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Sigurd Stefansson

Professor
  • E-mailSigurd.Stefansson@uib.no
  • Phone+47 55 58 44 70+47 930 84 646
  • Visitor Address
    Thormøhlensgt. 53 A/B
  • Postal Address
    Postboks 7803
    5020 Bergen

Professor Sigurd O. Stefansson (December, 2017 ISI statistic 158, H-index 43) has long-term research experience in fish growth and development, reproduction and adaptation to the environment, both in salmonids and marine species, using a wide range of tools. Central in Stefansson’s research is the process of salmon smoltification, and his research includes both basic research and collaboration with the aquaculture industry. Research topics include the environmental, genetic and endocrine control of smoltification and basic mechanisms of adaptation to seawater.

Professional experience

Institute of Marine Research (IMR), Matre Aquaculture Station, Research fellow, Norwegian Fisheries Research Council 'Miljøforholdene i settefisk­produksjon', 07.1986 - 08.1988

Dept. of Fisheries Biology, UiB, Associate Professor (Amanuensis), 08.1988 - 06.1990

IMR, Matre Aquaculture Station, Senior Scientists, 01.07. - 31.12.1990

Dept. of Fisheries and Marine Biology, UiB, Associate professor 12.1990 – 03.2001

Department of Fisheries and Oceans, Biological Station, St. Andrews, Canada, post-doc. (Norwegian Fisheries Research Council), 05. - 12.1992

Dept. of Biology, UiB, Professor, 01.04.2001 – present

Univ. of Massachusetts at Amherst and Conte Anadromous Fish Research Center, Turners Falls, MA, USA, Sabbatical, 08.2003 – 07.2004

Completed Univ. of Bergen programme on teaching and pedagocics, 1994

Member of Dept. of Biology programme board for teaching (several appointments)

Chair of Education, Dept. of Biology, 2016

Chair of WP1 bioCEED, 2016

Head of the study programme “Havbruk og Sjømat” (Aquaculture and Seafood), 2016 – ongoing (integrated master/siv. ing.)

Courses

BIF 100 Innføring i fiskehelse og havbruk

Course responsible, teaching, assessment, quality assurance

BIF 101 Organismal Biology in Aquatic Medicine and Aquaculture

Course responsible, teaching, assessment, quality assurance

BIO 104 Comparative physiology

Course responsible, teaching, assessment, quality assurance

BIO 203 Introduction to Aquaculture

Teaching, assessment, quality assurance

BIO 291 Fish Biology II - Fish Physiology

Teaching, assessment, quality assurance

BIO 304 Specialisation in Aquaculture Biology

Teaching, assessment, quality assurance

Supervision

Cand. scient. and Master students:

43 students completed their degree, 3 currently under supervision

Dr. scient and PhD students:

12 students completed their degree, 3 students currently under supervision

Post-doc researchers:

