Rolf Erik Olsen

Telefon: 975 98 169

Arbeider med

Rolf Erik Olsen, group animal welfare, has been at the institute since 1998. He has 25 years experience in fisheries research. The research focus throughout the years has been within fish nutrition, lipid metabolism, stress biology, and alternative feed resources. Current main focus is on intestinal integrity, intestinal lipid metabolism (absorption, reacylation), eicosanoid cascades in relation to oxidative stress and inflammatory processes, and chronic stress mechanisms.

Brief details of interests

a) Stress and welfare in fish. Focus on the effects of diet and stress on primary barriers. Main activity on dietary lipids, particularly the effect of vegetable oils. Recent activities include diets in relation to stress resistance, and chronic stress mechanisms.

b) General lipid metabolism. Particular focus on intestinal lipid metabolism, and the relationship betweeen eicosanoid cascades and inflammatory processes.

c) Prebiotics. Effects of diets and stress on colonization of intestinal microbiota.

d) New feed resources. Utilisation of feed resources from lower tropic levels.

e) Pigmentation in salmonids and copepods. Causes and mechanism of pigmentation.

Curriculum Vitae

Curriculum vitae – Rolf Erik Olsen – short list - last updated - December 2012

Nationality: Norwegian, Date of birth: 6th August 1959, Position: Principal scientist

Employment history
1985 - 1986 Reseacher Bio-Sea A/S, Tromsø
1986 - 1987 Scolarship (NRC) at NERC, University of Stirling, Scotland.
1988 - 1989 National service, Governmental Research Institute, Holt, Tromsø.
1989 - 1990 Researcher, Norwegian Fisheries College, University of Tromsø.
1990 - 1998 Associated professor, Inst. Aquaculture, Finnmark College, Alta, Norway.
1998 -  present Principal Scientist (Prof. equival.) IMR.

Research activities
a) Stress and welfare in fish. Focus on the effects of diet and stress on primary barriers. Main focus is on dietary lipids, particularly the effect of vegetable oils. Recent activities include diets in relation to chronic stress mechanisms.
b) General lipid metabolism. Particular focus on intestinal lipid metabolism, eicosanoid cascades and inflammatory processes.
c) Prebiotics. Effects of diets and stress on colonization of intestinal microbiota.
d) New feed resources. Utilisation of feed resources from lower tropic levels.
e) Pigmentation in salmonids. Causes and mechanism of pigmentataion.

Has been supervisor/co-supervisor of several master, PhD students and post doc positions.

Research grants as principal investigator.
Essential fatty acids in Arctic charr 1988 – 1989, Norwegian Research Council (NFFR).
Winter feed for salmon in cold climate, 1991 - Landsdelsutvalget (LU).
Improved pigmentation of Atlantic salmon, 2001 – 2004 NRC
Krill as feed source for farmed fish 2001 – 2005, NRC.
New marine feed resources, 2001 – 2004 IMR large project.
Marine wax esters, 2005 – 2007, NRC
New Marine Feed Resources. The building of a consortium towards exploitation of un-utilised marine resources for diets to farmed fish, 2006 – 2009 NRC Platform project.

Research grants as Co-applicant/investigator
Sexual maturation in Arctic charr – 1991, funded by LU.
Effects of submersed detonations on fish. 1991-1992 NFFR.
Feedig strategies at long term holding of saithe in cages, 1996, Applied science, NRC.
Stress related changes in the gastrointestinal tract of salmonids. 1997 NRC.
Quality in salmonids bred at various temperatures and latitudes. 1998 – NRC.
Gastrointestinal Functions and Food Intake Regulation in Salmonids: Impact of Dietary Vegetable Lipids. Norwegian Partner, 2000 – 2003 EU funded.
Improved quality of herring for humans, Norwegian partner 2005 – 2008 Nordic Industrial Fund.
SILLQUID - Can a Microwave Quick Tool Predict Quality and Origin of Herring, Norwegian partner, 2008 – 2009 Nordic Industrial Fund.
AQUAMAX, Sustainable aquafeeds to maximize the health benefits of farmed fish for consumers,  2006-2010, EU FP6 Integrated Project
AQUAEXCEL, Aquaculture infrastructures for excellence in European fish research , FP7 project, Research Infrastructure
COPEWELL, A new integrative framework for the study of fish welfare based on the concepts of allostasis, appraisal and coping styles, FP7, Integrated project.

