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Professor

Helge K. Johnsen

Professor
The Norwegian College of Fishery Science

Job description:

Research

Fish Physiology and Aquaculture

 

Teaching

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




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.

Publications in CRIStin


  • Rozenfeld, Christoffer; García-Carpintero, Victor; Pérez, Luz; Gallego, Victor; Herranz-Jusdado, Juan Germán; Tveiten, Helge; Johnsen, Helge K.; Fontaine, Romain David; Weltzien, Finn-Arne; Cañizares, Joaquín; Asturiano, Juan F.; Penaranda, David Sanchez. Cold seawater induces early sexual developmental stages in the BPG axis of European eel males. BMC Genomics 2019; Volum 20. ISSN 1471-2164.s doi: 10.1186/s12864-019-5969-6.

  • Karlsson-Drangsholt, Anders; Svalheim, Ragnhild Aven; Aas-Hansen, Øyvind; Olsen, Stein Harris; Midling, Kjell Øivind; Breen, Michael; Grimsbø, Endre; Johnsen, Helge K.. Recovery from exhaustive swimming and its effect on fillet quality in haddock (Melanogrammus aeglefinus). Fisheries Research 2018; Volum 197. ISSN 0165-7836.s 96 - 104.s doi: 10.1016/j.fishres.2017.09.006.

  • Svalheim, Ragnhild Aven; Karlsson-Drangsholt, Anders; Olsen, Stein Harris; Johnsen, Helge K.; Aas-Hansen, Øyvind. Effects of exhaustive swimming and subsequent recuperation on flesh quality in unstressed Atlantic cod (Gadus morhua). Fisheries Research 2017; Volum 193. ISSN 0165-7836.s 158 - 163.s doi: 10.1016/j.fishres.2017.04.008.

  • Moghadam, Hooman; Johnsen, Hanne; Robinson, Nick; Andersen, Øivind; Jørgensen, Even Hjalmar; Johnsen, Helge K.; Bæhr, Vegar Jakobsen; Tveiten, Helge. Impacts of Early Life Stress on the Methylome and Transcriptome of Atlantic Salmon. Scientific Reports 2017; Volum 7. ISSN 2045-2322.s 1 - 11.s doi: 10.1038/s41598-017-05222-2.

  • Bender, Morgan Lizabeth; Frantzen, Marianne; Vieweg, Ireen; Falk-Petersen, Inger-Britt; Johnsen, Helge Kreutzer; Rudolfsen, Geir; Tollefsen, Knut Erik; Dubourg, Paul; Nahrgang, Jasmine. Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida). Aquatic Toxicology 2016; Volum 180. ISSN 0166-445X.s 196 - 208.s doi: 10.1016/j.aquatox.2016.10.005.

  • Knudsen, Rune; Johnsen, Helge K.; Sæther, Bjørn-Steinar; Siikavuopio, Sten Ivar. Divdergent growth patterns between juveniles of two sympatric Arctic charr morphs with contrasting depth gradient niche preferences. Aquatic Ecology 2015; Volum 49 (1). ISSN 1386-2588.s 33 - 42.s doi: 10.1007/s10452-015-9502-y.

  • Jørgensen, Even Hjalmar; Johnsen, Helge K.. Rhythmic life of the Arctic charr: Adaptations to life at the edge. Marine Genomics 2014; Volum 14. ISSN 1874-7787.s 71 - 81.s doi: 10.1016/j.margen.2013.10.005.

  • Siikavuopio, Sten Ivar; Sæther, Bjørn-Steinar; Johnsen, Helge K.; Evensen, Tor Hatten; Knudsen, Rune. Temperature preference of juvenile Arctic charr originating from different thermal environments. Aquatic Ecology 2014; Volum 48 (3). ISSN 1386-2588.s 313 - 320.s doi: 10.1007/s10452-014-9485-0.

  • Ludvigsen, Stian; Stenklev, Niels Chr.; Johnsen, Helge K.; Laukli, Einar; Matre, Dagfinn; Aas-Hansen, Øyvind. Evoked potentials in the Atlantic cod following putatively innocuous and putatively noxious electrical stimulation: A minimally invasive approach. Fish Physiology & Biochemistry 2014; Volum 40 (1). ISSN 0920-1742.s 173 - 181.s doi: 10.1007/s10695-013-9834-2.