3 finished

Journal articles
  • Calabrese, Sara; Nilsen, Tom Ole; Kolarevic, Jelena; Ebbesson, Lars O.E.; Pinto Pedrosa, Cindy; Fivelstad, Sveinung; Hosfeld, Anne-Camilla Diesen; Stefansson, Sigurd Olav; Terjesen, Bendik Fyhn; Takle, Harald Rune; Martins, Catarina I.M.; Sveier, Harald; Mathisen, Frode; Imsland, Albert Kjartanson; Handeland, Sigurd O. 2017. Stocking density limits for post-smolt Atlantic salmon (Salmo salar L.) emphasis on production performance and welfare. Aquaculture. 468, Part 1: 363-370. doi: 10.1016/j.aquaculture.2016.10.041
  • Imsland, Albert; Roth, Bjørn; Fjelldal, Per Gunnar; Stefansson, Sigurd Olav; Handeland, Sigurd O; Mikalsen, Bjørn. 2017. The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens. Aquaculture. 479: 645-651. doi: 10.1016/j.aquaculture.2017.07.014
  • Moore, Lindsey; Jarungsriapisit, Jiraporn; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Taranger, Geir Lasse; Secombes, Christopher J.; Morton, Hugh Craig; Patel, Sonal. 2017. Immune gene profiles in Atlantic salmon (salmo salar L.) post-smolts infected with SAV3 by bath-challenge show a delayed response and lower levels of gene transcription compared to injected fish. Fish and Shellfish Immunology. 62: 320-331. doi: 10.1016/j.fsi.2017.01.034
  • Moore, Lindsey; Nilsen, Tom Ole; Jarungsriapisit, Jiraporn; Fjelldal, Per Gunnar; Stefansson, Sigurd Olav; Taranger, Geir Lasse; Patel, Sonal. 2017. Triploid atlantic salmon (Salmo salar L.) postsmolts accumulate prevalence more slowly than diploid salmon following bath challenge with salmonid alphavirus subtype 3. PLoS ONE. 12:e0175468: 1-12. doi: 10.1371/journal.pone.0175468
  • Angotzi, Anna Rita; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Øvrebø, Jan Inge; Andersson, Eva; Taranger, Geir Lasse; Rønnestad, Ivar. 2016. Identification of a novel leptin receptor duplicate in Atlantic salmon: Expression analyses in different life stages and in response to feeding status. General and Comparative Endocrinology. 235: 108-119. doi: 10.1016/j.ygcen.2016.06.004
  • Døskeland, Inge; Imsland, Albert; Fjelldal, Per Gunnar; Stefansson, Sigurd Olav; Roth, Bjørn; Eriksen, Katrine Eikeland; Mikalsen, Bjørn; Handeland, Sigurd Olav. 2016. The effect of low temperatures and photoperiods on growth and vertebra morphometry in Atlantic salmon. Aquaculture International. 24: 1421-1434. doi: 10.1007/s10499-016-9999-7
  • Imsland, Albert; Pettersen, Kristian; Stefansson, Sigurd Olav. 2016. Growth and Smoltification of Three Norwegian Strains of Atlantic Salmon Salmo salar Reared under Different Thermal Regimes. Rivers Research and Applications: an international journal devoted to river research and management. 32: 1800-1807. doi: 10.1002/rra.3011
  • Jarungsriapisit, Jiraporn; Moore, Lindsey; Mæhle, Stig; Skår, Cecilie Kristin; Einen, Ann Cathrine B.; Fiksdal, Ingrid Uglenes; Morton, Hugh Craig; Stefansson, Sigurd Olav; Taranger, Geir Lasse; Patel, Sonal. 2016. Relationship between viral dose and outcome of infection in Atlantic salmon, Salmo salar L., post-smolts bath-challenged with salmonid alphavirus subtype 3. Veterinary research (Print). 47:102: 1-13. doi: 10.1186/s13567-016-0385-2
  • Jarungsriapisit, Jiraporn; Moore, Lindsey; Taranger, Geir Lasse; Nilsen, Tom Ole; Morton, Hugh Craig; Fiksdal, Ingrid Uglenes; Stefansson, Sigurd Olav; Fjelldal, Per Gunnar; Evensen, Øystein; Patel, Sonal. 2016. Atlantic salmon (Salmo salar L.) post-smolts challenged two or nine weeks after seawater-transfer show differences in their susceptibility to salmonid alphavirus subtype 3 (SAV3). Virology Journal. 13. 14 pages. doi: 10.1186/s12985-016-0520-8
  • Sveen, Lene; Timmerhaus, Gerrit; Torgersen, Jacob Seilø; Ytteborg, Elisabeth; Jørgensen, Sven Martin; Handeland, Sigurd Olav; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Calabrese, Sara; Ebbesson, Lars O.E.; Terjesen, Bendik Fyhn; Takle, Harald Rune. 2016. Impact of fish density and specific water flow on skin properties in Atlantic salmon (Salmo salar L.) post-smolts. Aquaculture. 464: 629-637. doi: 10.1016/j.aquaculture.2016.08.012
  • Vikingstad, Erik J.M; Andersson, Eva; Hansen, Tom Johnny; Norberg, Birgitta; Mayer, Ian; Stefansson, Sigurd Olav; Fjelldal, Per Gunnar; Taranger, Geir Lasse. 2016. Effects of temperature on the final stages of sexual maturation in Atlantic salmon (Salmo salar L.). Fish Physiology & Biochemistry. 42: 895-907. doi: 10.1007/s10695-015-0183-1
  • Nilsen, Tom Ole; Lukas, Juliane; Valen, Ragnhild; Helvik, Jon Vidar; Ebbesson, Lars O.E.; Rønnestad, Ivar; Hamre, Kristin; Handeland, Sigurd O; Stefansson, Sigurd Olav. 2015. Utvikling av osmoreguleringssystemet hos torskelarver startfôret på rotatorier eller naturlig zooplankton. Norsk Fiskeoppdrett. E1: 36-38.
  • Salmerón, Cristina; Johansson, Marcus; Asaad, Maryam; Angotzi, Anna Rita; Rønnestad, Ivar; Stefansson, Sigurd Olav; Jönsson, Elisabeth; Björnsson, Björn Thrandur; Gutiérrez, Joaquim; Navarro, Isabel; Capilla, Encarnación. 2015. Roles of leptin and ghrelin in adipogenesis and lipid metabolism of rainbow trout adipocytes in vitro. Comparative Biochemistry and Physiology A. 188: 40-48. doi: 10.1016/j.cbpa.2015.06.017
  • Calabrese, Sara; Handeland, Sigurd O; Terjesen, Bendik Fyhn; Fivelstad, Sveinung; Ebbesson, Lars O.E.; Nilsen, Tom Ole; Pedrosa, Cindy; Stefansson, Sigurd Olav; Imsland, Albert; Kolarevic, Jelena; Hosfeld, Camilla Diesen; Kvamme, Kristin; Grahl-Madsen, Elisabeth; Takle, Harald Rune; Breck, Olav; Lyngøy, Cato; Mathisen, Frode; Sveier, Harald. 2014. Krav til fisketetthet og vannforbruk. Norsk Fiskeoppdrett. 37: 42-50.
  • Einarsdóttir, Ingibjörg Eir; Gong, Ningping; Jönsson, Elisabeth; Sundh, Henrik; Hasselberg-Frank, Linda; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Sundell, Kristina Snuttan; Björnsson, Björn Thrandur. 2014. Plasma growth hormone-binding protein levels in Atlantic salmon Salmo salar during smoltification and seawater transfer. Journal of Fish Biology. 85: 1279-1296. doi: 10.1111/jfb.12473
  • Handeland, Sigurd O; Imsland, Albert; Ebbesson, Lars O.E.; Nilsen, Tom Ole; Hosfeld, Camilla Diesen; Teien, Hans-Christian; Stefansson, Sigurd Olav. 2014. Osmoregulation and growth in offspring of wild Atlantic salmon at different temperatures. Environmental Biology of Fishes. 97: 285-296. doi: 10.1007/s10641-013-0151-5
  • Handeland, Sigurd O; Imsland, Albert; Nilsen, Tom Ole; Ebbesson, Lars O.E.; Hosfeld, Camilla Diesen; Pinto Pedrosa, Cindy; Toften, Hilde; Stefansson, Sigurd Olav. 2014. Osmoregulation in Atlantic salmon Salmo salar smolts transferred to seawater at different temperatures. Journal of Fish Biology. 85: 1163-1176. doi: 10.1111/jfb.12481
  • Imsland, Albert; Handeland, Sigurd O; Stefansson, Sigurd Olav. 2014. Photoperiod and temperature effects on growth and maturation of pre- and post-smolt Atlantic salmon. Aquaculture International. 22: 1331-1345. doi: 10.1007/s10499-014-9750-1
  • Sundh, Henrik; Nilsen, Tom Ole; Lindström, Jenny; Hasselberg-Frank, Linda; Stefansson, Sigurd Olav; McCormick, Stephen D.; Sundell, Kristina Snuttan. 2014. Development of intestinal ion-transporting mechanisms during smoltification and seawater acclimation in Atlantic salmon Salmo salar. Journal of Fish Biology. 85: 1227-1252. doi: 10.1111/jfb.12531
  • Angotzi, Anna Rita; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Rathore, Raja Mansingh; Rønnestad, Ivar. 2013. Molecular cloning and genomic characterization of novel Leptin-like genes in salmonids provide new insight into the evolution of the Leptin gene family. General and Comparative Endocrinology. 187: 48-59. doi: 10.1016/j.ygcen.2013.03.022
  • Grassie, Cairsty; Braithwaite, Victoria Anne; Nilsson, Jonatan; Nilsen, Tom Ole; Teien, Hans-Christian; Handeland, Sigurd Olav; Stefansson, Sigurd Olav; Tronci, Valentina; Gorissen, Marnix; Flik, Gert; Ebbesson, Lars O.E. 2013. Aluminum exposure impacts brain plasticity and behavior in Atlantic salmon (Salmo salar). Journal of Experimental Biology. 216: 3148-3155. doi: 10.1242/jeb.083550
  • Handeland, Sigurd O; Imsland, Albert; Björnsson, Björn Thrandur; Stefansson, Sigurd Olav. 2013. Long-term effects of photoperiod, temperature and their interaction on growth, gill Na+, K+-ATPase activity, seawater tolerance and plasma growth-hormone levels in Atlantic salmon Salmo salar. Journal of Fish Biology. 83: 1197-1209. doi: 10.1111/jfb.12215
  • Handeland, Sigurd O; Imsland, Albert; Björnsson, Björn Thrandur; Stefansson, Sigurd Olav; Porter, Mark. 2013. Physiology during smoltification in Atlantic salmon: effect of melatonin implants. Fish Physiology & Biochemistry. 39: 1079-1088. doi: 10.1007/s10695-012-9765-3
  • Handeland, Sigurd O; Imsland, Albert; Ebbesson, Lars O.E.; Nilsen, Tom Ole; Hosfeld, Camilla Diesen; Bæverfjord, Grete; Espmark, Åsa Maria Olofsdotter; Rosten, Trond; Skilbrei, Ove Tommy; Hansen, Tom Johnny; Gunnarsson, Gunnar Steinn; Breck, Olav; Stefansson, Sigurd Olav. 2013. Low light intensity can reduce Atlantic salmon smolt quality. Aquaculture. 384: 19-24. doi: 10.1016/j.aquaculture.2012.12.016
  • Nilsen, Tom Ole; Ebbesson, Lars O.E.; Handeland, Sigurd O; Kroglund, Frode; Finstad, Bengt; Angotzi, Anna Rita; Stefansson, Sigurd Olav. 2013. Atlantic salmon (Salmo salar L.) smolts require more than two weeks to recover from acidic water and aluminium exposure. Aquatic Toxicology. 142: 33-44. doi: 10.1016/j.aquatox.2013.07.016
  • Urke, Henning Andre; Kristensen, Torstein; Arnekleiv, Jo Vegar; Haugen, Thrond Oddvar; Kjærstad, Gaute; Stefansson, Sigurd Olav; Ebbesson, Lars O.E.; Nilsen, Tom Ole. 2013. Seawater tolerance and post-smolt migration of wild Atlantic salmon Salmo salar × brown trout S. trutta hybrid smolts. Journal of Fish Biology. 82: 206-227. doi: 10.1111/j.1095-8649.2012.03481.x
  • Finstad, Bengt; Kroglund, Frode; Bjørn, Pål Arne; Nilsen, Rune; Pettersen, Kristian; Rosseland, Bjørn Olav; Teien, Hans-Christian; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Salbu, Brit; Fiske, Peder; Ebbesson, Lars. 2012. Salmon lice-induced mortality of Atlantic salmon postsmolts experiencing episodic acidification and recovery in freshwater. Aquaculture. 362-363: 193-199. doi: 10.1016/j.aquaculture.2010.10.037
  • Kling, Peter; Jönsson, Elisabeth; Nilsen, Tom Ole; Einarsdottir, Ingibjörg Eir; Rønnestad, Ivar; Stefansson, Sigurd Olav; Björnsson, Björn Thrandur. 2012. The role of growth hormone in growth, lipid homeostasis, energy utilization and partitioning in rainbow trout: Interactions with leptin, ghrelin and insulin-like growth factor I. General and Comparative Endocrinology. 175: 153-162. doi: 10.1016/j.ygcen.2011.10.014
  • Koedijk, Roland; Imsland, Albert; Folkvord, Arild; Stefansson, Sigurd Olav; Jonassen, Thor Magne; Foss, Atle. 2012. Larval rearing environment influences the physiological adaptation in juvenile Atlantic cod, Gadus morhua. Aquaculture International. 20: 467-479. doi: 10.1007/s10499-011-9478-0
  • Kroglund, Frode; Finstad, Bengt; Pettersen, Kristian; Teien, Hans-Christian; Salbu, Brit; Rosseland, Bjørn Olav; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Ebbesson, Lars O.E.; Nilsen, Rune; Bjørn, Pål Arne; Kristensen, Torstein. 2012. Recovery of Atlantic salmon smolts following aluminum exposure defined by changes in blood physiology and seawater tolerance. Aquaculture. 362-363: 232-240. doi: 10.1016/j.aquaculture.2011.04.041
  • Sandbakken, Mari; Ebbesson, Lars O.E.; Stefansson, Sigurd Olav; Helvik, Jon Vidar. 2012. Isolation and characterization of melanopsin photoreceptors of atlantic salmon (Salmo salar). Journal of Comparative Neurology. 520: 3727-3744. doi: 10.1002/cne.23125
  • Schreck, Carl B.; McCormick, Stephen D.; Björnsson, Björn Thrandur; Stefansson, Sigurd Olav; Ueda, Hiroshi. 2012. Introduction to the 8th International Workshop on Smoltification and a synthesis of major findings. Aquaculture. 362: 98-100. doi: 10.1016/j.aquaculture.2012.08.001