~ 115 papers in peer-reviewed literature
~ 100 other conference proceedings, popular articles and reports.

Peer reviewed publications
1. Olsen, Rolf Erik (1985) Lipid oxidation, antioxidants and methods 124 pp (Thesis, Univ. i Tromsø, Norway)
2. Ringø,E., Olsen,R.E. and Bøe,B. (1987) Initial feeding of wolf fish (Anarchichas lupus) fry. Aquaculture, 62: 33-43.
3. Olsen,R.E. and Henderson,R.J. (1989) The rapid analysis on neutral and polar marine lipids using double development HPTLC and scanning densitometry. J.Exp.Mar.Biol.Ecol., 129: 189-197.
4. Pedersen,T., Eliassen,J.E., Eilertsen,H.C., Tande,K.S. and Olsen,R.E. (1989) Feeding, growth, lipid composition, and survival of larval cod (Gadus morhua L.) in relation to environmental conditions in an enclosure at 70° in northern Norway. Rapp.P.-v.Reun. Cons. int. Explor. Mer., 191: 409-420.
5. Olsen,R.E., Henderson,R.J. and McAndrew,B.J. (1990) The conversion of linoleic acid and linolenic acid to longer chain polyunsaturated fatty acids by Tilapia (Oreochromis) nilotica in vivo. Fish Physiol.Biochem., 8: 261-270.
6. Norrbin,M.F., Olsen,R.E. and Tande,K.S. (1990) Seasonal variation in lipid class and fatty acid composition of two small copepods in Balsfjorden, northern Norway. Mar.Biol. 105: 205-211.
7. Jøstensen,J.P., Olsen,R.E. and Ringø,E. (1990) The presence of eicosapentaenoic acid (20:5 (n-3) in lipids from fresh water bacteria isolated from intestinal liquid from Arctic charr (Salvelinus alpinus (L.). Fisk. Dir. Skr., Ser. Ernæring, Vol. III: 31-35.
8. Olsen,R.E., Henderson,R.J. and Ringø,E. (1991) Lipids of Arctic charr, Salvelinus alpinus (L.) I. Dietary induced changes in lipid class and fatty acid composition. Fish Physiol. Biochem. 9: 151-164.
9. Olsen,R.E., Henderson,R.J. and Pedersen,T. (1991) The influence of dietary lipid classes on the fatty acid composition of small cod Gadus morhua L. juveniles reared in an enclosure in northern Norway. J. Exp. Mar.Biol. Ecol. 148: 59-76.
10. Henderson,R.J., Olsen,R.E. and Eilertsen,H.C. (1991) Lipid composition of phytoplankton from the Barents Sea and environment on the distribution pattern of carbon among photosynthetic end products. Polar Biol. 10: 229-237.
11. Ringø,E. and Olsen,R.E. (1991) Do charr have selective absorption of fatty acids? Fisk. Dir. Skr., Ser.Ernæring. IV: 65-72.
12. Olsen,R.E. and Ringø,E. (1992) Lipids of Arctic charr, Salvelinus alpinus (L.) II. Influence of dietary fatty acids on the elongation and desaturation of linoleic acid and linolenic acid). Fish.Physiol.Biochem 9: 393-399.
13. Ringø,E., Jøstensen, J.P. and Olsen, R.E. (1992) Production of eicosapentaenoic acid by a freshwater Vibrio. Lipids. 27: 564-566.
14. Gislason,G, Olsen,R.E. and Ringø,E. (1994) Lack of growth stimulating effect of lactic acid on Atlantic salmon (Salmo salar). Aquacult.Fish.Manage. 25: 861-862.
15. Ringø,E. and Olsen,R.E. (1994) Lipids of Arctic charr (Salvelinus alpinus L.) - A review. Aquacult.Fish.Manage. 25: 823-838.
16. Ringø,E., Olsen,R.E. and Castell,J.D. (1994) Effect of dietary lactate on growth and chemical composition of Arctic charr Salvelinus alpinus. J.World Aquacult.Soc. 25: 483-486.
17. Gislason,G., Olsen,R.E. and Ringø,E. (1996) Comparative effect of dietary Na+-lactate on Actic charr and Atlantic salmon. Aquaculture Research, 27: 429-435.
18. Olsen,R.E. and Mortensen,A. (1997) The influence of dietary astaxanthin and temperature on flesh carotenoid deposition in Arctic charr (Salvelinus alpinus L.). Aquaculture Research. 28: 51-58.