  • Damsgård, Børge; Bjørklund, Frode; Johnsen, Helge K.; Toften, Hilde. Short- and long-term effects of fish density and specific water flow on the welfare of Atlantic cod, Gadus morhua. Aquaculture 2011; Volum 322-323. ISSN 0044-8486.s 184 - 190.s doi: 10.1016/j.aquaculture.2011.09.025.

  • Tveiten, Helge; Bjørn, Pål Arne; Johnsen, Helge K.; Finstad, B; McKinley, R. S.. 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; Volum 76 (10). ISSN 0022-1112.s 2318 - 2341.s doi: 10.1111/j.1095-8649.2010.02636.x.

  • Ojima, Daisuke; Pettersen, Roger Johan; Wolkers, Judith; Johnsen, Helge K.; Jørgensen, Even Hjalmar. Growth hormone and cortisol treatment stimulate seawater tolerance in both anadromous and landlocked Arctic charr. Comparative Biochemistry and Physiology A 2009; Volum 153 (4). ISSN 1095-6433.s 378 - 385.s doi: 10.1016/j.cbpa.2009.03.014.

  • Strand, Jo Espen Tau; Johnsen, Helge Kreutzer; Arnesen, Arne Mikal. Comparison of parr-smolt transformation in hatchery reared offspring of one domesticated and two wild populations of Atlantic salmon (Salmo salar L.). Aquaculture 2007; Volum 273 (2-3). ISSN 0044-8486.s 205 - 256.s doi: 10.1016/j.aquaculture.2007.10.007.

  • Aas-Hansen, Øyvind; Vijayan, Mathilakath M; Johnsen, Helge K; Cameron, Colin; Jørgensen, Even Hjalmar. 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; Volum 62. ISSN 0706-652X.s 195 - 204.s doi: 10.1139/F04-186.

  • Frantzen, Marianne; Damsgård, Børge; Tveiten, Helge; Moriyama, Shunsuke; Iwata, M; Johnsen, Helge K.. 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; Volum 65. ISSN 0022-1112.s 1526 - 1542.s doi: 10.1111/j.1095-8649.2004.00564.x.

  • Frantzen, Marianne; Arnesen, Arne Mikal; Damsgård, Børge; Tveiten, Helge; Johnsen, Helge K. Effects of photoperiod on sex steroids and gonad maturation in Arctic charr. Aquaculture 2004; Volum 240. ISSN 0044-8486.s 561 - 574.

  • Frantzen, Marianne; Damsgård, Børge; Tveiten, Helge; Moriyama, Shunsuke; Iwata, Munehico; Johnsen, Helge K. 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; Volum 65. ISSN 0022-1112.s 1526 - 1542.s doi: 10.111/j.1095-8649.2004.00564.

  • Aas-Hansen, Øyvind; Johnsen, Helge K; Vijayan, Mathilakath M; Jørgensen, Even Hjalmar. Development of seawater tolerance and concurrent hormonal changes in fed and fasted Arctic charr at two temperatures. Aquaculture 2003; Volum 222. ISSN 0044-8486.s 135 - 148.

  • Tveiten, Helge; Johnsen, Helge K.. Thermal influences on temporal changes in plasma sex steroids and reproductive development in female common wolffish.. Journal of Fish Biology 2001; Volum 59. ISSN 0022-1112.s 175 - 178.

  • Tveiten, Helge; Solevåg, Stein Eric; Johnsen, Helge K.. 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; Volum 58. ISSN 0022-1112.s 374 - 385.

  • Tveiten, Helge; Scott, Alexander P.; Johnsen, Helge K.. Plasma-sulfated C21-steroids increaseduring the preovulatory period in female common wolffish and are influenced by temperature during vitellogenesis.. General and Comparative Endocrinology 2000; Volum 117. ISSN 0016-6480.s 464 - 473.

  • Johnsen, Helge K.; Sæther, Bjørn-Steinar; Eliassen, Robert; Larsen, Jørund S. Effects of photoperiod manipulation on the development of seawater tolerance in Arctic charr (Salvelinus alpinus L.).. Aquaculture 2000; Volum 189. ISSN 0044-8486.s 177 - 188.