  • Stefansson, Sigurd Olav; Haugland, Monika; Björnsson, Björn Thrandur; McCormick, Stephen D.; Holm, Marianne; Ebbesson, Lars O.E.; Holst, Jens Christian; Nilsen, Tom Ole. 2012. Growth, osmoregulation and endocrine changes in wild Atlantic salmon smolts and post-smolts during marine migration. Aquaculture. 362: 127-136. doi: 10.1016/j.aquaculture.2011.07.002
  • Angotzi, Anna Rita; Mungpakdee, Sutada; Stefansson, Sigurd Olav; Male, Rune; Chourrout, Daniel. 2011. Involvement of Prop1 homeobox gene in the early development of fish pituitary gland. General and Comparative Endocrinology. 171: 332-340. doi: 10.1016/j.ygcen.2011.02.026
  • Björnsson, Björn Thrandur; Stefansson, Sigurd Olav; McCormick, Stephen D. 2011. Environmental endocrinology of salmon smoltification. General and Comparative Endocrinology. 170: 290-298. doi: 10.1016/j.ygcen.2010.07.003
  • Ebbesson, Lars O.E.; Nilsen, Tom Ole; Helvik, Jon Vidar; Tronci, Valentina; Stefansson, Sigurd Olav. 2011. Corticotropin-Releasing Factor Neurogenesis during Midlife Development in Salmon: Genetic, Environmental and Thyroid Hormone Regulation. Journal of neuroendocrinology (Print). 23: 733-741. doi: 10.1111/j.1365-2826.2011.02164.x
  • Gunnarsson, Snorri; Imsland, Albert; Árnason, Jón; Gústavsson, Arnþór; Arnarson, Ingolfur; Jónsson, Jón Kjartan; Foss, Atle; Stefansson, Sigurd Olav; Thorarensen, Helgi. 2011. Effect of rearing temperatures on the growth and maturation of Arctic charr (Salvelinus alpinus) during juvenile and on-growing periods. Aquaculture Research. 42: 221-229. doi: 10.1111/j.1365-2109.2010.02615.x
  • Imsland, Albert; Koedijk, Roland; Stefansson, Sigurd Olav; Foss, Atle; Hjorleifsdottir, Sigrid; Hreggvidsson, Gudmundur O.; Otterlei, Erling; Folkvord, Arild. 2011. A retrospective approach to fractionize variation in body mass of Atlantic cod Gadus morhua. Journal of Fish Biology. 78: 251-264. doi: 10.1111/j.1095-8649.2010.02860.x
  • Imsland, Albert; Våge, Klement Arild; Handeland, Sigurd O; Stefansson, Sigurd Olav. 2011. Growth and osmoregulation in Atlantic salmon (Salmo salar ) smolts in response to different feeding frequencies and salinities. Aquaculture Research. 42: 469-479. doi: 10.1111/j.1365-2109.2010.02640.x
  • Murashita, Koji; Jordal, Ann-Elise Olderbakk; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Kurokawa, Tadahide; Björnsson, Björn Thrandur; Moen, Anne-Grethe Gamst; Rønnestad, Ivar. 2011. Leptin reduces Atlantic salmon growth through the central pro-opiomelanocortin pathway. Comparative Biochemistry and Physiology A. 158: 79-86. doi: 10.1016/j.cbpa.2010.09.001
  • Hosfeld, Camilla Diesen; Handeland, Sigurd O; Fivelstad, Sveinung; Stefansson, Sigurd Olav. 2010. Physiological effects of normbaric environmental hyperoxia on Atlantic salmon (Salmo solar L.) presmolts. Aquaculture. 308: 28-33. doi: 10.1016/j.aquaculture.2010.08.003
  • Koedijk, Roland; Folkvord, Arild; Foss, Atle; Pittman, Karin; Stefansson, Sigurd Olav; Handeland, Sigurd O; Imsland, Albert. 2010. The influence of first-feeding diet on the Atlantic cod Gadus morhua phenotype: survival, development and long-term consequences for growth. Journal of Fish Biology. 77: 1-19. doi: 10.1111/j.1095-8649.2010.02652.x
  • Koedijk, Roland; Le François, Nathalie R.; Blier, Pierre U.; Foss, Atle; Folkvord, Arild; Ditlecadet, Delphine; Lamarre, Simon G.; Stefansson, Sigurd Olav; Imsland, Albert. 2010. Ontogenetic effects of diet during early development on growth performance, myosin mRNA expression and metabolic enzyme activity in Atlantic cod juveniles reared at different salinities. Comparative Biochemistry and Physiology A. 156: 102-109. doi: 10.1016/j.cbpa.2010.01.007
  • Kroglund, Frode; Finstad, Bengt; Pettersen, Kristian; Bjørn, P.A.; Teien, Hans-Christian; Salbu, Brit; Rosseland, Bjørn Olav; Nilsen, Tom O; Stefansson, Sigurd; Ebbesson, Lars; Nilsen, Rune; Kristensen, Torstein. 2010. Forsuringsskader og helbredningsstid for laksesmolt. ?. 1. 6-7.
  • Nilsen, Tom Ole; Ebbesson, Lars O.E.; Kverneland, Ole Gabriel; Kroglund, Frode; Finstad, Bengt; Stefansson, Sigurd Olav. 2010. Effects of acidic water and aluminum exposure on gill Na+, K+-ATPase alpha-subunit isoforms, enzyme activity, physiology and return rates in Atlantic salmon (Salmo salar L.). Aquatic Toxicology. 97: 250-259. doi: 10.1016/j.aquatox.2009.12.001
  • Nilsen, Tom Ole; Ebbesson, Lars O.E.; Kverneland, Ole Gabriel; Kroglund, Frode; Finstad, Bengt; Stefansson, Sigurd Olav. 2010. Ny metode kan påvise skader hos laksesmolt som er utsatt for aluminiumsrikt surt vann. pH-status : forum for sur nedbør og kalking. 4. 12-13.
  • Rønnestad, Ivar; Nilsen, Tom Ole; Murashita, Koji; Angotzi, Anna Rita; Moen, Anne-Grethe Gamst; Stefansson, Sigurd Olav; Kling, Peter; Björnsson, Björn Thrandur; Kurokawa, Tadahide. 2010. Leptin and leptin receptor genes in Atlantic salmon: Cloning, phylogeny, tissue distribution and expression correlated to long-term feeding status. General and Comparative Endocrinology. 168: 55-70. doi: 10.1016/j.ygcen.2010.04.010
  • Foss, Atle; Imsland, Albert; Roth, Bjørn; Schram, Edward; Stefansson, Sigurd Olav. 2009. Effects of chronic and periodic exposure to ammonia on growth and blood physiology in juvenile turbot (Scophthalmus maximus). Aquaculture. 296: 45-50. doi: 10.1016/j.aquaculture.2009.07.013
  • Foss, Atle; Imsland, Albert; Vikingstad, Erik J.M; Stefansson, Sigurd Olav; Norberg, Birgitta; Pedersen, Skjalg; Sandvik, Trond; Roth, Bjørn. 2009. Compensatory growth in Atlantic halibut: Effect of starvation and subsequent feeding on growth, maturation, feed utilization and flesh quality. Aquaculture. 290: 304-310. doi: 10.1016/j.aquaculture.2009.02.021
  • Hosfeld, Camilla Diesen; Hammer, Janicke; Handeland, Sigurd O; Fivelstad, Sveinung; Stefansson, Sigurd Olav. 2009. Effects of fish density on growth and smoltification in intensive production of Atlantic salmon (Salmo salar L.). Aquaculture. 294: 236-241. doi: 10.1016/j.aquaculture.2009.06.003
  • Hvidsten, N. A.; Jensen, AJ; Rikardsen, Audun; Finstad, B.; Aure, J.; Stefansson, S.; Fiske, P; Johnsen, B. O. 2009. Influence of sea temperature and initial marine feeding on survival of Atlantic salmon Salmo salar post-smolts from the Rivers Orkla and Hals, Norway. Journal of Fish Biology. 74: 1532-1548. doi: 10.1111/j.1095-8649.2009.02219.x
  • Imsland, Albert; Jenssen, Mads Dorenfeldt; Jonassen, Thor Magne; Stefansson, Sigurd Olav. 2009. Best among unequals? Effect of size grading and different social environments on the growth performance of juvenile Atlantic halibut. Aquaculture International. 17: 217-227. doi: 10.1007/s10499-008-9193-7
  • Imsland, Albert; Roth, Bjørn; Foss, Atle; Vikingstad, Erik J.M; Stefansson, Sigurd Olav; Pedersen, Skjalg; Sandvik, Trond; Norberg, Birgitta. 2009. Long-term effect of photoperiod manipulation on growth, maturation and flesh quality in Atlantic halibut. Aquaculture Research. 40: 1260-1269. doi: 10.1111/j.1365-2109.2009.02224.x
  • Kling, Peter; Rønnestad, Ivar; Stefansson, Sigurd Olav; Murashita, Koji; Kurokawa, Tadahide; Björnsson, Björn Thrandur. 2009. A homologous salmonid leptin radioimmunoassay indicates elevated plasma leptin levels during fasting of rainbow trout. General and Comparative Endocrinology. 162: 307-312. doi: 10.1016/j.ygcen.2009.04.003
  • Murashita, Koji; Kurokawa, Tadahide; Ebbesson, Lars O.E.; Stefansson, Sigurd Olav; Rønnestad, Ivar. 2009. Characterization, tissue distribution, and regulation of agouti-related protein (AgRP), cocaine- and amphetamine-regulated transcript (CART) and neuropeptide Y (NPY) in Atlantic salmon (Salmo salar). General and Comparative Endocrinology. 162: 160-171. doi: 10.1016/j.ygcen.2009.03.015
  • Stefansson, Sigurd Olav; Imsland, Albert; Handeland, Sigurd O. 2009. Food-deprivation, compensatory growth and hydro-mineral balance in Atlantic salmon (Salmo salar) post-smolts in sea water. Aquaculture. 290: 243-249. doi: 10.1016/j.aquaculture.2009.02.024
  • Angotzi, Anna Rita; Ersland, Kari Merete; Mungpakdee, Sutada; Stefansson, Sigurd; Chourrout, Daniel. 2008. Independent and dynamic reallocation of pitx gene expression during vertebrate evolution, with emphasis on fish pituitary development. Gene. 417: 19-26. doi: 10.1016/j.gene.2008.03.013
  • Ebbesson, Lars O.E.; Björnsson, Björn Thrandur; Ekström, Peter; Stefansson, Sigurd Olav. 2008. Daily endocrine profiles in parr and smolt Atlantic salmon. Comparative Biochemistry and Physiology A. 151: 698-704. doi: 10.1016/j.cbpa.2008.08.017
  • Handeland, Sigurd O; Imsland, Albert; Stefansson, Sigurd Olav. 2008. The effect of temperature and fish size on growth, feed intake, food conversion efficiency and stomach evacuation rate of Atlantic salmon post-smolts. Aquaculture. 283: 36-42. doi: 10.1016/j.aquaculture.2008.06.042
  • Handeland, Sigurd O; Urke, Henning Andre; Kristensen, Torstein; Rosten, Trond; Damsgård, Børge; Mikkelsen, Helene; Toften, Hilde; Evensen, Tor Hatten; Rosseland, Bjørn Olav; Salbu, Brit; Teien, Hans-Christian; Stefansson, Sigurd Olav. 2008. Påvirker vannkvalitet og produksjonsintensitet risiko for utvikling av vintersår hos postsmolt - Resultater fra en storskala feltstudie. ?. 1.
  • Hosfeld, Camilla Diesen; Annhild, Engevik; Mollan, Ted Andreas; Lunde, Torleif Markussen; Waagbø, Rune; Olsen, Anne Berit; Breck, Olav; Stefansson, Sigurd; Fivelstad, Sveinung. 2008. Long-term separate and combined effects of environmental hypercapnia and hyperoxia in Atlantic salmon (Salmo salar L.) smolts. Aquaculture. 280: 146-153. doi: 10.1016/j.aquaculture.2008.05.009
  • Hosfeld, Camilla Diesen; Engevik, Annhild; Mollan, Ted Andreas; Lunde, Torleif Markussen; Waagbø, Rune; Olsen, Anne Berit; Breck, Olav; Stefansson, Sigurd; Fivelstad, Sveinung. 2008. Long-term separate and combined effects of environmental hypercapnia and hyperoxia in Atlantic salmon (Salmo salar L.) smolts. Aquaculture. 280: 146-153. doi: 10.1016/j.aquaculture.2008.05.009
  • Imsland, Albert; Foss, Atle; Roth, Bjørn; Stefansson, Sigurd; Vikingstad, Erik J.M; Pedersen, Skjalg; Sandvik, Trond; Norberg, Birgitta. 2008. Plasma insulin-like growth factor-I concentrations and growth in juvenile halibut (Hippoglossus hippoglossus): Effects of photoperiods and feeding regimes. Comparative Biochemistry and Physiology A. 151: 66-70. doi: 10.1016/j.cbpa.2008.05.179
  • Kolding, Jeppe; Haug, Lise; Stefansson, Sigurd. 2008. Effect of ambient oxygen on growth and reproduction in Nile tilapia (Oreochromis niloticus). Canadian Journal of Fisheries and Aquatic Sciences. 65: 1413-1424. doi: 10.1139/F08-059
  • Moen, Anne-Grethe Gamst; Stefansson, Sigurd Olav; Jordal, Ann-Elise Olderbakk; Nilsen, Tom Ole; Kurokawa, T; Bjørnsson, B. T.; Rønnestad, Ivar. 2008. Nutritional status of Atlantic salmon (Salmo salar) broodstock. Maternal effects on early expression of leptin, IGF-I, IGF-IR, and GHR. Cybium (Paris). 32: 62-63.
  • Nilsen, Tom Ole; Ebbesson, Lars; Kiilerich, Pia; Björnsson, Björn Thrandur; Madsen, Steffen S.; McCormick, Stephen D.; Stefansson, Sigurd. 2008. Endocrine systems in juvenile anadromous and landlocked Atlantic salmon (Salmo salar): Seasonal development and seawater acclimation. General and Comparative Endocrinology. 155: 762-772. doi: 10.1016/j.ygcen.2007.08.006
  • Remen, Mette; Imsland, Albert; Stefansson, Sigurd; Jonassen, Thor Magne; Foss, Atle. 2008. Interactive effects of ammonia and oxygen on growth and physiological status of juvenile Atlantic cod (Gadus morhua). Aquaculture. 274: 292-299. doi: 10.1016/j.aquaculture.2007.11.032
  • Tipsmark, Christian K.; Kiilerich, Pia; Nilsen, Tom Ole; Ebbesson, Lars; Stefansson, Sigurd; Madsen, Steffen S. 2008. Branchial expression patterns of claudin isoforms in Atlantic salmon during seawater acclimation and smoltification. American Journal of Physiology. Regulatory Integrative and Comparative Physiology. 294: R1563-R1574. doi: 10.1152/ajpregu.00915.2007