19. Olsen,R.E. & Henderson,R.J. (1997) Muscle fatty acid composition and oxidative stress indices of Arctic charr (Salvelinus alpinus L.) in relation to dietary polyunsaturated fatty acid levels and temperature. Aqauculture Nutrition, 3: 227-238.
20. Ringø,E., Olsen,R.E., Øverli,Ø. & Løvik,F. (1997) Effect of dominance hierarchy formation on aerobic microbiota associated with gastrointestinal mucosa of subordinate and dominant individuals of Arctic charr, Salvelinus alpinus (L.). Aquaculture Research. 28: 901-904.
21. Olsen,R.E. & Ringø,E. (1997) Lipid digestibility in fish. A review. Recent Reseach Developments in Lipid Research, Transworld Research 1: 199-265.
22. Olsen,R.E., Henderson,R.J. & Ringø,E. (1998) The digestion and selective absorption of dietary fatty acids in Arctic charr, Salvelinus alpinus. Aquaculture Nutrition. 4: 13-21.
23. Ringø,E., Bendiksen,H.R, Gausen, S.J., Sundsfjord, A. & Olsen,R.E. (1998) The effect of dietary fatty acids on lactic acid bacteria associated with the epithelial mucosa and from faecalia of Arctic charr, Salvelinus alpinus (L.). J.Appl.Microbiol. 85: 855-864.
24. Olsen, R.E. & Ringø, E. (1998) The influence of temperature on the apparent nutrient and fatty acid digestibility of Arctic char (Salvelinus alpinus L.). Aquaculture Research, 29: 695-701.
25. Olsen,R.E., Løvaas,E. & Lie,Ø. (1999) The influence of temperature, dietary polyunsaturated fatty acids, α-tocopherol and spermine on fatty acid composition and indices of oxidative stress and fatty acid composition in Arctic char, Salvelinus alpinus (L.). Fish Physiol.Biochem. 20(1): 13-29.
26. Ringø, E. & Olsen, R.E. (1999) The effect of diet on aerobic bacterial flora associated with intestine of Arctic charr (Salvelinus alpinus L.). J.Appl.Microibiol. 86: 22-28.
27. Olsen, R.E., Myklebust, R., Kaino, T. & Ringø, E. (1999). Lipid digestibility and ultrastructural changes in the enterocytes of Arctic char fed linseed oil and soybean lecithin. Fish Physiol. Biochem. 21: 35-44.
28. Øverli, Ø., Olsen, R.E., Løvik, F. & Ringø, E. (1999). Dominance hierarchies in Arctic charr (Salvelinus alpinus L.): differential cortisol profiles of dominant and subordinate individuals. Aquacult.Res. 30: 259-264.
29. Olsen, R.E. & Ringø,E. (1999) Dominance hierarchies formation in Arctic char (Salvelinus alpinus L.). Nutrient digestibility of subordinate and dominant fish. Aquacult. Res. 30: 667-671.
30. Olsen, R.E., Myklebust, R., Ringø, E. & Mayhew, T:W: (2000) The influences of dietary linseed oil and saturated fatty acids on caecal enterocytes in Arctic char (Salvelinus alpinus L.): a quantitative ultrastructural study. Fish Physiol. Biochem. 22: 207-216.
31. Ringø, E., Bendiksen, H.R., Wesmajervi, M.S., Olsen, R.E., Jansen, P.A. & Mikkelsen, H. (2000) Lactic acid bacteria associated with the digestive tract of Atlantic salmon (Salmo salar L.). J.Appl.Microbiol. 89: 317-322.
32. Ringø, E., Lødemel, J.B., Myklebust, R., Kaino, T., Mayhew, T.M. & Olsen, R.E. (2001) Epithelium-associated bacteria in the gastrointestinal tract of Arctic charr (Salvelinus alpinus L.). An electron microscopic study. J.Appl.Microbiol. 90: 285-293.
33. Olsen, R.E., Myklebust, R., Kryvi, H., Mayhew, T.M. & Ringø, E. (2001) Damaging effect of dietary inulin on intestinal enterocytes in Arctic charr (Salvelinus alpinus L.). Aquacult. Res. 32: 931-934.
