode Bjørklund, Helge K. Johnsen, Hilde Toften :
    Short- and long-term effects of fish density and specific water flow on the welfare of Atlantic cod, Gadus morhua
    Aquaculture 2011 DOI
  • Helge Tveiten, Pål Arne Bjørn, Helge K. Johnsen, B Finstad, R. S. McKinley :
    Effects of the sea louse Lepeophtheirus salmonis on temporal changes in cortisol, sex steroids, growth and reproductive investment in Arctic charr Salvelinus alpinus
    Journal of Fish Biology 2010 DOI
  • Daisuke Ojima, Roger Johan Pettersen, Judith Wolkers, Helge K. Johnsen, Even Hjalmar Jørgensen :
    Growth hormone and cortisol treatment stimulate seawater tolerance in both anadromous and landlocked Arctic charr
    Comparative Biochemistry and Physiology A 2009 DOI
  • Jo Espen Tau Strand, Helge Kreutzer Johnsen, Arne Mikal Arnesen :
    Comparison of parr-smolt transformation in hatchery reared offspring of one domesticated and two wild populations of Atlantic salmon (Salmo salar L.)
    Aquaculture 2007 DOI
  • Øyvind Aas-Hansen, Mathilakath M Vijayan, Helge K Johnsen, Colin Cameron, Even Hjalmar Jørgensen :
    Resmoltification in wild, anadromous Arctic char (Salvelinus alpinus): a survey of osmoregulatory, metabolic, and endocrine changes preceding annual seawater migration
    Canadian Journal of Fisheries and Aquatic Sciences 2005 DOI
  • Marianne Frantzen, Børge Damsgård, Helge Tveiten, Shunsuke Moriyama, M Iwata, Helge K. Johnsen :
    Effects of fasting on temporal changes in plasma concentrations of sex steroids, growth hormone and insulin-like growth factor I, and reproductive investment in Arctic charr
    Journal of Fish Biology 2004 DOI
  • Marianne Frantzen, Børge Damsgård, Helge Tveiten, Shunsuke Moriyama, Munehico Iwata, Helge K Johnsen :
    Effects of fastng on temporal changes in plasma concentrations of sex steroids, growth hormone and insuline-like growth factor I, and reproductive investment in Arctic charr
    Journal of Fish Biology 2004 DOI
  • Marianne Frantzen, Arne Mikal Arnesen, Børge Damsgård, Helge Tveiten, Helge K Johnsen :
    Effects of photoperiod on sex steroids and gonad maturation in Arctic charr
    Aquaculture 2004
  • Øyvind Aas-Hansen, Helge K Johnsen, Mathilakath M Vijayan, Even Hjalmar Jørgensen :
    Development of seawater tolerance and concurrent hormonal changes in fed and fasted Arctic charr at two temperatures
    Aquaculture 2003
  • Helge Tveiten, Stein Eric Solevåg, Helge K. Johnsen :
    Holding temperature during the spawning season influences timing of final maturation and egg quality in common wolffish (Anarhichas lupus L.).
    Journal of Fish Biology 2001
  • Helge Tveiten, Helge K. Johnsen :
    Thermal influences on temporal changes in plasma sex steroids and reproductive development in female common wolffish.
    Journal of Fish Biology 2001
  • Helge Tveiten, Alexander P. Scott, Helge K. Johnsen :
    Plasma-sulfated C21-steroids increaseduring the preovulatory period in female common wolffish and are influenced by temperature during vitellogenesis.
    General and Comparative Endocrinology 2000
  • Helge K. Johnsen, Bjørn-Steinar Sæther, Robert Eliassen, Jørund S Larsen :
    Effects of photoperiod manipulation on the development of seawater tolerance in Arctic charr (Salvelinus alpinus L.).
    Aquaculture 2000
  • Helge K. Johnsen, Helge Tveiten, Nils Peder Willassen, Arne Mikal Arnesen :
    Arctic charr (Salvelinus alpinus) vitellogenin: development and validation of an enzyme-linked immunosorbent assay (ELISA).
    Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology 1999
  • Helge Tveiten, Helge K. Johnsen :
    Temperature experienced during vitellogenesis influences ovarian maturation and the timing of ovulation in common wolffish.
    Journal of Fish Biology 1999
  • Helge Tveiten, Ian Mayer, Helge K. Johnsen, Malcolm Jobling :
    Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle.
    Journal of Fish Biology 1998
  • Arne Mikal Arnesen, Helge K. Johnsen, Atle Mortensen, Malcolm Jobling :
    Acclimation of Atlantic salmon (Salmo salar) smolts to "cold" seawater following direct transfer from freshwater.
    Aquaculture 1998
  • R. Eliassen, Helge K. Johnsen, Ian Mayer, Malcolm Jobling :
    Contrasts in osmoregulatory capacity of two Arctic charr, Salvelinus alpinus (L.), strains from northern Norway.
    Aquaculture 1998
  • Marianne Frantzen, Helge K Johnsen, Ian Mayer :
    Gonadal development and sex steroids in a female Arctic charr broodstock
    Journal of Fish Biology 1997
  • Helge Tveiten, Helge K. Johnsen, Malcolm Jobling :
    Influence of maturity status on the annual cycles of feeding and growth in Arctic charr, Salvelinus alpinus (L.).
    Journal of Fish Biology 1996
  • Bjørn-Steinar Sæther, Helge K. Johnsen, Malcolm Jobling :
    Influence of photoperiod on feeding and growth of Arctic charr
    Special Publications (European Aquaculture Society) 1995