  • Vikingstad, Erik J.M; Andersson, Eva; Norberg, Birgitta; Mayer, Ian; Klenke, Ulrike; Zohar, Yonathan; Stefansson, Sigurd Olav; Taranger, Geir Lasse. 2008. The combined effects of temperature and GnRHa treatment on the final stages of sexual maturation in Atlantic salmon (Salmo salar L.) females. Fish Physiology & Biochemistry. 34: 289-298. doi: 10.1007/s10695-007-9187-9
  • Ebbesson, Lars; Ebbesson, Sven O.E.; Nilsen, Tom Ole; Stefansson, Sigurd; Holmqvist, Bo. 2007. Exposure to continuous light disrupts retinal innervation of the preoptic nucleus during parr-smolt transformation in Atlantic salmon. Aquaculture. 273: 345-349. doi: 10.1016/j.aquaculture.2007.10.016
  • Finstad, Bengt; Kroglund, Frode; Strand, Rita; Stefansson, Sigurd; Bjørn, Pål Arne; Rosseland, Bjørn Olav; Nilsen, Tom Ole; Salbu, Brit. 2007. Salmon lice or suboptimal water quality - Reasons for reduced postsmolt survival? Aquaculture. 273: 374-383. doi: 10.1016/j.aquaculture.2007.10.019
  • Fivelstad, Sveinung; Waagbø, Rune; Stefansson, Sigurd; Olsen, Anne Berit. 2007. Impacts of elevated water carbon dioxide partial pressure at two temperatures on Atlantic salmon (Salmo salar L.) parr growth and haematology. Aquaculture. 269: 241-249. doi: 10.1016/j.aquaculture.2007.05.039
  • Fivelstad, Sveinung; Waagbø, Rune; Stefansson, Sigurd; Olsen, Anne Berit. 2007. Impacts of elevated water carbon dioxide partial pressure at two temperatures on Atlantic salmon (Salmo salar L.) parr growth and haematology. Aquaculture. 269: 241-249.
  • Foss, Atle; Imsland, Albert; Roth, Bjørn; Schram, Edward; Stefansson, Sigurd. 2007. Interactive effects of oxygen saturation blood physiology and ammonia on growth and in juvenile turbot. Aquaculture. 271: 244-251. doi: 10.1016/j.aquaculture.2007.06.025
  • Imsland, Albert; Björnsson, Björn Thrandur; Gunnarsson, Snorri; Foss, Atle; Stefansson, Sigurd. 2007. Temperature and salinity effects on plasma insulin-like growth factor-I concentrations and growth in juvenile turbot (Scophthalmus maximus). Aquaculture. 271: 546-552. doi: 10.1016/j.aquaculture.2007.07.007
  • Imsland, Albert; Foss, A; Koedijk, Roland; Folkvord, Arild; Stefansson, Sigurd; Jonassen, TM. 2007. Persistent growth effects of temperature and photoperiod in Atlantic cod Gadus morhua. Journal of Fish Biology. 71: 1371-1382. doi: 10.1111/j.1095-8649.2007.01600.x
  • Imsland, Albert; Foss, Atle; Alvseike, Thomas; Folkvord, Arild; Stefansson, Sigurd; Jonassen, Thor Magne. 2007. Interaction between temperature and photoperiod on growth and feeding of Atlantic cod (Gadus morhua): possible secondary effects. Canadian Journal of Fisheries and Aquatic Sciences. 64: 239-248. doi: 10.1139/F07-006
  • Imsland, Albert; Foss, Atle; Nævdal, Gunnar; Johansen, Torild; Stefansson, Sigurd; Jonassen, Thor Magne. 2007. New haemoglobin genotypes in Atlantic cod, Gadus morhua: Possible relation with growth. Comparative Biochemistry and Physiology A. 147: 955-960. doi: 10.1016/j.cbpa.2007.03.001
  • Kroglund, Frode; Finstad, Bengt; Stefansson, Sigurd; Nilsen, Tom Ole; Kristensen, Torstein; Rosseland, Bjørn Olav; Teien, Hans-Christian; Salbu, Brit. 2007. Exposure to moderate acid water and aluminum reduces Atlantic salmon post-smolt survival. Aquaculture. 273: 360-373. doi: 10.1016/j.aquaculture.2007.10.018
  • Nilsen, Tom Ole; Ebbesson, Lars; Madsen, Steffen S.; McCormick, Stephen D.; Andersson, Eva; Bjørnsson, Bjørn Th.; Prunet, Patrick; Stefansson, Sigurd. 2007. Differential expression of gill Na+,K+-ATPase alpha- and beta-subunits, Na+,K+,2Cl(-) cotransporter and CFTR anion channel in juvenile anadromous and landlocked Atlantic salmon Salmo salar. Journal of Experimental Biology. 210. doi: 10.1242/jeb.002873
  • Stefansson, Sigurd; Nilsen, Tom Ole; Ebbesson, Lars; Wargelius, Anna; Madsen, Steffen S.; Björnsson, Björn Thrandur; McCormick, Stephen D. 2007. Molecular mechanisms of continuous light inhibition of Atlantic salmon parr-smolt transformation. Aquaculture. 273: 235-245. doi: 10.1016/j.aquaculture.2007.10.005
  • Stefansson, Sigurd; Nilsen, Tom Ole; Ebbesson, Lars; Wargelius, Anna; Madsen, Steffen S.; Bjørnsson, Bjørn Th.; McCormich, Stephen D. 2007. Molecular mechanisms of contiuous light inhibition of Atlantic salmon parr-smolt transformation. Aquaculture. 273: 235-245. doi: 10.1016/j.aquaculture.2007.10.005
  • Bakke-McKellep, A.M.; Refstie, Ståle; Stefansson, Sigurd; Vanthanouvong, V.; Roomans, G.; Hemre, G.I.; Krogdahl, Å. 2006. Effects of dietary soybeanmeal and photoperiod cycle on osmoregulation following seawater exposure in Atlantic salmon smolts. Journal of Fish Biology. 69: 1396-1426.
  • Heide, Andreas; Foss, Atle; Stefansson, Sigurd; Mayer, Ian; Norberg, Birgitta; Roth, Bjørn; Jenssen, Mads D.; Nortvedt, Ragnar; Imsland, Albert. 2006. Compensatory growth and fillet crude composition in juvenile Atlantic halibut: Effects of short term starvation periods and subsequent feeding. Aquaculture. 261: 109-117. doi: 10.1016/j.aquaculture.2006.06
  • Imsland, Albert; Foss, A.; Folkvord, Arild; Stefansson, Sigurd; Jonassen, T.M. 2006. The interrelation between temperature regimes and fish size in juvenilie Atlantic cod (Gadus morhua). effects on growth and feed conversion efficiency. Fish Physiology & Biochemistry. 31: 347-361. doi: 10.1007/s10695-005-4244-8
  • Imsland, Albert; Foss, Atle; Koedijk, Roland; Folkvord, Arild; Stefansson, Sigurd; Jonassen, Thor M. 2006. Short- and long-term differences in growth, feed conversion efficiency and deformities in juvenile Atlantic cod (Gadus morhua) startfed on rotifers or zooplankton. Aquaculture Research. 37: 1015-1027.
  • Imsland, Albert; Foss, Atle; Stefansson, Sigurd; Mayer, Ian; Norberg, Birgitta; Roth, Bjørn; Jenssen, Mads D. 2006. Growth, feed conversion efficiency and growth heterogeneity in Atlantic halibut (Hippoglossus hippoglossus) reared at three different photoperiods. Aquaculture Research. 37: 1099-1106. doi: Se sammendrag
  • Imsland, Albert; Wergeland, Trond; Jonassen, Thor Magne; Stefansson, Sigurd. 2006. Does malpigmentation improve growth in juvenile turbot (Scophthalmus maximus Rafinesque) and halibut (Hippoglossus hippoglossus L.)? Aquaculture Research. 37: 306-312. doi: Se sammendrag
  • Ebbesson, Lars; Tipsmark, Christian K.; Holmqvist, Bo; Nilsen, Tom Ole; Andersson, Eva Mareile; Stefansson, Sigurd; Madsen, Steffen S. 2005. Nitric oxide synthase in the gill of Atlantic salmon: colocalization with and inhibition of Na+,K+-ATPase. Journal of Experimental Biology. 208: 1011-1017. doi: 10.1242/jeb.01488
  • Imsland, Albert; Foss, Atle; Folkvord, Arild; Stefansson, Sigurd. 2005. Genotypic response to photoperiod treatment in Atlantic cod (Gadus morhua). Aquaculture. 250: 525-532.
  • Imsland, Albert; Foss, Atle; Folkvord, Arild; Stefansson, Sigurd; Jonassen, Thor Magne. 2005. The interrelation between temperature regimes and fish size in juvenile Atlantic cod (Gadus morhua): effects on growth and feed conversion efficiency. Fish Physiology & Biochemistry. 31: 347-361. doi: 10.10077s10695-005-4244-8
  • Toften, Hilde; Johansen, Lill-Heidi; Sommer, Ann-Inger; Damsgård, Børge; Arnesen, Arne Mikal; Stefansson, Sigurd; Handeland, Sigurd O.; Kristensen, Torstein; Rosseland, Bjørn Olav; Salbu, Brit; Fivelstad, Sveinung; Lemarie, G. 2005. Intensive rearing and welfare in juvenile Atlantic salmon. ?. 449-450.
  • Andersson, E; Kumar, SR; Ackers, J; Taranger, GL; Stefansson, Sigurd; Trant, JM. 2004. Photoperiod and temperature affects seasonal ovarian gene expression of p450 aromatase and gonadotropin receptors in Atlantic Salmon (Salmo salar L.) broodstock. Fish Physiology & Biochemistry. 28: 411-411.
  • Dyrøy, Endre; Hvattum, Erlend; Thomassen, Magny Skinlo; Moya-Falcon, Corina; Skorve, Jon; Stefansson, Sigurd; Jakobsen, Jan Vidar; Berge, Rolf; Ruyter, Bente. 2004. Effects of 3-thia fatty acids on feed intake,growth, tissue fatty acid composition, beta-oxidation and Na,K-ATPase activity in Atlantic salmon. ?. 139: 657-668.
  • Fivelstad, S; Olsen, AB; Stefansson, Sigurd; Handeland, Sigurd O; Waagbo, R; Kroglund, F; Colt, J. 2004. Lack of long-term sublethal effects of reduced freshwater pH alone on Atlantic salmon (Salmo salar) smolts subsequently transferred to seawater. Canadian Journal of Fisheries and Aquatic Sciences. 61: 511-518.
  • Graff, IE; Stefansson, Sigurd; Aksnes, Lage; Lie, O. 2004. Plasma levels of vitamin D-3 metabolites during parr-smolt transformation of Atlantic salmon Salmo salar L. Aquaculture. 240: 617-622.
  • Handeland, Sigurd O; Wilkinson, E; Sveinsbo, B; McCormick, SD; Stefansson, Sigurd. 2004. Temperature influence on the development and loss of seawater tolerance in two fast-growing strains of Atlantic salmon. Aquaculture. 233: 513-529.
  • Imsland, Albert; Foss, Atle; Nævdal, Gunnar; Johansen, T.; Folkvord, Arild; Stefansson, Sigurd; Jonassen, Thor M. 2004. Variations in growth in haemoglobin genotypes of Atlantic cod. Fish Physiology & Biochemistry. 30: 47-55.
  • Kulczykowska, Ewa; Solokowska, Ewa; Takvam, Børge; Stefansson, Sigurd; Ebbesson, Lars. 2004. Influence of exogenous thyroxine on plasma melatonin in juvenile Atlantic salmon (Salmo salar). Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. 137: 43-47.
  • Moya-Falcón, Corina; Hvattum, E; Dyrøy, Endre; Skorve, Jon; Stefansson, Sigurd; Thomassen, Magny S.; Jakobsen, JV; Berge, Rolf Kristian; Ruyter, B. 2004. Effects of 3-thia fatty acids on feed intake, growth, tissue fatty acid composition, beta-oxidation and Na+,K+-ATPase activity in Atlantic salmon. Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. 139: 657-658. doi: 10.1016/j.cbpc.2004.08.009
  • Taranger, GL; Vikingstad, Erik J.M; Klenke, U; Mayer, Ian; Stefansson, Sigurd; Norberg, Birgitta; Hansen, Tone; Zohar, Y; Andersson, E. 2004. Effects of photoperiod, temperature and GnRHa treatment on the reproductive physiology of Atlantic salmon (Salmo salar L.) broodstock. Fish Physiology & Biochemistry. 28: 403-406.
  • Arnesen, Arne Mikal; Toften, Hilde; Agustsson, Thorleifur; Stefansson, Sigurd Olav; Handeland, Sigurd O; Björnsson, Björn Thrandur. 2003. Osmoregulation, feed intake, growth and growth hormone levels in 0+ Atlantic salmon (Salmo salar L.) transferred to seawater at different stages of smolt development. Aquaculture. 222: 167-187. doi: 10.1016/S0044-8486(03)00109-1
  • Ebbesson, Lars O. E.; Ekström, Peter; Ebbesson, Sven; Stefansson, Sigurd; Holmqvist, Bo. 2003. Neural circuits and their structural and chemical reorganization in the light-brain-pituitary axis during parr-smolt transformation in salmon. Aquaculture. 222: 59-70.
  • Fivelstad, Sveinung; Olsen, Anne Berit; Åsgård, Torbjørn Einar; Bæverfjord, Grete; Rasmussen, Tim; Vindheim, Tore; Stefansson, Sigurd. 2003. Long-term sublethal effects of carbon dioxide on Atlantic salmon smolts (Salmo salar L): ion regulation, haematology, element composition, nephrocalcinosis and growth parameters. Aquaculture. 215: 301-319. doi: 10.1016/S0044-8486(02)00048-0
  • Fivelstad, Sveinung; Waagbø, Rune; Zeitz, Solveig F; Hosfeld, Anne Camilla Diesen; Olsen, Anne Berit; Stefansson, Sigurd. 2003. A major water quality problem in smolt farms: combined effects of carbon dioxide, reduced pH and aluminium on Atlantic Salmon (Salmo salar L) smolts: physiology and growth. Aquaculture. 215: 339-357.
  • Ham, Erich H. van; BERNTSSEN, MARC; Imsland, Albert K.; Parpoura, Alkistis C.; Bonga, Sjoerd E. Wendelaar; Stefansson, Sigurd. 2003. The influence of temperature and ration on growth, feed conversion, body composition and nutrient retention of juvenile turbot (Scophthalmus maximus). Aquaculture. 217: 547-558.
  • Handeland, S.O.; Björnsson, Björn Thrandur; Arnesen, Arne Mikal; Stefansson, Sigurd Olav. 2003. Seawater adaptation and growth of post-smolt Atlantic salmon (Salmo salar) of wild and farmed strains. Aquaculture. 220: 367-384. doi: 10.1016/S0044-8486(02)00508-2
  • Imsland, Albert Kjartansson; Dragsnes, Morten; Stefansson, Sigurd. 2003. Exposure to continuous light inhibits maturation in turbot (Scophthalmus maximus). Aquaculture. 219: 911-919.