34. Ringø, E., Wesmajervi, M.S., Bendiksen, H.R., Berg, A. Olsen, R.E., Johansen, T., Mikkelsen, H., Seppola, M., Strøm, E. And Holzapfel, W. (2001) Identification and characterization of Carnobacteria isolated from fish intestine. System. Appl. Microbiol. 24: 183-191.
35. Lødemel, J.B., Mayhew, T.M., Myklebust, R., Olsen, R.E., Espelif, S. & Ringø, E. (2001) Effect of three dietary oils on disease susceptibility in Arctic charr (Salvelinus alpinus L.) during cohabitant challenge with Aeromonas salmonicida subsp. salmonicida. Aquacult. Res. Aquacult. Res. 24: Aquacult. Res. 32: 935-945.
36. Ringø, E., Lødemel, J.B., Myklebust, R., Jensen, L., Lund, V., Mayhew, T.M. and Olsen, R.E. (2002) The effects of soybean, linseed and marine oils on aerobic gut microbiota of Arctic charr (Salvelinus alpinus L.) prior to and post challenge with Aeromonas salmonicida subsp. salmonicida. Aquacult. Res. 33: 591-606.
37. Ringø,E., Seppola, M., Berg, A., Olsen, R.E., Schillinger, U. And Holzapfel, W. (2002) Characterization of Carnobacterium divergens Strain 6251 isolated from intestine of Arctic charr (Salvelinus alpinus L.). System. Appl. Microbiol. 25: 120-129.
38. Kiessling, A., Olsen, R.E. and Buttle, L. (2003) Given the same dietary inclusion Atlantic salmon, Salmo salar (L.) display higher blood levels of canthaxanthin than astaxanthin. Aquaculture Nutrition, 9: 203-217.
39. Olsen, R.E., Sundell, K., Hansen, T., Hemre, G.-I., Myklebust, R., Mayhew, T.M. and Ringø, E. (2003) Acute stress alters the intestinal lining of Atlantic salmon, Salmo salar L. An electron microscopical study. Fish Physiol. Biochem. 26: 211-221.
40. Sundell, K., Jutfelt, F., Agustsson, T., Olsen, R.E., Sandblom, E., Hansen, T. and Björnsson, T.B. (2003) Intestinal transport mechanisms and plasma cortisol levels during normal and out-of season parr-smolt transformation of Atlantic salmon, Salmo salar. Aquaculture 222: 265-285.
41. Ringø, E., Olsen, R.E., Mayhew, T.M. and Myklebust, R. (2003) Electron microscopy of the intestinal microflora in fish. Aquaculture. 227: 395-415.
42. Olsen, R.E., Dragsnes, B.T., Myklebust, R. and Ringø, R. (2004) Effect of soybean oil and soybean lecithin on intestinal lipid composition and lipid droplet accumulation of rainbow trout, Oncorhynchus mykiss Walbaum. Fish Physiol. Biochem. 29: 181-192.
43. Olsen, R.E., Henderson, R.J., Suotanama, J., Hemre, G.-I., Ringø, E., Melle, W. and Tocher, D.R. (2004) Atlantic salmon, Salmo salar, utilizes wax ester-rich oils from Calanus finmarchichus effectively. Aquaculture 240: 433-449.
44. Ringø, E., Jutfeldt, F., Kanapathippillai, P., Bakken, Y., Sundell, K., Glette, J., Olsen, R.E., Mayhew, T.M. and Myklebust, R. (2004) Damaging effect of the fish pathogen Aeromonas salmonicida ssp. salmonicida on intestinal enterocytes of Atlantic salmon (Salmo salar L.). Cell & Tiss. Res. 318: 305-312.
45. Oxley, A., Torsteinsen, B.E., Rustan, A. And Olsen, R.E. (2005) Enzyme activities of intestinal triacylglycerol and phosphatidylcholine biosynthesis in Atlantic salmon (Salmo salar L.) Comp. Biochem. Physiol. B. 141: 77-87.
46. Geurden, I., Cuvier, A., Gondouin, E., Olsen, R.E., Ruohonen, K., Kaushik, S. and Boujard, T. (2005) Rainbow trout can discriminate between feeds with different oil sources. Physiol. Behav. 85: 107-114.
47. Saha, M.R., Ross, N.W., Gill, T.A., Olsen, R.E. and Lall, S.P. (2005) Development of a method to assess binding of astaxanthin to Atlantic salmon (Salmo salar) muscle proteins. Aquault. Res. 36: 336-343.
