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Foto: HKJ
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Norges fiskerihøgskole helge.johnsen@uit.no +4777644489 90577257 Tromsø NFH C 122

Helge K. Johnsen


Professor

Stillingsbeskrivelse

Professor i fiskefysiologi

Undervisning

  • Fiskefysiologi (Bio-2504), Akvatisk Økofysiologi (Bio-8501), Akvakultur (Bio-2509) og Forsøksdyrlære (Bio 3503)
  • Veiledning av studenter på Bachelor, Master og PhD nivå

  • 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 m.fl.:
    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 m.fl.:
    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 m.fl.:
    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 m.fl.:
    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
  • Even Hjalmar Jørgensen, Helge K. Johnsen :
    Rhythmic life of the Arctic charr: Adaptations to life at the edge
    Marine Genomics 2014 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
  • 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, Arne Mikal Arnesen, Børge Damsgård, Helge Tveiten, Helge K Johnsen :
    Effects of photoperiod on sex steroids and gonad maturation in Arctic charr
    Aquaculture 2004
  • 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, 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
  • 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
  • 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
  • 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
  • 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 - the preprint server for biology 2019 ARKIV / DOI
  • Hanne Johnsen, Hooman Moghadam, Nicholas Andrew Robinson, Øivind Andersen, Even Hjalmar Jørgensen, Helge K. Johnsen m.fl.:
    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 m.fl.:
    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 m.fl.:
    Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida)
    2016
  • 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
  • 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
  • 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, Stein Harris Olsen, Helge K. Johnsen, Øyvind Aas-Hansen :
    Recuperation of Atlantic cod (Gadus morhua) following exhaustive exercise in a swim tunnel
    2014
  • 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

  • De 50 siste resultatene fra Cristin vises på siden. Se alle arbeider i Cristin her →

    Publikasjoner utenom Cristin

    • Tveiten, H., Scott, A.P. and Johnsen, H.K. (2000). C21-steroids involved in final oocyte maturation in common wolffish: Influence of temperature during vitellogenesis. General and Comparative Endocrinology, 117: 464-473.
    • Tveiten, H., Johnsen, H. K. & Schulz, R. (2000). Temperature experienced by female wolffish (Anarhichas lupus L.) during vitellogenesis: sex steroid profiles and influences on the timing of ovulation. 6th International Symposium on Reproductive Physiology of Fish, Bergen, July 4-9, 1999, p.335.
    • Johnsen, H.K., Sæther, B.S., Eliassen, R. & Larsen, J.S. (2000). Effects of photoperiod manipulation on the development of seawater tolerance in Arctic charr (Salvelinus alpinus L.). Aquaculture, 189: 177-188.
    • Tveiten, H., Solevåg, S.E. & Johnsen, H. K. (2001). Holding temperature during the spawning season influences timing of final maturation and egg quality in common wolffish (Anarhichas lupus L.). Journal of Fish Biology, 58: 374-385.
    • Tveiten, H. & Johnsen, H. K. (2001). Thermal influences on temporal changes in plasma sex steroids and reproductive development in female common wolffish. Journal of Fish Biology, 59: 175-178.
    • Aas-Hansen, Ø., Johnsen, H.K., Vijayan, M.M. & Jørgensen, E.H. (2003). Development of seawater tolerance and concurrent hormonal changes in fed and fasted Arctic charr at two temperature regimes. Aquaculture, 222: 135-148.
    • Frantzen, M., Arnesen, A.M. & Damsgård, B., Tveiten, H. &  Johnsen, H.K. (2004). Effects of photoperiod on sex steroids and gonad maturation in Arctic charr. Aquaculture, 240: 561-574.
    • Frantzen, M., Damsgård, B., Tveiten, H., Moriyama, S., Iwata, M. & Johnsen, H.K. (2004). 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, 65: 1526-1542.
    • Aas-Hansen, Ø., Vijayan, M.M., Johnsen, H.K., Cameron, C. and Jørgensen, E.H. (2005). Re-smoltification in wild, anadromous Arctic char (Salvelinus alpinus): a survey of osmoregulatory, metabolic and endocrinechanges preceding annual seawater migration. Canadian Journal of Fisheries and Aquatic Sciences, 62: 195-204.
    • Strand, J.E.T., Johnsen, H.K. & Arnesen, A.M. (2007). Comparison of  parr-smolt transformation in hatchery reared offspring of one domesticated and two wild populations of Atlantic salmon (Salmo salar L.). Aquaculture, 273: 250-256.
    • Ojima, D., Pettersen, R.J., Wolkers, J., Johnsen, H.K. and Jørgensen, E.H. 2009. Growth hormone and cortisol treatment stimulate seawater tolerance in both anadromous and landlocked Arctic charr. Comp. Biochem. Physiol. 153, 378-385.


    Forskningsinteresser

    • Sesongrytmer hos nordlige fiskearter, spesielt laks og røye.
    • Betydning av temperatur og fotoperiode i regulering av sesongrytmer hos lasksefisk.
    • Reproduksjonfysiologi hos nordlige fiskearter.
    • Smoltifisering hos røye og laks.
    • Appetitt og vekst hos laksefisk.
    • Smertepersepsjon hos torsk.
    • Oppdrett av laksefisk generelt.

     


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