  • Imsland, Albert Kjartansson; Gunnarsson, Snorri; Foss, Atle; Stefansson, Sigurd. 2003. Gill Na+, K+-ATPase activity, plasma chloride and osmolality in juvenile turbot (Scophthalmus maximus) reared at different temperatures and salinities. Aquaculture. 218: 671-683.
  • Nilsen, Tom Ole; Ebbesson, Lars O. E.; Stefansson, Sigurd. 2003. Smolting in anadromous and landlocked strains of Atlantic salmon (Salmo salar). Aquaculture. 222: 71-82.
  • Handeland, Sigurd O.; Stefansson, Sigurd. 2002. Effects of salinity acclimation on pre-smolt growth, smolting and post-smolt performance in off-season Atlantic salmon smolts (Salmo salar L.). Aquaculture. 209: 125-137.
  • Hoare, R.; Hovland, H.; Langston, A.L.; Imsland, A.; Stefansson, Sigurd; Mulcahy, M.; Wergeland, Heidrun Inger. 2002. Susceptibility of three different strains of juvenile Atlantic halibut (Hippoglossus hippoglossus L.) cultured at two different temperatures to Vibrio anguillarum and temperature effect on antibody response. Fish and Shellfish Immunology. 13: 111-123.
  • Imsland, A. K.; Foss, A.; Bonga, S. W.; van Ham, E.; Stefansson, Sigurd. 2002. Comparison of growth and RNA : DNA ratios in three populations of juvenile turbot reared at two salinities. Journal of Fish Biology. 60: 288-300.
  • Imsland, A. K.; Jonassen, Thor M.; Langston, A.L.; Hoare, R.; Wergeland, Heidrun Inger; Fitzgerald, R.; Mulcahy, M.; Stefansson, Sigurd. 2002. The interrelation of growth and disease resistance of different populations of juvenile Atlantic halibut (Hippoglossus hippoglossus L.). Aquaculture. 204: 167-177.
  • Andersson, Eva; Fjelldal, Per Gunnar; Klenke, Ulrike; Vikingstad, Erik J.M; Taranger, Geir Lasse; Zohar, Yonathan; Stefansson, Sigurd. 2001. Three forms of GnRH in the brain and pituitary of the turbot, Scophtalmus maximus: immunological characterization and seasonal variation. Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. 129: 551-558.
  • Andreassen, P.M.R.; Martinussen, M.B.; Hvidsten, N.A.; Stefansson, Sigurd. 2001. Feeding and prey-selection of wild Atlantic salmon post-smolts. Journal of Fish Biology. 58: 1667-1679.
  • Ebbesson, Lars O. E.; Björnsson, B.Th.; Ekström, P.; Stefansson, Sigurd. 2001. Daily profiles of plasma free thyroxine, total thyroxine, total triiodothyronine, and growth hormone in Atlantic salmon parr and smolts. Fish Physiology & Biochemistry.
  • Handeland, Sigurd O.; Stefansson, Sigurd. 2001. Photoperiod control and influence of body size on off-season parr-smolt transformation and post-smolt growth. Aquaculture. 192: 291-307.
  • Imsland, A.K.; Foss, A.; Gunnarsson, S.; Berntssen, M.H.G.; Fitzgerald, R.; Wendelar-Bonga, S.E.; van Ham, E.; Nævdal, Gunnar; Stefansson, Sigurd. 2001. The interaction of temperature and salinity on growth and food conversion in juvenile turbot (Scophthalmus maximus). Aquaculture. 198: 353-367.
  • Imsland, A.K.; Foss, A.; Stefansson, Sigurd. 2001. Variation in food intake, food conversion efficiency and growth of juvenile turbot from different geographic strains. Journal of Fish Biology. 59: 449-454.
  • Imsland, A.K.; Foss, A.; Sveinsbø, B.; Jonassen, Thor M.; Stefansson, Sigurd. 2001. Comparisons of RNA/DNA ratios, growth and metabolism of different populations of juvenile turbot Scophthalmus maximus reared at four temperatures. Journal of the World Aquaculture Society. 32: 1-10.
  • Imsland, Albert Kjartansson; Foss, Atle; Nævdal, Gunnar; Stefansson, Sigurd. 2001. Selection or adaptation: Differences in growth performance of juvenile turbot (Scophthalmus maximus Rafinesque) from two close-by localities off Norway. Sarsia. 86: 43-51.
  • Imsland, Albert; Foss, Atle; Nævdal, Gunnar; Stefansson, Sigurd. 2001. Selection or adaptation: Differences in growth performance of juvenile turbot (Scophthalmus maximus Rafinesque) from two close-by localities off Norway. Sarsia. 86: 43-51.
  • Porter, M.J.R.; Duncan, N.; Handeland, Sigurd O.; Stefansson, Sigurd; Bromage, N.R. 2001. Temperature, light intensity and plasma melatonin levels in juvenile Atlantic salmon. Journal of Fish Biology. 58. 431-438.
  • Ebbesson, Lars O. E.; Björnsson, B Th; Stefansson, Sigurd; Ekström, P. 2000. Free plasma thyroxine levels in coho salmon, Oncorhynchus kisutch, during parr-smolt transformation: comparison with total thyroxine, total triiodothyronine and growth hormone levels. Fish Physiology & Biochemistry. 22: 45-50.
  • Endal, H.P.; Taranger, GL; Stefansson, Sigurd; Hansen, T. 2000. Effects of continuous additional light on growth and sexual maturity in Atlantic salmon, Salmo salar, reared in sea cages. Aquaculture. 191: 337-349.
  • Handeland, Sigurd O.; Berge, Åse Ingvild; Bjørnsson, Bjørn Th.; Stefansson, Sigurd. 2000. Seawater adaptation of Atlantic salmon (Salmo salar L.) at different temperatures. Aquaculture, 181: 377-396. Aquaculture. 181: 377-396.
  • Imsland, Albert K; Foss, A.; Stefansson, Sigurd; Nævdal, Gunnar. 2000. Hemoglobin genotypes of turbot (Schophthalmus maximus): consequences for growth and variations in optimal temperature for growth. Fish Physiology & Biochemistry. 23: 75-81.
  • Imsland, Albert Kjartansson; Foss, A.; Kadowaki, S.; Berntssen, M.; Stefansson, Sigurd. 2000. Intraspecific differences in physiological efficiency of juvenile Atlantic halibut Hippoglossus hippoglossus L. Journal of the World Aquaculture Society. 31: 285-296.
  • Imsland, Albert Kjartansson; Foss, A.; Nævdal, Gunnar; Cross, T.; Wendelar-Bonga, SE; Ham, E. van; Stefansson, Sigurd. 2000. Countergradient variation in growth and growth efficiency of juvenile turbot. Journal of Fish Biology. 57: 1213-1226.
  • Imsland, Albert Kjartansson; Foss, A.; Sveinsbø, B; Jonassen, Thor M.; Stefansson, Sigurd. 2000. RNA/DNA ratios, growth and metabolism of different populations of juvenile turbot Scophthalmus maximus reared at four temperatures. Journal of the World Aquaculture Society.
  • Jonassen, Thor M.; Imsland, Albert Kjartansson; Fitzgerald, R.; Bonga, S.W.; Ham, E. van; Nævdal, Gunnar; Stefánsson, MÖ; Stefansson, Sigurd. 2000. Geographic variation in growth and food conversion efficiency of juvenile Atlantic halibut related to latitude. Journal of Fish Biology. 56: 279-294.
  • Jonassen, Thor M.; Imsland, Albert Kjartansson; Kadowaki, S.; Stefansson, Sigurd. 2000. Interaction of temperature and photoperiod on growth of Atlantic halibut Hippoglossus hippoglossus L. Aquaculture Research. 31: 219-227.
  • Porter, Mark; Stefansson, Sigurd Olav; Nyhammer, Gunnar; Karlsen, Ørjan; Norberg, Birgitta; Bromage, Nial. 2000. Environmental influences on melatonin secretion in Atlantic cod (Gadus morhua L.) and their relevance to commercial culture. Fish Physiology & Biochemistry. 23: 191-200. doi: 10.1023/A:1007816426509
  • Simensen, L.; Jonassen, Thor M.; Imsland, Albert Kjartansson; Stefansson, Sigurd. 2000. Growth of juvenile halibut (Hippoglossus hippoglossus) under different photoperiods. Aquaculture. 190: 119-128.
  • Stefánsson, MÖ; Imsland, Albert Kjartansson; Jenssen, M.D.; Jonassen, Thor M.; Stefansson, Sigurd; Fitzgerald, R. 2000. The effect of different initial size distribution on the growth of Atlantic halibut (Hippoglossus hippoglossus L.). Journal of Fish Biology. 56: 826-836.
  • Fivelstad, Sveinung; Olsen, Anne Berit; Kløften, Hilde; Ski, Hanne; Stefansson, Sigurd. 1999. Effects of carbon dioxide on Atlantic salmon (Salmo salar L. ) smolts at constant pH in bicarbonate rich freshwater. Aquaculture. 178: 171-187.
  • Otterlei, Erling; Nyhammer, Gunnar; Folkvord, Arild; Stefansson, Sigurd. 1999. Temperature- and size-dependent growth of larval and early juvenile Atlantic cod (Gadus morhua): a comparative study of Norwegian coastal cod and northeast Arctic cod. Canadian Journal of Fisheries and Aquatic Sciences. 56: 2099-2111.
  • Taranger, Geir Lasse; Haux, C.; Hansen, Tom Johnny; Stefansson, Sigurd Olav; Bjørnsson, Bjørn Thrandur; Walther, Bernt T.; Kryvi, Harald. 1999. Mechanisms underlying photoperiodic effects on age at sexual maturity in Atlantic salmon, Salmo salar. Aquaculture. 177: 47-60.
  • Fivelstad, Sveinung; Olsen, Anne Berit; Zeitz, Solveig; Hosfeld, Camilla Diesen; Kløften, Hilde; Ski, Hanne; Rasmussen, Tim; Vidheim, Tore; Stefansson, Sigurd. 1998. Effekter av karbondioksyd på laksesmolt. Norsk Fiskeoppdrett. 16. 40-41.
  • Sunde, Leif M.; Imsland, Albert; Folkvord, Arild; Stefansson, Sigurd. 1998. Effects of size grading on growth and survival of juvenile turbot at two temperatures. Aquaculture International. 6: 19-32.
  • Taranger, Geir Lasse; Haux, C.; Stefansson, Sigurd Olav; Bjørnsson, Bjørn Thrandur; Walther, Bernt T.; Hansen, Tom Johnny. 1998. Abrupt changes in photoperiod affect age at maturity, timing of ovulation and plasma testosterone and oestradiol-17 profiles in Atlantic salmon, Salmo salar. Aquaculture. 162: 85-98.
  • Imsland, Albert; Folkvord, Arild; Jónsdóttir, Ólöf D.B.; Stefansson, Sigurd. 1997. Effects of exposure to extended photoperiods during the first winter on long-term growth and age at first maturity in turbot (Scophthalmus macimus). Aquaculture. 159: 125-141.
  • Berge, Åse Ingvill; Berg, Arne; Fyhn, Hans Jørgen; Barnung, Trygg; Hansen, Tom; Stefansson, Sigurd. 1995. Development of salinity tolerance in underyearling smolts of Atlantic salmon (Salmo salar) reared under different photoperiods. Canadian Journal of Fisheries and Aquatic Sciences. 52: 243-251.
  • Berge, Åse Ingvill; Berg, Arne; Fyhn, Hans Jørgen; Barnung, Trygg; Hansen, Tom; Stefansson, Sigurd. 1995. Development of salinity tolerance in underyearling smolts of Atlantic salmon (Salmo salar) reared under different photoperiods. Canadian Journal of Fisheries and Aquatic Sciences. 52: 243-251.
  • Björnson, B. T.; Stefansson, Sigurd; Hansen, T. 1995. Photoperiod Regulation of Plasma Growth Hormone Levels during Parr-Smolt Transformation of Atlantic Salmon: Implications for Hypoosmoregulatiory Ability and Growth. General and Comparative Endocrinology. 100: 73-82.
  • Hallaråker, H.; Folkvord, Arild; Stefansson, Sigurd. 1995. Growth of juvenile halibut (Hippoglossus hippoglossus L.) related to temperature, day length and feeding regime. Netherlands Journal of Sea Research. 34: 139-147.
  • Imsland, A. K.; Folkvord, Arild; Stefansson, Sigurd. 1995. Growth, oxygen consumption and activity of juvenile turbot (Scophthalamus maximus) reared under different temperatures and photoperiods. Netherlands Journal of Sea Research. 34: 149-159.
  • Melingen, G. O.; Stefansson, Sigurd; Berg, A.; Wergeland, Heidrun Inger. 1995. Changes in serum protein and IgM concentration during smolting and early post-smolt period in vaccinated and unvaccinated Atlantic salmon (Salmo salar L.). Fish and Shellfish Immunology. 5: 211-221.
  • Berg, A.; Stefansson, Sigurd; Hansen, T. 1994. Effect of a simulated winter of different duration on growth and smoltification in Atlantic salmon (Salmo salar) underyearlings (Abstract). Aquaculture. 121: 294.
  • Berg, Arne Erik; Stefansson, Sigurd Olav; Hansen, Tom Johnny. 1994. Effect of reduced daylength on growth, sexual maturation and smoltification in Atlantic salmon (Salmo salar) underyearlings. Aquaculture. 121: 289-230.
  • Bjørnsson, B. Th.; Taranger, G. L.; Hansen, T.; Stefansson, Sigurd; Haux, C. 1994. The interrelation between photo-period, growth hormone, and sexual maturation of adult Atlantic salmon (Salmo salar). General and Comparative Endocrinology. 93: 70-81.
  • Lyse, A. A.; Stefansson, Sigurd; Fernø, Anders. 1994. Predation and dietary habits as possible explanations for poor return rates of stocked seatrout from the river Aurland. Norsk Geografisk Tidsskrift. 48: 51-53.
  • Solbakken, V. A.; Hansen, T.; Stefansson, Sigurd. 1994. Effects of photoperiod and temperature on growth and parr-smolt transformation in Atlantic salmon (Salmo salar L.) and subsequent performance in seawater. Aquaculture. 121: 13-27.
  • Stefansson, Sigurd. 1993. Kultivering av atlantisk laks i Nordamerika. Laks & Miljø. 2. 39-44.
  • Stefansson, Sigurd. 1993. Smolten - et nøkkelstudium i livssyklus til laks. Laks & Miljø. 1. 23-27.