  • Malcolm Jobling, Helge K. Johnsen, Gerd Wibeche Pettersen, R. J. Henderson :
    Effects of temperature on reproductive development in Arctic charr, Salvelinus alpinus (L.).
    Journal of Thermal Biology 1995
  • Helge K. Johnsen, Karen B. Helle, Jan M Lundberg, Tomas Hökfelt, Lars Folkow :
    Distribution and vasomotor effects of neuropeptides in the angularis oculi and facial veins of reindeer.
    Comparative Biochemistry and Physiology - Part A: Comparative Physiology 1992
  • Jørgen Schou Christiansen, Helge K. Johnsen, Malcolm Jobling :
    The combined effects of ambient temperature and enforced sustained swimming activity on body temperatures of arctic charr (salvelinus alpinus L.)
    Journal of Thermal Biology 1991 DOI
  • Helge K. Johnsen, Lars Folkow :
    Vascular control of brain cooling in reindeer.
    American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1988
  • Helge K. Johnsen, Arnoldus S Blix, James B. Mercer, K.-D. Bolz :
    Selective cooling of the brain in reindeer.
    American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1987
  • James B. Mercer, Helge K. Johnsen, Arnoldus S Blix, ragnar Hotvedt :
    Central control of expired air temperature and other thermoregulatory effectors in reindeer.
    American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1985
  • Helge K. Johnsen, Arnoldus S Blix, Leif Jørgensen, James B. Mercer :
    Vascular basis for regulation of nasal heat exchange in reindeer.
    American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1985
  • Helge K. Johnsen, Arne Rognmo, Kjell J. Nilssen, Arnoldus S Blix :
    Seasonal changes in the relative importance of different avenues of heat loss in resting and running reindeer.
    Acta Physiologica Scandinavica 1985
  • Kjell J. Nilssen, Helge K. Johnsen, Arne Rognmo, Arnoldus S Blix :
    Heart rate and energy expenditure in resting and running Svalbard and Norwegian reindeer.
    American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1984
  • Ragnhild Aven Svalheim, Øyvind Aas-Hansen, Karsten Heia, Anders Drangsholt-Karlsson, Stein Harris Olsen, Helge K. Johnsen :
    Simulated trawling: Exhaustive swimming followed by extreme crowding as contributing reasons to variable fillet quality in trawl-caught Atlantic cod (Gadus morhua)
    bioRxiv 2019 ARKIV / DOI
  • Hanne Johnsen, Hooman Moghadam, Nicholas Andrew Robinson, Øivind Andersen, Even Hjalmar Jørgensen, Helge K. Johnsen et al.:
    Stimulering av stressrespons i tidlige livsstadier hos laks har positiv effekt på vekst senere i livet
    2018
  • Hanne Johnsen, Hooman Moghadam, Nick Robinson, Øivind Andersen, Even Hjalmar Jørgensen, Helge K. Johnsen et al.:
    IMPACTS OF EARLY LIFE STRESS ON THE METHYLOME AND TRANSCRIPTOME OF ATLANTIC SALMON
    2017
  • Morgan Lizabeth Bender, Marianne Frantzen, Ireen Vieweg, Inger-Britt Falk-Petersen, Helge K. Johnsen, Geir Rudolfsen et al.:
    Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida)
    2016
  • Ragnhild Aven Svalheim, Anders Karlsson, Stein Harris Olsen, Helge K. Johnsen, Øyvind Aas-Hansen :
    Recuperation of Atlantic cod (Gadus morhua) following exhaustive exercise in a swim tunnel
    2014
  • Ragnhild Aven Svalheim, Anders Karlsson, Stein Harris Olsen, Helge K. Johnsen, Øyvind Aas-Hansen :
    Recuperation of Atlantic cod (Gadus morhua) following exhaustive exercise in a swim tunnel – How can knowledge on swimming physiology improve quality
    2014
  • Ragnhild Aven Svalheim, Anders Karlsson, Jonil T. Ursin, Helge K. Johnsen, Stein Harris Olsen, Øyvind Aas-Hansen :
    Swimming fish to improve welfare and quality
    2014
  • Anders Karlsson, Øyvind Aas-Hansen, Helge K. Johnsen, Tonje Jensen, Karl-Erik Eilertsen, Stefano Peruzzi :
    Recovery from Exhaustive, Anaerobic Exercise in Triploid and Diploid Atlantic Cod
  • Marianne Frantzen, Børge Damsgård, Helge Tveiten, Shunsuke Moriyama, Munehico Iwata, Helge K Johnsen :
    Effects of fasting on temporal changes in plasma concentrations of sex steroids, growth hormone and insulin-like growth factor I, and reproductive investment in Arctic charr
    2004
  • Helge Tveiten, Helge K. Johnsen, Rüdiger Schulz :
    Temperature experienced by female wolffish (Anarhichas lupus L.) during vitellogenesis: sex steroid profiles and influences on the timing of ovulation.
    1999

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    Research interests

    My research focus on seasonal rhythms in high arctic fish, with particular emphasis on reproduction and parr smolt transformation in salmoids and how such rhythms are affected by seasonal changes in photoperiod and temperature. Studies are undertaken both under experimental conditions and in the field.

    My research interests also include studies on pain perception in fish, using atlantic cod as a model.


    Member of research group