Arbeider i 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.

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