  • Stefansson, Sigurd; Hansen, Tom; Taranger, Geir Lasse. 1993. Growth and Parr-smolt tranformation of Atlantic Salmon (Salmo salar L.) under different light intensities and subsequent survival and growth in seawater. Aquacultural Engineering. 13: 231-243.
  • Berg, A.; Hansen, T.; Stefansson, Sigurd. 1992. First feeding of Atlantic salmon (Salmo salar L.) under different photoperiods. J Appl Ichtyol. 8: 251-256.
  • Hansen, T.; Stefansson, Sigurd; Taranger, G. L. 1992. Growth and sexual maturation in Atlantic salmon, Salmo salar L. reared in sea cages at two different light regimes. Aquaculture and Fisheries Management. 23: 275-280.
  • Hansen, Tom Johnny; Stefansson, Sigurd Olav; Taranger, Geir Lasse. 1992. Advancement and synchronization of ovulation in Atlantic salmon (Salmo salar L.) following injections of LHRH analogue. Aquaculture. 102: 169-175.
  • Saunders, R.L.; Berg, Arne Erik; Hansen, Tom Johnny; Stefansson, Sigurd Olav. 1992. The potential for development of salinity tolerance in underyearling Atlantic salmon (Salmo salar). Journal of the World Aquaculture Society. 23: 52-55.
  • Stefansson, Sigurd; Berg, A. E.; Hansen, T.; Saunders, R. L. 1992. The potential for development of salinity tolerance in underyearling Atlantic salmon (Salmo salar L.). World Aquaculture. 23: 52-55.
  • Berg, Arne Erik; Hansen, Tom Johnny; Stefansson, Sigurd Olav. 1991. First feeding of Atlantic salmon (Salmo salar) under different photoperiods. Journal of Applied Ichthyology. 8: 251-256.
  • Hansen, Tom Johnny; Stefansson, Sigurd Olav; Taranger, Geir Lasse. 1991. Growth and sexual maturation in Atlantic salmon (Salmo salar) reared in sea cages at two different light regimes. Aquaculture and Fisheries Management. 23: 275-280.
  • Kråkenes, R.; Hansen, T.; Stefansson, Sigurd; Taranger, G. L. 1991. Continous light increases growth of Atlantic salmon (Salmo salar) postsmolts in seacages. Aquaculture. 95: 281-287.
  • Stefansson, Sigurd; Bjørnsson, T.; Hansen, T.; Haux, C.; Taranger, G. L.; Saunders, R. L. 1991. Growth, parr-smolt transformation and changes in growth hormone of Atlantic salmon (Salmo salar) reared under different photoperiods. Canadian Journal of Fisheries and Aquatic Sciences. 48: 2100-2108.
  • Stefansson, Sigurd Olav; Nortvedt, Ragnar; Hansen, Tom Johnny; Taranger, Geir Lasse. 1990. First feeding of Atlantic salmon, Salmo salar L., under different photoperiods and light intensities. Aquaculture and Fisheries Management. 21: 435-441.
  • Stefansson, Sigurd Olav; Hansen, Tom Johnny. 1989. Effects of tank colour on growth and smoltification of Atlantic salmon (Salmo salar L.). Aquaculture. 82: 379-386.
  • Stefansson, Sigurd Olav; Hansen, Tom Johnny. 1989. The effect of spectral composition on growth and smoltification in Atlantic salmon (Salmo salar) and subsequent growth i sea cages. Aquaculture. 82: 155-162.
  • Stefansson, Sigurd Olav; Hansen, Tom Johnny; Nævdal, Gunnar. 1989. The influence of three unchanging photoperiods on growth and parr-smolt transformation i Atlantic salmon, (Salmo salar L.). Journal of Fish Biology. 35: 237-247.
  • Stefansson, Sigurd Olav; Hansen, Tom Johnny; Nævdal, Gunnar. 1989. Growth of different families of Atlantic salmon (Salmo salar) under three experimental photperiods. Aquaculture. 86: 271-281.
Reports and theses
  • Kroglund, Frode; Høgberget, Rolf; Haraldstad, Tormod; Økland, Finn; Thorstad, Eva Bonsak; Teien, Hans-Christian; Rosseland, Bjørn Olav; Salbu, Brit; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Guttrup, Jim. 2011. Påvirkes laksesmolt av aluminium i brakkvann? Telemtriundersøkelser Storelva i Holt, Aust-Agder, 2008. NIVA-rapport. 6246. Norsk institutt for vannforskning, Oslo. 69 pages.
  • Kroglund, Frode; Høgberget, Rolf; Haraldstad, Tormod; Økland, Finn; Thorstad, Eva Bonsak; Teien, Hans-Christian; Rosseland, Bjørn Olav; Salbu, Brit; Nilsen, Tom Ole; Stefansson, Sigurd Olav; Guttrup, Jim. 2011. Påvirkes laksesmolt av aluminium i brakkvann? Telemetriundersøkelser i Storelva i Holt, Aust-Agder, 2007. NIVA-rapport. 6245. Norsk institutt for vannforskning, Oslo. 81 pages.
  • Hjeltnes, Brit; Waagbø, Rune; Finstad, Bengt; Rosseland, Bjørn Olav; Rosten, Trond Waldemar; Stefansson, Sigurd; Braastad, Bjarne Olai; Bøe, Knut Egil; Flåøyen, Arne; Hoel, Kristian; Håstein, Tore; Rimstad, Espen; Østerås, Olav; Farstad, Wenche Kristin. 2008. Transportation of fish within a closed system. Opinion of the Panel on Animal Health and Welfare of the Norwegian Scientific Committee for Food Safety. VKM report. 2008:23. Norwegian Scientific Committee for Food Safety (VKM), Oslo, Norway. 63 pages.
  • Kroglund, Frode; Gutterup, Jim; Kleiven, Einar; Stefansson, Sigurd; Barlaup, Bjørn; Teien, Hans-Christian. 2007. Aluminium, et miljøproblem for laks i Sandnesfjorden, Aust-Agder. 5366-2007. Norsk institutt for Vannforskning. 47 pages.
  • Farstad, Wenche Kristin; Arnemo, Jon Martin; Braastad, Bjarne Olai; Bæverfjord, Grete; Fossum, Kåre; Handeland, Sigurd O; Hansen, Tom Johnny; Hjeltnes, Brit; Håstein, Tore; Juell, Jon-Erik; Nygård, Solveig; Rosseland, Bjørn Olav; Rosten, Trond Waldemar; Stefansson, Sigurd Olav; Toften, Hilde; Valle, Paul Steinar; Waagbø, Rune; Bøe, Knut Egil. 2006. Dyrevelferdsmessig risikovurdering av produksjon av 0-årssmolt. Uttalelse fra Faggruppe for Dyrehelse og Dyrevelferd (Dyrevern) i Vitenskapskomiteen for mattrygghet. VKM report. 2006:22. Norwegian Scientific Committee for Food Safety (VKM), Oslo, Norway. 12 pages.
  • Stefansson, Sigurd; Bæverfjord, Grete; Handeland, Sigurd O.; Hansen, Tom; Nygård, Solveig; Rosseland, Bjørn Olav; Rosten, Trond; Bjørgolfur, Havardsson; Toften, Hilde. 2006. Fiskevelferdsmessig vurdering av produksjon av 0-års smolt. 05/807. Mattilsynet, Vitenskapskomiteen. Faggruppen for dyrehelse og dyrevelferd (dyrevern) (FG8), Oslo. 86 pages.
  • Handeland, Sigurd O.; Wilkinsson, E; Stefansson, Sigurd. 2001. Smolting and de-smolting at different temperatures in two strains of Atlantic salmon (Salmo salar L.). IFM rapport. 10. Institutt for Fiskeri- og Marinbiologi, UiB, Bergen. 20 pages.
  • Handeland, Sigurd O; Wilkinsson, E.; Stefansson, Sigurd. 2001. Smolting and de-smolting at different temperatures in two strains of Atlantic salmon (Salmo salar L.). IFM rapport. 10. Institutt for fiskeri- og marinbiologi, Univ. i Bergen, Bergen. 20 pages.
  • Folkvord, Arild; Blom, Geir; Helvik, Jon Vidar; Holmqvist, Bo I.; Johannessen, Arne; Otterlei, Erling; Stefansson, Sigurd; Brattegard, Torleiv. 1998. Teori- og eksperimentbasert studie av rekruttering hos marin fisk. Sluttrapport for del I av Strategisk Program. IFM rapport. 7. Inst. for fiskeri- og marinbiologi, Univ. i Bergen. 46 pages.
  • Lyse, Alv Arne; Stefansson, Sigurd; Fernö, Anders; Brattegard, Torleiv. 1997. Undersøkelser av habitat og produksjon av sjøauresmolt (Salmo trutta L.) fra sidebekker og sideelver til Lærdalselva. IFM rapport. 13. Institutt for fiskeri- og marinbiologi, UiB. 28 pages.
  • Lyse, Alv Arne; Stefansson, Sigurd; Fernö, Anders; Brattegard, Torleiv. 1997. Undersøkelser av habitat og produksjon av sjøauresmolt (Salmo trutta L.) fra bekker og elver i Kvam herad, Hordaland. IFM rapport. 24. Institutt for fiskeri- og marinbiologi, UiB. 48 pages.
  • Lyse, Alv Arne; Stefansson, Sigurd; Fernø, Anders. 1996. Undersøkelser av vandringsadferd, diett og predasjon i tidlig postsmoltfase hos sjøaure (Salmo trutta L.) fra Aurlandselva, Indre Sogn. IFM rapport. 12. Institutt for fiskeri- og marinbiologi. 34 pages.
  • Handeland, Sigurd O; Järvi, T.; Fernø, Anders; Stefansson, Sigurd; Ridell, B. 1991. Consequences of seawater acclimation on the survival of Atlantic salmon (Salmo Salar L.) smolts in the presence of cod (Gadus morhua L.). [Mangler utgivernavn].
  • Stefansson, Sigurd. 1990. The influence of light on growth and parr-smolt transformation of Atlantic salmon (Salmo salar L.) : effects of spectral compositon, light intensity and photoperiod. Institutt for fiskeri- og marinbiologi, Bergen. 1 pages.
Book sections
  • Stefansson, Sigurd Olav; Bjørnsson, B. Th.; Ebbesson, Lars O.E.; McCormick, S.D. 2008. Smoltification. Kapittel, pages 607-681. In:
    • Finn, Roderick Nigel; Kapoor, B.G. 2008. Fish Larval Physiology. Science Publishers Inc.. 742 pages. ISBN: 978-1-57808-388-6.
  • Stefansson, Sigurd; Bjerknes, Vilhelm; Bjørn, Pål Arne; Bæverfjord, Grete; Finn, R.Nigel; Finstad, Bengt; Fivelstad, Sveinung; Handeland, Sigurd O.; Hosfeld, Anne Camilla Diesen; Kristensen, Torstein; Kroglund, Frode; Nilsen, Tom Ole; Rosseland, Bjørn Olav; Rosten, Trond; Salbu, Brit; Teien, Hans-Christian; Toften, Hilde; Åtland, Åse. 2007. Fysiologiske egenskaper ved rogn, yngel og smolt. faglig_bok_forlag, pages 94-124. In:
    • 2007. Vannkvalitet og smoltproduksjon. Red.Vilhelm Bjerknes. 31 pages.
  • Stefansson, Sigurd; Bjerknes, Vilhelm; Bjørn, Pål Arne; Bæverfjord, Grete; Finn, Roderick Nigel; Finstad, Bengt; Fivelstad, Sveinung; Handeland, Sigurd O.; Hosfeld, Camilla Diesen; Kristensen, Torstein; Kroglund, Frode; Nilsen, Tom Ole; Rosseland, Bjørn Olav; Rosten, Trond; Salbu, Brit; Teien, Hans-Christian; Toften, Hilde; Åtland, Åse. 2007. Fysiologiske egenskaper ved rogn, yngel og smolt. Kapittel 3, pages 94-123. In:
    • Bjerknes, Vilhelm. 2007. Vannkvalitet2 og smoltproduksjon. 228 pages. ISBN: 978-82-8090-018-0.
  • Stefansson, Sigurd; Bæverfjord, Grete; Nigel Finn, R; Finstad, Bengt; Fivelstad, Sveinung; Handeland, Sigurd O.; Kristensen, Torstein; Thomassen, Magny Skinlo; Kroglund, Frode; Rosseland, Bjørn Olav; Rosten, Trond; Salbu, Brit; Toften, Hilde; Gudding, Roar; Norberg, Birgitta; Jørgensen, Leif. 2007. Water Quality - Salmonids. faglig_bok_forlag, pages 101-119. In:
    • 2007. Aquaculture research: From Cage to Consumption. 19 pages.
  • Kroglund, Frode; Finstad, Bengt; Stefansson, Sigurd; Kristensen, Torstein; Rosseland, Bjørn Olav; Teien, Hans-Christian; Salbu, Brit; Hansen, Lars Petter; Windsor, M. 2006. Interactions between acidification in fresh water and sea lice sensitivity as an underlaying factor causing delayed responses. 42. In:
    • 2006. NINA Temahefte. 34. Norsk institutt for naturforskning, NINA, NINA, Trondheim ; NASCO, UK, Edinburgh; ICES, Copenhagen. 42 pages.
  • Stefansson, Sigurd; Bæverfjord, Grete; Finn, Roderick Nigel; Finstad, Bengt; Fivelstad, Sveinung; Handeland, Sigurd O; Kristensen, Torstein; Kroglund, Frode; Rosseland, Bjørn Olav; Rosten, Trond; Salbu, Brit; Toften, Hilde. 2006. Vannkvalitet - laksefisk. kapittel 5, pages 95-112. In:
    • Thomassen, Magny; Gudding, Roar; Norberg, Birgitta; Jørgensen, Leif. 2006. Havbruksforskning: Fra merd til mat. Norges forskningsråd. 373 pages. ISBN: 82-12-02277-3.
  • Toften, Hilde; Johansen, Lill-Heidi; Sommer, Ann-Inger; Damsgård, Børge; Arnesen, Arne Mikal; Stefansson, Sigurd; Handeland, Sigurd O.; Kristensen, Torstein; Rosseland, Bjørn Olav; Salbu, Brit; Fivelstad, Sveinung; Lemarie, G. 2005. Intensive rearing and welfare in juvenile Atlantic salmon. -. In:
    • 2005. EAS Special Publication. 35. European Aquaculture Society, Ostende, Belgium.
  • Stefansson, Sigurd; Blaalid, Gustav Erik; Møller, Dag. 1996. Oppdrett av laks i Norge - en kort oversikt. 11-18. In:
    • Wergeland, H.I.; Aalvik, B.; Rødseth, O.M. 1996. Frisk Fisk om liv og død i merdene. Universitetsforlaget. ISBN: 82-00-22651-4.
  • Stefansson, Sigurd; Hansen, Tom. 1996. Smoltifisering hos laks - en tilpasning til livet i sjøvann. 46-54. In:
    • Wergeland, H.I.; Aalvik, B.; Rødseth, O.M. 1996. Frisk Fisk om liv og død i merdene. Universitetsforlaget. ISBN: 82-00-22651-4.
  • Tananger, G. L.; Haux, C.; Walther, Bernt T.; Stefansson, Sigurd; Björnsson, B. Th.; Hansen, T. 1991. Photoperiodic control of growth, incidence of sexual maturation and ovulation in adult Atlantic salmon (#_S#_a#_l#_m#_o#_ #_s#_a#_l#_a#_r ). 145-148. In:
    • Scott, A. P.; Sumpter, J. P.; Kime, D. E.; Rolfe, M. S. 1991. Reproductive Physiology of Fish, 4th. Intntl. Symp., Norwich UK,.