  • Tveiten, Helge; Johnsen, Helge K.. Temperature experienced during vitellogenesis influences ovarian maturation and the timing of ovulation in common wolffish.. Journal of Fish Biology 1999; Volum 55. ISSN 0022-1112.s 809 - 819.

  • Johnsen, Helge K.; Tveiten, Helge; Willassen, Nils Peder; Arnesen, Arne Mikal. 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; Volum 124. ISSN 1096-4959.s 355 - 362.

  • Eliassen, R.; Johnsen, Helge K.; Mayer, Ian; Jobling, Malcolm. Contrasts in osmoregulatory capacity of two Arctic charr, Salvelinus alpinus (L.), strains from northern Norway.. Aquaculture 1998; Volum 168. ISSN 0044-8486.s 255 - 269.

  • Tveiten, Helge; Mayer, Ian; Johnsen, Helge K.; Jobling, Malcolm. Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle.. Journal of Fish Biology 1998; Volum 53. ISSN 0022-1112.s 714 - 727.

  • Arnesen, Arne Mikal; Johnsen, Helge K.; Mortensen, Atle; Jobling, Malcolm. Acclimation of Atlantic salmon (Salmo salar) smolts to "cold" seawater following direct transfer from freshwater.. Aquaculture 1998; Volum 168. ISSN 0044-8486.s 351 - 367.

  • Frantzen, Marianne; Johnsen, Helge K; Mayer, Ian. Gonadal development and sex steroids in a female Arctic charr broodstock. Journal of Fish Biology 1997; Volum 51 (4). ISSN 0022-1112.s 697 - 709.

  • Tveiten, Helge; Johnsen, Helge K.; Jobling, Malcolm. Influence of maturity status on the annual cycles of feeding and growth in Arctic charr, Salvelinus alpinus (L.).. Journal of Fish Biology 1996; Volum 48. ISSN 0022-1112.s 910 - 924.

  • Sæther, Bjørn-Steinar; Johnsen, Helge K.; Jobling, Malcolm. Influence of photoperiod on feeding and growth of Arctic charr. Special Publications (European Aquaculture Society) 1995; Volum 23. ISSN 0774-0689.s 265 - 166.

  • Jobling, Malcolm; Johnsen, Helge K.; Pettersen, Gerd Wibeche; Henderson, R. J.. Effects of temperature on reproductive development in Arctic charr, Salvelinus alpinus (L.).. Journal of Thermal Biology 1995; Volum 20. ISSN 0306-4565.s 157 - 165.

  • Johnsen, Helge K.; Helle, Karen B.; Lundberg, Jan M; Hökfelt, Tomas; Folkow, Lars. Distribution and vasomotor effects of neuropeptides in the angularis oculi and facial veins of reindeer.. Comparative Biochemistry and Physiology - Part A: Comparative Physiology 1992; Volum 101. ISSN 0300-9629.s 269 - 276.

  • Christiansen, Jørgen Schou; Johnsen, Helge K.; Jobling, Malcolm. 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; Volum 16 (6). ISSN 0306-4565.s 351 - 355.s doi: 10.1016/0306-4565(91)90062-7.

  • Johnsen, Helge K.; Folkow, Lars. Vascular control of brain cooling in reindeer.. American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1988; Volum 254. ISSN 0363-6119.s 730 - 739.

  • Johnsen, Helge K.; Blix, Arnoldus S; Mercer, James B.; Bolz, K.-D.. Selective cooling of the brain in reindeer.. American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1987; Volum 253. ISSN 0363-6119.s 848 - 853.

  • Johnsen, Helge K.; Blix, Arnoldus S; Jørgensen, Leif; Mercer, James B.. Vascular basis for regulation of nasal heat exchange in reindeer.. American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1985; Volum 249. ISSN 0363-6119.s 617 - 623.

  • Mercer, James B.; Johnsen, Helge K.; Blix, Arnoldus S; Hotvedt, ragnar. Central control of expired air temperature and other thermoregulatory effectors in reindeer.. American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1985; Volum 248. ISSN 0363-6119.s 679 - 685.

  • Johnsen, Helge K.; Rognmo, Arne; Nilssen, Kjell J.; Blix, Arnoldus S. Seasonal changes in the relative importance of different avenues of heat loss in resting and running reindeer.. Acta Physiologica Scandinavica 1985; Volum 123. ISSN 0001-6772.s 73 - 79.