48. Olsen, R.E., Kiessling, A., Milley, J.E., Ross, N.W. and Lall, S.P. (2005) Lipid source, not bile acids, affect absorption of astaxanthin in Atlantic salmon, Salmo salar L. Aquaculture, 250: 804-812.
49. Olsen, R.E., Sundell, K., Myklebust, R and Ringø, E. (2005) Acute stress alters intestinal function of rainbow trout, Oncorhynchus mykiss (W). Aquaculture. 250: 480-495.
50. Oxley, A., Tocher, D.R., Torstensen, B.E. and Olsen, R.E. (2005) Fatty acid utilisation and metabolism in caecal enterocytes of rainbow trout (Oncorhynchus mykiss) fed dietary fish or copepod oil. Biochem. Biophys. Acta. 1737: 119-129.
51. Seppola, M., Olsen, R.E., Sandaker, E., Kanapathippillai, P. Holzapfel, W. and Ringø, E. (2006) Random amplification of polymorphic DNA (RAPD) typing of carnobacteria isolated from hindgut chamber and large intestine of Atlantic cod (Gadus morhua L.). System. Appl. Microbiol. 29: 131-137.
52. Ringø,E., Mikkelsen,H., Kaino,T., Olsen,R.E., Mayhew,T.M. and Myklebust,R. (2006) Endocytosis of indigenous bacteria and cell damage caused by Vibrio anguillarum in the foregut and hindgut of spotted wolffish (Anarhichas minor Olafsen) fry. An electron microscopical study. Aquacult. Res. 37, 647-651
53. Opstad, I., Suontama, J., Langmyhr, E. And Olsen, R.E: (2006) Growth, survival and development of Atlantic cod (Gadus morhua) weaned with diets made of alternative protein sources.ICES J. Mar. Sci. 63, 320-325
54. Oppedal, F., Berg, A., Olsen, R.E., Taranger, G.L. and Hansen, T. (2006) Photoperiod in seawater influence seasonal growth and chemical composition in autumn sea-transferred Atlantic salmon (Salmo salar L.) given two vaccines. Aquaculture. 254, 396-410.
55. Jutfelt, F., Olsen, R.E., Glette, J., Ringø, E. and Sundell, K. (2006) Translocation of viable Aeromonas salmonicida across the intestine of rainbow trout, Oncorhynchus mykiss (Walbaum). J. Fish Dis. 29: 255-262.
56. Ringø, E., Sperstad, S., Myklebust, R., Mayhew, T.M. and Olsen, R.E. (2006) The effect of dietary inulin on aerobic bacteria associated with hindgut of Arctic charr (Salvelinus alpinus L.). Aquacult. Res. 37: 891-897.
57. Olsen, R.E., Suontama, J., Langmyhr, E, Mundheim, H., Ringø, E., Melle, W., Malde, M.K. and Hemre, G.-I. (2006) The replacement of fishmeal to Antarctic krill, Euphausia superba in diets for Atlantic salmon, Salmo salar. Aquacult. Nutr. 12: 280-290.
58. Olsen, R.E. and Baker, R. (2006) Lutein does not influence flesh pigmentation in Atlantic salmon (Salmo salar L.). Aquaculture, 258: 558-564.
59. Saha M.R., Lall, S.P., Ross, N.W. and Olsen, R.E. (2006) Astaxanthin binding to solubilized muscle proteins of Atlantic salmon (Salmo salar L.), haddock (Melanogrammus aeglefinus L.) and Atlantic halibut (Hippoglossus hippoglossus L.). Comp. Biochem. Physiol. B. 144; 488-495.
60. Karlsen, Ø., Suontama, J. and Olsen, R.E. (2006) Effect of Antarctic krillmeal on quality of farmed Atlantic cod (Gadus morhua L.). Aquacult. Res. 37; 1676-1684.
61. Ringø, E., Sperstad, S., Myklebust, R., Mayhew, T.M., Mjelde, A., Melle, W. and Olsen, R.E. (2006) The effect of dietary krill supplementation on epithelium-associated bacteria in the hindgut of Atlantic salmon (Salmo salar L.): a microbial and electron microscopical study. Aquacult. Res. 37: 1644-1653.
