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Viser treff 1-49 av 49

2019
1 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). PLoS ONE 2019
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2018
2 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
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3 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. s. 96-104
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2017
4 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
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5 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. s. 1-11
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6 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. s. 158-163
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2016
7 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
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8 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. s. 196-208
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2015
9 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) s. 33-42
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2014
10 Jørgensen, Even Hjalmar; Johnsen, Helge K..
Rhythmic life of the Arctic charr: Adaptations to life at the edge. Marine Genomics 2014 ;Volum 14. s. 71-81
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11 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; 2014-08-17 - 2014-08-21
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12 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) s. 173-181
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13 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) s. 313-320
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14 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
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15 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
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16 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
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2011
17 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. s. 184-190
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2010
18 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) s. 2318-2341
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2009
19 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) s. 378-385
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2007
20 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) s. 205-256
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2005
21 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. s. 195-204
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2004
22 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. s. 561-574
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23 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. s. 1526-1542
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24 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
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25 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. s. 1526-1542
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2003
26 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. s. 135-148
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2001
27 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. s. 175-178
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28 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. s. 374-385
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2000
29 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. s. 177-188
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30 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. s. 464-473
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1999
31 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. s. 355-362
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32 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. s. 809-819
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33 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
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1998
34 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. s. 351-367
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35 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. s. 255-269
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36 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. s. 714-727
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1997
37 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) s. 697-709
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1996
38 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. s. 910-924
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1995
39 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. s. 157-165
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40 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. s. 265-166
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1992
41 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. s. 269-276
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1991
42 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) s. 351-355
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1988
43 Johnsen, Helge K.; Folkow, Lars.
Vascular control of brain cooling in reindeer.. American Journal of Physiology. Regulatory Integrative and Comparative Physiology 1988 ;Volum 254. s. 730-739
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1987
44 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. s. 848-853
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1985
45 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. s. 617-623
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46 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. s. 73-79
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47 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. s. 679-685
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1984
48 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. s. 963-967
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1983
49 Blix, Arnoldus S; Johnsen, Helge K..
Aspects of nasal heat exchange in resting reindeer.. Journal of Physiology 1983 ;Volum 340. s. 445-454
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