More information in national current research information system (CRIStin)

Selected publications (2013-2017)

2017

Imsland, A.K.D., Roth, B., Fjelldal, P.G., Stefansson, S.O., Handeland, S. and Mikalsen, B., 2017. The effect of continuous light at low temperatures on growth in Atlantic salmon reared in commercial size sea pens. Aquaculture, 479, 645-651. DOI: 10.1016/j.aquaculture.2017.07.014

Moore L. J., Nilsen T. O., Jarungsriapisit J., Fjelldal P. G., Stefansson S. O., Taranger G. L. and Patel, S., 2017. Triploid Atlantic salmon (Salmo salar L.) post-smolts accumulate prevalence more slowly than diploid salmon following bath challenge with salmonid alphavirus subtype 3. PLoS ONE 12(4): e0175468. https://doi.org/10.1371/journal.pone.0175468

Moore, L. J., Jarungsriapisit, J., Nilsen, T. O., Stefansson, S., Taranger, G. L., Secombes, C. J., Morton, H. C. and Patel, S., 2017. Immune gene profiles in Atlantic salmon (Salmo salar L.) post-smolts infected with SAV3 by bath-challenge show a delayed response and lower levels of gene transcription compared to injected fish. Fish and Shellfish Immunology, 62, 320-331.

Calabrese, S., T.O.  Nilsen, J. Kolarevic, L.O.E. Ebbesson, C. Pedrosa, S. Fivelstad, C. Hosfeld, S.O. Stefansson, B.F. Terjesen, H. Takle, C.I.M. Martins, H. Sveier, F. Mathisen, A.K. Imsland and S.O. Handeland, 2017. Stocking density limits for post-smolt Atlantic salmon (Salmo salar L.) with emphasis on production performance and welfare. Aquaculture, 468, 363-370. DOI: 10.1016/j.aquaculture.2016.10.041

2016

Imsland, A. K., K. Pettersen and S. O. Stefansson, 2016. Growth and  smoltification of three Norwegian strains of Atlantic salmon reared under different thermal regimes. River Res. Applic., 32, 1800–1807. DOI: 10.1002/rra.3011

Døskeland, I., Imsland, A. K., Fjelldal, P. G., Stefansson, S. O., Roth, B., Eriksen, K. E., Mikalsen, B. and Handeland, S. O., 2016. The effect of low temperatures and photoperiods on growth and vertebra morphometry in Atlantic salmon. Aquacult. Int., 24,1421–1434. DOI 10.1007/s10499-016-9999-7

Jarungsriapisit, J., L. J. Moore, G. L. Taranger, T. O. Nilsen, H. C. Morton, I. U. Fiksdal, S. Stefansson, P. G. Fjelldal, Ø. Evensen and S. Patel, 2016. Atlantic salmon (Salmo salar L.) post-smolts challenged two or nine weeks after seawater-transfer show differences in their susceptibility to salmonid alphavirus subtype 3 (SAV3) Virology Journal, 13 Article Number 66 DOI: 10.1186/s12985-016-0520-8

Vikingstad, E., Andersson, E., Hansen, T. J., Norberg, B., Mayer, I., Stefansson, S. O., Fjelldal, P. G. and Taranger, G. L., 2016. Effects of temperature on the final stages of sexual maturation in Atlantic salmon (Salmo salar L.). Fish Physiol. Biochem. 42,.895-907. DOI: 10.1007/s10695-015-0183-1

Angotzi, A.R, S. O. Stefansson, T. O. Nilsen, J. I. Øvrebø, E. Andersson, G. L. Taranger and I. Rønnestad, 2016. Identification of a novel leptin receptor duplicate in Atlantic salmon: Expression analyses in different life stages and in response to feeding status. Gen. Comp. Endocrinol., 235, 108-119, http://dx.doi.org/10.1016/j.ygcen.2016.06.004

Sveen, L. R., Timmerhaus, G., Torgersen, J. S., Ytteborg, E., Jørgensen, S. M., Handeland, S., Stefansson, S. O., Nilsen, T. O., Calabrese, S., Ebbesson, L., Terjesen, B. F. and Takle, H., 2016, Impact of fish density and specific water flow on skin properties in Atlantic salmon (Salmo salar L.) post-smolts, Aquaculture, 00, 000-000, doi: 10.1016/j.aquaculture.2016.08.012

2015

Salmerón, C., Johansson, M., Asaada,M., Angotzi, A.R., Rønnestad, I., Stefansson, S. O., Jönsson, E., Björnsson, B. Th., Gutiérrez, J., Navarro, I. and Capilla, E., 2015. Roles of leptin and ghrelin in adipogenesis and lipid metabolism of rainbow trout adipocytes in vitro. Comp. Biochem. Physiol., A 188, 40-48. doi:org/10.1016/j.cbpa.2015.06.017

2014

Sundh, H., Nilsen, T.O., Lindström, J., Hasselberg-Frank, L., Stefansson, S.O., McCormick, S.D., Sundell, K. (2014). Development of intestinal transport mechanisms during smoltification in Atlantic salmon smoltification and acclimation to seawater. J. Fish Biol. 85, 1227-1252. doi:10.1111/jfb.12531