  • Nilssen, Kjell J.; Johnsen, Helge K.; Rognmo, Arne; Blix, Arnoldus S. Heart rate and energy expenditure in resting and running Svalbard and Norwegian reindeer.. American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1984; Volum 246. ISSN 0363-6119.s 963 - 967.

  • Blix, Arnoldus S; Johnsen, Helge K.. Aspects of nasal heat exchange in resting reindeer.. Journal of Physiology 1983; Volum 340. ISSN 0022-3751.s 445 - 454.

  • Svalheim, Ragnhild Aven; Aas-Hansen, Øyvind; Heia, Karsten; Drangsholt-Karlsson, Anders; Olsen, Stein Harris; Johnsen, Helge K.. 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.s doi: 10.1101/372581.

  • Johnsen, Hanne; Moghadam, Hooman; Robinson, Nicholas Andrew; Andersen, Øivind; Jørgensen, Even Hjalmar; Johnsen, Helge K.; Bæhr, Vegar Jakobsen; Tveiten, Helge. Stimulering av stressrespons i tidlige livsstadier hos laks har positiv effekt på vekst senere i livet. Havbruk 2018 – Havbruk i samfunnet 2018-04-18 - 2018-04-20 2018.

  • Johnsen, Hanne; Moghadam, Hooman; Robinson, Nick; Andersen, Øivind; Jørgensen, Even Hjalmar; Johnsen, Helge K.; Bæhr, Vegar J.; Tveiten, Helge. IMPACTS OF EARLY LIFE STRESS ON THE METHYLOME AND TRANSCRIPTOME OF ATLANTIC SALMON. Aquaculture Europe 2017 2017-10-17 - 2017-10-20 2017.

  • Bender, Morgan Lizabeth; Frantzen, Marianne; Vieweg, Ireen; Falk-Petersen, Inger-Britt; Johnsen, Helge K.; Rudolfsen, Geir; Tollefsen, Knut Erik; Dubourg, Paul; Nahrgang, Jasmine. Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida). Norwegian Environmental Toxicology Symposium 2016-10-24 - 2016.

  • Svalheim, Ragnhild Aven; Karlsson, Anders; Olsen, Stein Harris; Johnsen, Helge K.; Aas-Hansen, Øyvind. Recuperation of Atlantic cod (Gadus morhua) following exhaustive exercise in a swim tunnel – How can knowledge on swimming physiology improve quality. ICBF (International Congress on the Biology of Fishes) 2014-08-07 - 2014.

  • Svalheim, Ragnhild Aven; Karlsson, Anders; Olsen, Stein Harris; Johnsen, Helge K.; Aas-Hansen, Øyvind. Recuperation of Atlantic cod (Gadus morhua) following exhaustive exercise in a swim tunnel. 44th WEFTA Conference 2014-06-09 - 2014-06-11 2014.

  • Svalheim, Ragnhild Aven; Karlsson, Anders; Ursin, Jonil T.; Johnsen, Helge K.; Olsen, Stein Harris; Aas-Hansen, Øyvind. Swimming fish to improve welfare and quality. 2nd FitFish Workshop on the Swimming Physiology of Fish 2014-10-10 - 2014-10-10 2014.

  • Karlsson, Anders; Aas-Hansen, Øyvind; Johnsen, Helge K.; Jensen, Tonje; Eilertsen, Karl-Erik; Peruzzi, Stefano. Recovery from Exhaustive, Anaerobic Exercise in Triploid and Diploid Atlantic Cod. AFS 2014 Annual Meeting. From Fisheries Research to Management (fulltekst) (prosjekt) 2014-08-17 - 2014-08-21 2014.

  • Frantzen, Marianne; Damsgård, Børge; Tveiten, Helge; Moriyama, Shunsuke; Iwata, Munehico; Johnsen, Helge K. 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. 5th International Symposium of Fish Endocrinology 2004-09-05 - 2004-09-09 2004.

  • Tveiten, Helge; Johnsen, Helge K.; Schulz, Rüdiger. 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 1999-07-04 - 1999-07-09 1999.

  • Member of research group