Photo: HKJ
Helge K. Johnsen
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)
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
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)
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)
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
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)
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
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,
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
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,
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,
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 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 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,
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
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
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
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
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
Bjørn-Steinar Sæther,
Helge K. Johnsen,
Malcolm Jobling
:
Influence of photoperiod on feeding and growth of Arctic charr
Special Publications (European Aquaculture Society) 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)
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 – 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
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.