Tom Ole Nilsen


Associate Professor


Research groups

Academic article
Academic literature review
Popular scientific lecture
Academic lecture
Academic chapter/article/Conference paper
Popular scientific article
Article in business/trade/industry journal
Thesis at a second degree level

See a complete overview of publications in Cristin.

Publications in Per-Review Journals

Urke, H.A., Arnekleiv, J.V., Nilsen, T.O., Nilssen, K.J. (2014). Development of seawater tolerance and subsequent downstream migration in wild and stocked young-of-the-year derived Atlantic salmon Salmo salar. Journal of Fish Biology 84, 178 - 192.

Handeland, S.O., Ebbesson, L.O.E., Nilsen, T.O., Hosfeld, C.D., Teien, H.C., Stefansson, S.O. (2014). Osmoregulation and growth in wild Atlantic salmon smolts at different temperatures. Environmental Biology of Fishes EBFI-D-12-02989 (in press).

Nilsen, T.O., Ebbesson, L.O.E., Handeland, S.O., Kroglund, K., Finstad, B., Angotzi, A.R., Stefansson, S.O. (2013) Atlantic salmon (Salmo salar L.) smolts require more than two weeks to recover from acidic water and aluminium exposure. Aquatic Toxicology 142-143, 33-34.

Salvanes, A.G.V., Moberg, O., Ebbesson, L.O.E., Nilsen, T.O., Jensen, K.H., Skorping, A., Braithwaite, V.A. (2013). Environmental enrichment promotes neural plasticity and cognitive ability in fish. Proceedings of the Royal Society B 280: 20131331.

Grassie, C., Braithwaite, V.A., Nilsson, J., Nilsen, T.O., Teien, H.C., Handeland, S.O., Stefansson, S.O., Tronci, V., Ebbesson, L.O.E. (2012). Aluminum exposure impacts brain plasticity and behavior in Atlantic salmon (Salmo salar). Journal of Experimental Biology 216, 3148-3155.

Angotzi, A.R., Stefansson, S.O., Nilsen, T.O., Rathore, R.M., 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. General and comparative endocrinology 187, 48-59.

Urke, H.A., Kristensen, T., Arnekleiv, J.V., Haugen, T.O., Kjærstad, G., Stefansson, S.O., Ebbesson, L.O.E., Nilsen, T.O., (2013). Sea water tolerance and post smolt migration of wild Atlantic salmon Salmo salar x brown trout S. trutta hybrid smolts. Journal of Fish Biology 82, 206-227.

Handeland, S.O., Imsland, A., Ebbesson, L.O.E., Nilsen, T.O., Hosfeld, C.D., Baeverfjord, G., Espmark, Å., Rosten, T., Skilbrei, O., Hansen, T., Gunnarsson, G.S., Breck, O., Stefansson, S.O., (2013). Low light intensity can reduce Atlantic salmon smolt quality. Aquaculture 384-387, 19-24.

Urke, H.A., Kristensen, T., Arnekleiv, J.V., Haugen, T.O., Kjærstad, G., Stefansson, S.O., Ebbesson, L.O.E., Nilsen, T.O. (2013). Sea water tolerance and post smolt migration of wild Atlantic salmon x brown trout hybrid smolts. Journal of Fish Biology 82, 206-227.

Stefansson, S.O., Haugland, M., Björnsson, B.Th., McCormick, S.D., Holm, M., Ebbesson, L.O.E., Holst, J.C., Nilsen, T.O., (2012). Growth, osmoregulation and endocrine changes in wild Atlantic salmon post-smolts during marine migration. Aquaculture 362-363, 127-136.

Kroglund, K., Finstad, B., Pettersen, K., Teien, H.C., Salbu, B., Rosseland, Rosseland, B.O., Nilsen, T.O., Stefansson, S.O., Ebbesson, L.O.E., Nilsen, R., Bjørn, P.A., Kristensen, T., (2012). Recovery rates in Atlantic salmon smolt following aluminum exposure defined by changes in blood physiology and seawater tolerance. Aquaculture 362-363, 232-240.