62. Moren, M., Suontama, J., Hemre, G.-I., Karlsen, Ø., Olsen, R.E., Mundheim, H. and Julshamn, K. (2006) Element concentrations in metals from krill and amphipods, - Possible alternative protein sources in complete diets for farmed fish. Aquaculture, 261: 174-181.
63. Haugen, T., Kiessling, A., Olsen, R.E., Rørå, M.B., Slinde, E. And Nortvedt, R. (2006) Seasonal variations in muscle growth dynamics and selected quality attributes in Atlantic halibut (Hippoglossus hippoglossus L.) fed dietary lipids containing soybean oil and/or herring oil under different raring regimes. Aquaculture 261: 565-579
64. Suontama, J., Kiessling, A., Melle, W., Waagbø R., Mundheim, H. and Olsen, R.E. (2007) Protein from Northern krill (Thysanoessa inermis), Antarctic krill (Euphausia superba) and the Arctic amphipod (Themisto libellula) can partially replace fish meal in diets to Atlantic salmon (Salmo salar) without any effect on product or sensory quality. Aquaculture Nutrition, 13: 50-58.
65. Oxley, A., Jutfelt, F., Sundell, K. and Olsen, R.E. (2007) Sn-2-monoacylglycerol, not glycerol, is preferentially utilized for triacylglycerol and phosphatidylcholine biosynthesis in Atlantic salmon (Salmo salar L.) intestine. Comp. Biochem. Physiol. B. 146: 115-123.
66. Ringø, E., Salinas, I., Olsen, R.E., Nyhaug, A., Myklebust, R. And Mayhew, T.M. (2007) Histological changes in intestine of Atlantic salmon (Salmo salar L.) following in vitro exposure to pathogenic and probiotic bacterial strains. Cell Tiss. Res. 328, 109-116.
67. Suontama, J., Karlsen, Ø., Moren, M., Langmyhr, E., Mundheim, H., Ringø, E. and Olsen, R.E. (2007) Growth, feed conversion and chemical composition of Atlantic salmon (Salmo salar L.) and Atlantic halibut (Hippoglossus hippoglossus L.) fed diets supplemented with krill or amphipods. Aquacult. Nutr. 13: 241-255.
68. Moren, M., Malde, M., Olsen, R.E., Hemre, G.I., Dahl, L., Karlsen, Ø. and Julshman, K. (2007) Fluorine accumulation in Atlantic salmon (Salmo salar), Atlantic cod (Gadus morhua), rainbow trout (Onchorhyncus mykiss) and Atlantic halibut (Hippoglossus hippoglossus) fed diets with krill or amphipod meals and fish meal based diets with sodium fluoride (NaF) inclusion. 269: 525-531.
69. Ringø, E., Myklebust, R., Mayhew, T.M. and Olsen, R.E. (2007) Bacterial translocation and pathogenesis in the digestive tract of larvae and fry. Aquaculture, 268: 251-264.
70. Fridell, F., Gadan, K., Sundth, H., Taranger, G.L., Glette, J., Olsen, R.E., Sundell, K. and Evensen, Ø. (2007) Effect of hypereoxygenation and low water flo won the primary stress response and susceptibility of Atlantic salmon Salmo salar L. to experimental challenge with IPN virus. Aquaculture, 270: 23-35.
71. Olsen, R.E., Hansen, A.-C., Rosenlund, G., Hemre, G.I., Mayhew, T.M., Knudsen, D.L., Eroldoğan, O.T., Myklebust, R. and Karlsen, Ø. (2007) Total replacement of fish meal with plant proteins in diets for Atlantic cod (Gadus morhua)L.) II - Health aspects. Aquaculture, 272: 612-624.
72. Jutfelt, F., Olsen, R.E., Björnsson, B.T. and Sundell, K. (2007) Parr-smolt transformation and dietary vegetable lipids affect intestinal nutrient uptake, barrier function and plasma cortisol levels in Atlantic salmon. Aquaculture, 273: 298-311.
73. Bogevik, A.S., Tocher, D.R., Waagbø, R. and Olsen. R.E. (2008) Triacylglycerol-, wax ester- and sterol ester-hydrolases in midgut of Atlantic salmon (Salmo salar). Aquacult. Nutr. 14: 93-98.