Handeland, S.O., Imsland, A.K., Nilsen, T.O., Ebbesson, L.O.E., Hosfeld, C.D., Pedrosa, C., Stefansson, S.O., (2014). Osmoregulation in wild Atlantic salmon smolts transferred to seawater at different temperatures. J. Fish Biol., 85, 1163-1176. doi:10.1111/jfb.12481

Einarsdóttir, I.E., Gong, N., Jönsson-Bergman, E., Sundh, H., Hasselberg Frank, L., Nilsen, T.O., Stefansson, S.O., Sundell, K., Björnsson, B.Th., (2014). Plasma growth hormone binding protein levels in Atlantic salmon (Salmo salar L.) during smoltification and seawater transfer. J. Fish Biol. 85, 1279-1296. doi: 10.1111/jfb.12473

Imsland, AK, Handeland, SO and Stefansson, SO, 2014. Photoperiod and temperature effects on growth and maturation of pre- and post-smolt Atlantic salmon. Aquaculture International, 22, 1331-1345. doi: 10.1007/s10499-014-9750-1

Handeland, SO, Imsland, AK, Ebbesson, LOE, Nilsen, TO, Hosfeld, CD, Teien, HC and Stefansson, SO, 2014. Osmoregulation and growth in offspring of wild Atlantic salmon at different temperatures. Env. Biol. Fishes, 97, 285-296. doi: 10.1007/s10641-013-0151-5

2013

Nilsen, TO, LOE Ebbesson, SO Handeland, F Kroglund, B Finstad, AR Angotzi, SO Stefansson, 2013. Atlantic salmon (Salmo salar L.) smolts require more than two weeks to recover from acidic water and aluminum exposure. Aquatic Toxicol., 142, 33-44. doi.org/10.1016/j.aquatox.2013.07.016

Imsland, A. K., Handeland, S. O., Björnsson, B. Th. and Stefansson, S. O., 2013. Long-term effects of photoperiod and temperature and their interaction on growth, gill Na+,K+-ATPase activity, seawater tolerance and plasma growth hormone levels in Atlantic salmon. J. Fish Biol., 83, 1197-1209

Grassie, C., V.A. Braithwaite, J. Nilsson, T.O. Nilsen, H-C. Teien, S.O. Handeland, S.O. Stefansson, V. Tronci, M. Gorissen, G. Flik & L.O.E. Ebbesson, 2013. Aluminum exposure impacts brain plasticity and behavior in Atlantic salmon (Salmo salar). J. Exp. Biol., 216, 3148-3155, doi:10.1242/jeb.083550

Angotzi, A. R., Stefansson, S., Nilsen, T. O., Rathore, R. M. and Rønnestad, I. 2013. Molecular cloning and genomic characterization of novel Leptin-like genes in salmonids provide new insight into the evolution of the Leptin gene family. Gen. Comp. Endocrinol., 187, 48-59, doi: 10.1016/j.ygcen.2013.03.022  

Handeland, S. O., Imsland, A. K., Ebbesson, L. O. E., Nilsen, T. O., Hosfeld, C. D., Teien, H. C. and Stefansson, S. O., 2013. Osmoregulation and growth in offspring of wild Atlantic salmon at different temperatures. Environmental Biology of Fishes, 97, 285-296.

Handeland, S. O., Imsland, A. K., Ebbesson, L. O. E., Nilsen, T. O., Hosfeld, C. D., Baeverfjord, G., Espmark, Å., Rosten, T., Skilbrei, O. T., Hansen, T., Gunnarsson, G. S., Breck, O. and Stefansson, S. O., 2013. Low light intensity can reduce Atlantic salmon smolt quality. Aquaculture, 384-387, 19-24. doi: org/10.1016/j.aquaculture.2012.12.016

Handeland, S. O., Imsland, A. K, Björnsson, B. Th., Stefansson, S. O. and Porter, M. 2013. Physiology during smoltification in Atlantic salmon: effect of melatonin implants. Fish Physiol. Biochem., 39, 1079-1088. doi: 10.1007/s10695-012-9765-3

Urke, H.A., Kristensen, T., Arnekleiv, J.V., Haugen, T.O., Kjærstad, G., Stefansson, S.O., Ebbesson, L.O.E. and Nilsen, T.O., 2013. Seawater tolerance and post-smolt migration of wild Atlantic salmon Salmo salar × brown trout S. trutta hybrid smolts, J. Fish Biol., 82, 206–227, doi:10.1111/j.1095-8649.2012.03481.x

Cand. scient., Dept. of Fisheries Biology, University of Bergen (UiB), 25.06.1986

Thesis: Lysperiodens virkning på vekst og smoltifiser­ing hos laks (Salmo salar L.)

Dr. scient., Dept. of Fisheries and Marine Biology, UiB, 10.12.1990

Thesis: The influence of light on growth and parr-smolt trans­formation of Atlantic salmon (Salmo salar L.): Effects of spectral composition, light intensity and photoperiod

National projects (Research Council of Norway)

NFFR V.701.146 'Miljøforholdene i settefisk­produksjon', 1986 - 1988

NTNF HB 23.22395 'Lys i fiskeoppdrett', 1987 - 1989

NFFR V.701.211 'Halvtårssmolt', 1988 - 1990

NFFR V.701.236 'Lys i matfiskprodu­ksjon', 1989 - 1991

NFFR 1401-701.321 'Smoltkvalitet og helse', 1991 - 1993

NFR 108848 ‘Smoltkvalitet, sesonguavhengig utsetting og tidlig sjøvannsfase’, 1995 - 1998

NFR 108098 ‘Postsmoltøkologi – trofisk nivå og vandringer’, 1995 - 1997

NFR 110993 ‘Miljømessig og arvelig regulering av vekst hos ung kveite i oppdrett’, 1996 - 1999

NFR 122845 ‘Det arvelige grunnlaget for smoltifisering hos oppdrettslaks og villaks – en grunnleggende studie’, 1998 - 2000

NFR 133964 ’Vannbehov og vannkvalitet under intensiv smoltproduksjon. Hva er grenseverdiene og hvordan unngå skadelige effekter av lav vanngjennomstrømming, lav pH og høg CO2 under intensiv smoltproduksjon?’, 2000 – 2002

NFR 133937 ‘Control of age at first sexual maturity (puberty) in farmed Atlantic salmon’, 2000 – 2002

NFR 149790 'Distribution and ecology of post-smolt and salmon at sea', 2002 - 2005

NFR 149796 ‘The importance of early marine feeding on the growth and survival of Atlantic salmon post-smolt in Norwegian fjords’, 2002 - 2006

NFR 153230 ‘Environmental control of smolt brain development’, 2003 – 2005

NFR 165331 ‘Environmental impact and molecular regulation of the osmoregulatory gill during parr-smolt transformation in Atlantic salmon’, 2005 – 2007

NFR 163429 ‘Optimisation of harvested halibut by lowering maturation, increasing growth and improving flesh quality’ 2005 – 2007

NFR 165239 ‘Sjøvannsinnblanding i intensiv smoltproduksjon: effekter på helse, velferd og risiko for vintersår’, 2005 – 2007

NFR 172504 ’Nitric oxide regulation of development in fish: emphasis on the light-brain-pituitary axis and gill during salmon smoltification’, 2006 - 2008

NFR 1722630 ‘Progressive, modern production of juvenile Atlantic cod’ (PROCOD), 2006 - 2009

NFR 172514 ‘Moderne settefiskproduksjon av laks - normal utvikling og velferd i intensive oppdrettsystemer’, 2006 - 2009

NFR 184997 ‘Optimal smolt production and post smolt performance in the High North - Seawater intermixing, low temperatures and intensive rearing’ (NORSMOLT), 2008 – 2011

NFR 190469 ‘Fish welfare assessment through brain function: Impacts of environmental stress on brain plasticity and behaviour’, 2009 – 2011

NFR 199800 ‘The smolt probe - novel tools for assessment of smolt quality and marine performance in Atlantic salmon’, 2010 – 2012

NFR 199518 ‘Early puberty in salmon males in seawater - causes and consequences for hypoosmoregulatory ability and welfare’, 2010 – 2013

NFR 199482 ‘Cod Development CODE’, 2010 – 2013

NFR 222215 ’The smolt brain model: Unraveling nature´s regulation of neural plasticity’, 2013 – 2015

NFR 233870 ‘Welfare of Atlantic salmon postsmolts in closed-containment production systems, using a function-based approach’ (SalmoFutura), 2014-2016

NFR 256199 ‘Optimal bruk av rognkjeks til avlusing av oppdrettslaks, LUSINFE’R, 2016 – 2020

NFR 269043 ‘Kontroll av kjønnsmodning hos rognkjeks, STAMINA’, 2017 – 2021

National strategic programs (Research Council of Norway)

114646 ‘Teori- og eksperimentbasert studie av rekruttering hos marin fisk’, 1995 - 1998

136260 ‘Smolting in Atlantic salmon: the interrelationship between physiological, endocrine and immunological changes, and their genetic regulation’, 2000 - 2006

Other national programs (Fiskeri og havbruksnæringens forskningsfond, FHF)

FHF/NFR 155157 'Vannkvalitet – smoltkvalitet', 2003 – 2005

International projects

Nordisk Industri­fond 88.107 'Helårlig produksjon av atlantisk laks ved styrt kjønns­mo­dning og smoltifiser­ing', 1988 - 1991

EU, FAIR-CT96-1410 ‘Environmental and neuroendocrine control mechanisms in finfish reproduction and their application in broodstock management’, 1997 - 1999

EU, FAIR-CT97-3544 ‘A multidisciplinary evaluation and optimization of the production characteristics of different strains of commercially cultured flatfish’, 1998 - 2000

Wallenberg foundation, 1997 - 2001

‘Aquaculture and Fisheries Development: Basic Research on Finfish Reproduction and Growth Enabling the Intensification of Aquaculture’

‘The Multiple Gonadotropin-Releasing Hormones (GnRH) of Fish: Functions and Potential Use for Spawning Manipulations in Commercially and Ecologically Important Fish Species’

EU, QoL, QLRT-2001-01801 ‘Photoperiod control of puberty in farmed fish: Development of new techniques and research into underlying physiological mechanisms’, 2002 - 2005

EU, LSF ‘Marine Pelagic Food Chain Research’, (Contract No ERBFMGECT950013)

Research collaborators/topics:

Professor Niall Bromage, University of Stirling, Skottland

Temperature effects on melatonin in post-smolt Atlantic salmon (Salmo salar), 1997

Professor Sjoerd E. Wendelaar Bonga, Katholieke Universiteit Nijmegen, Nederland

The effect of temperature on growth performance and stress resistance in two generations of turbot (Scophthalmus maximus Rafinesque), 1997

Influence of temperature and feeding ration on the bioenergetics of juvenile turbot (Scophthalmus maximus) and Atlantic halibut (Hippoglossus hippoglossus), 1998

Dr. Richard FitzGerald, University College Cork, Irland

The effect of different initial size distribution on the growth of Atlantic halibut (Hippoglossus hippoglossus L.), 1998

Dr. Ewa Kulczykowska, Marine Biology Center of Polish Academy of Sciences, Gdynia, Polen

Melatonin – Arginine vasotocin relationship during development of Salmo salar, 2001

EU, Improving Human Potential, Access to Research Infrastructure, Institute of Aquaculture, University of Stirling, Scotland, Contract HPRI-CT-1999-00106

Professor Niall Bromage

Endocrine regulation of growth and food intake in salmon smolts, 2000/2001

EU, FP7-KBBE-2007-2A, 222719, LIFECYCLE—Building a biological knowledge-base on fish lifecycles for competitive, sustainable European aquaculture (01.03.2009 – 28.02.2013)

Centre

Centre for research based innovation (SFI): Centre for Research-based Innovations in Controlled-environment Aquaculture (CtrlAQUA), 2015 – 2023. http://ctrlaqua.no/