Finstad, B., Kroglund, K., Bjørn, P.A., Pettersen, K., Rosseland, B.O., Teien, H.C., Nilsen, T.O., Stefansson, S.O., Salbu, B., Nilsen, R., Fiske, P., Ebbesson, L.O.E., (2012). Salmon lice induced mortality of Atlantic salmon postsmolts experiencing episodic acidification and recovery in freshwater. Aquaculture 362-363, 193-199.

Kling, P., Bergman, E.J., Nilsen, T.O., Einarsdottir, I.E., Rønnestad, I., Stefansson, S.O., Björnsson, B.Th. (2012). The role of growth hormone in growth, lipid homeostasis, energy utilization and partitioning in rainbow trout: interactions with insulin-like growth factor I, ghrelin and leptin. General and comparative endocrinology 175, 153-162.

Ebbesson, L.O.E., Nilsen, T.O., Helvik, J.V., Tronci, V., Stefansson, S.O. (2011). Corticotropin-releasing factor neurogenesis during midlife development in salmon: genetic, environment and thyroid hormone regulation. Journal of Neuroendocrinology 23, 733-741.

Murashita, K., Jordal, A. E. O., Nilsen, T.O., Stefansson, S.O., Kurokawa, T., Björnsson, B.Th., Gamst-Moen, A.G., Rønnestad, I., (2010). Leptin reduces Atlantic salmon growth through the central pro-opiomelanocortin pathway. Comparative Biochemistry and physiology Part A 158, 79-86.

Nilsen, T.O., Ebbesson, L.O.E., Kverneland, O.G., Kroglund, F. Finstad, B., Stefansson, S.O., (2010). Effects of acidic water and aluminum exposure on gill Na+, K+ ATPase – α subunit isoforms, enzyme activity, physiology and return rates in Atlantic salmon (Salmo salar L.). Aquatic Toxicology 97, 250-259.

Rønnestad, I., Nilsen, T.O., Murashita, K., Angotzi, A.R., Gamst Moen, A.G., Stefansson, S.O., Björnsson, B.Th., Kling, P., Kurokawa, T., (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.

Murashita, K., Kurokawa, T., Nilsen, T.O., Rønnestad, I., (2009). Ghrelin, cholecystokinin and peptide YY in Atlantic salmon (Salmo salar): molecular cloning and tissue expression. General and comparative endocrinology 160, 223-235.

Nilsen, T.O., Ebbesson, L.O.E., Kiilerich, P., Björnsson, B.Th., Madsen, S.S., McCormick, S.D., Stefansson, S.O., (2008). Endocrine systems in juvenile anadromous and landlocked Atlantic salmon (Salmo salar): Seasonal development and seawater acclimation. General and comparative endocrinology 155, 762-772.

Tipsmark, C.K., Kiilerich, P., Nilsen, T.O., Ebbesson, L.O.E., Stefansson, S.O., Madsen, S.S. (2008). Branchial Expression Patterns of Claudin Isoforms in Atlantic Salmon During Seawater Acclimation and Smoltification. Am J Physiol Regul Integr Comp Physiol. 294, R1563-R1574.

Nilsen, T.O., Ebbesson, L.O.E., Madsen, S.S., McCormick, S.D., Andersson, E., Björnsson, B.Th., Prunet, P., Stefansson, S.O., (2007). Differential expression of gill Na+, K+-ATPase α & β subunits, Na+, K+, 2Cl- cotransporter and CFTR anion channel in juvenile anadromous and landlocked Atlantic salmon (Salmo salar). The Journal of Experimental Biology 210, 2885-2896.

Stefansson, S.O, Nilsen, T.O., Ebbesson, L.O.E., Wargelius, A., Madsen, S.S., Björnsson, B.Th., McCormick, S.D., (2007). Molecular mechanisms of continuous-light inhibition of Atlantic salmon parr-smolt transformation. Aquaculture 273, 235-245.

Ebbesson, L.O.E., Ebbesson, S.O.E., Nilsen, T.O., Stefansson, S.O., Holmqvist, B., (2007). Exposure to continuous light disrupts retinal innervation of the preoptic nucleus during parr-smolt transformation in salmon. Aquaculture 273, 345-349.

Kroglund, F., Finstad, B., Stefansson, S.O., Nilsen, T.O., Kristensen, T. Rosseland, B.O., Teien, H.C., Salbu, B., (2007). Exposure to moderate acid water and aluminum reduces Atlantic salmon postsmolt survival. Aquaculture 273, 360-373.

Finstad, B., Kroglund, F., Strand, R., Stefansson, S.O., Bjørn, P.A., Rosseland, B.O., Nilsen, T.O., Salbu, B., (2007). Salmon lice or suboptimal water quality – reasons for reduced postsmolt survival? Aquaculture 273, 374-383.

Rønnestad, I., Gavaia, P.J., Viegas, C.S.B., Verri, T., Romano, A., Nilsen, T.O., Jordal, A.J., Kamisaka, Y., Cancela, M.L., (2007). Oligopeptide transporter PepT1 in Atlantic cod (Gadus morhua L.): cloning, tissue expression and comparative aspects. The Journal of Experimental Biology 210, 3883-3896.

Ebbesson, L.O.E., Tipsmark, C.K., Holmqvist, B., Nilsen, T.O., Andersson, E., Stefansson, S.O., Madsen, S.S., (2005). Nitric oxide producing cells in the gill of Atlantic salmon and their inhibition of Na+,K+-ATPase activity. The Journal of Experimental Biology 208, 1011-1017.

Olsvik, P. A., Lie, K. K., Jordal, A. E. O., Nilsen, T.O., Hordvik, I., (2005). Evaluation of potential reference genes in real-time RT-PCR studies of Atlantic salmon. Bmc Molecular Biology 6:21, 1-9.

Nilsen, T.O., Ebbesson, L.O.E., Stefansson, S. O., 2003. Smolting in anadromous and landlocked strains of Atlantic salmon (Salmo salar). Aquaculture 222, 71-82.

Book Chapter

Stefansson, S.O., Bjerknes, V., Bjørn, P.A., Bæverfjord, G., Finn, R.N., Finstad, B., Fivelstad, S., Handeland, S.O., Hosfeld, C.D., Kristensen, T., Kroglund, K., Nilsen, T.O., Rosseland, B.O., Rosten, T., Salbu, B., Teien, H.C., Toften, H., Åtland, Å. (2007). Fysiologiske egenskaper ved rogn, yngel og smolt. In: Bjerknes, V. (ed), Vannkvalitet og smoltproduksjon: Juul forlag 2007. ISBN 978-82-8090-018-0. s. 94-123. (In Norwegian).

Publications in popular Science Journals

Nilsen, T.O., Ebbesson, L.O.E., Kverneland, O.G., Kroglund, F., Finstad, B., Stefansson, S.O. (2010). Ny metode kan påvise skader hos laksesmolt som er utsatt for aluminiumsrikt surt vann. pH-status nr. 4, 12-13 (in norwegian)

Kroglund F., Finstad, B., Pettersen, K., Rosseland, B.O., Bjørn, P.A., Teien, T.C., Salbu, B., Nilsen, T.O., Stefansson, T.O., Ebbesson, L.O., Nilsen, R., Kristiansen, T., (2010) Forsurigsskader og helbredningstid for laksesmolt. pH-status nr.1, 6-7 (in Norwegian)

Stefansson, S.O. and Nilsen, T.O. (2012). The smolt probe – novel tools for assessment of smolt quality and marine performance in Atlantic salmon. Public Service Review: European Union, 23, page 472.




2007 Ph.D. fra Universitetet i Bergen, Institutt for biologi. Avhandling “Molecular and endocrine aspects of hypo-osmoregulatory development in Atlantic salmon (Salmo salar L.),” ISBN 978-82-308-0456-8.

2002 Cand. Cient., fra Universitetet i Bergen, Institutt for fiskeri- og marinbiologi

1999 Høyskolekandidat i akvakultur fra Høyskolen i Sogndal.