74. Van der Meeren, T., Olsen, R.E., Hamre, K. and Fyhn, H.J. (2008) Biochemical composition of copepods for evaluation of feed quality in juvenile production of marine fish. Aquaculture, 274: 375-397.
75. Salinas, I., Myklebust, R., Esteban M.A., Olsen R.E., Meseguer J. and Ringø, E. (2008) In vitro studies of Lactobacillus delbrueckii subsp. lactis in Atlantic salmon (Salmo salar L.) foregut: Tissue responses and evidence of protection against Aeromonas salmonicida subsp. salmonicida epithelial damage. Vet. Mictobiol. 128: 167-177.
76. Olsen, R.E., Sundell, K., Ringø,E., Myklebust, R., Hemre, G.-I., Hansen, T. and Karlsen, Ø. 2008 The acute stress response in fed and food deprived Atlantic cod, Gadus morhua L. Aquaculture, 280: 232-241.
77. Bogevik, A.S., Olsen, R.E. & Tocher, D.R. (2008) Utilization and metabolism of palmityl and oleoyl fatty acids and alcohols in caecal enterocytes of Atlantic salmon (Salmo salar L.). Aquaculture Nutrition 14: 270-280.
78. Bogevik, A.S., Oxley, A. & Olsen, R.E. (2008) Hydrolysis of acyl-homogeneous and fish oil triacylglycerols using desalted midgut extract from Atlantic salmon, Salmo salar. Lipids 43: 655-662
79. Ringø, E. and Olsen, R.E. (2008) Gut health in aquatic species. World Nutrition Forum. Pp. 79-105.
80. Bogevik, A.S., Tocher, D.R. Langmyhr, E., Waagbø, R. and Olsen, R.E. (2009) Atlantic salmon (Salmo salar) postsmolts adapt lipid digestion according to elevated dietary wax esters from Calanus finmarchicus. Aquacult. Nutr. 10: 94-103.
81. Geurden, I., Jutfelt, F., Olsen, R.E. and Sundell, K. (2009) A vegetable oil feeding history affects digestibility and intestinal fatty acid uptake in juvenile rainbow trout Oncorhyncus mykiss., Comp. Biochem. Physiol. 152A: 552-559.
82. Glover,K.A., Otterå,H., Olsen,R.E., Slinde,E., Taranger,G.L., Skaala,Ø. (2009). A comparison of farmed, wild and hybrid Atlantic salmon (Salmo salar L.) reared under farming conditions. Aquaculture, 286: 203-210.
83. Sundh, H, Olsen, R.E.., Fridell, F., Gadan, K., Evensen, Ø., Glette, J., Taranger, G.L., Myklebust, R., Sundell, K. (2009). The effect of hyperoxygenation and reduced flow in fresh water and subsequent infectious pancreatic necrosis virus challenge in sea water, on the intestinal barrier integrity in Atlantic salmon, Salmo salar L.J. Fish Dis. 32: 687-698.
84. Otterå, Håkon, Karlsen, Ø., Slinde, E., Olsen, R.E. (2009). Quality of wild-captured saithe (Pollachius virens L.) fed formulated diets for 8 months. Aquacult. Res. 40: 1310-1319
85. Oxley,A., Bogevik,A.S., Henderson,R.J., Waagbø,R., Tocher, D.R. and Olsen, R.E. (2009). Digestibility of Calanus finmarchicus wax esters in Atlantic salmon (Salmo salar) freshwater presmolts and seawater postsmolts maintained at constant water temperature. Aquacult. Nutr. 15: 459-469
86. Zahl, I.H., Kiessling, A., Samuelssen, O.B. and Olsen, R.E. (2010) Anaesthesia induces stress in Atlantic salmon (Salmo salar), Atlantic cod (Gadus morhua) and Atlantic halibut (Hippoglossus hippoglossus). Fish Physiol. Biochem. 36: 719-730.
87. Oxley, A., Jolly, C., Eide, T., Jordal, A.-E.O, Svardal, A., Olsen, R.E. (2010) The combined impact of plant-derived dietary ingredients and acute stress on the intestinal arachidonic acid cascade in Atlantic salmon (Salmo salar). Br.J.Nutr. 103: 851-861
88. Ringø, E., Løvmo, L., Kristiansen, M., Bakken, Y., Salinas, I., Myklebust, R., Olsen, R.E. and Mayhew, T.M. (2010) Lactic acid bacteria vs pathogens in the gastrointestinal tract of fish: A review. Aquacult. Res. 41: 451-467.
89. Ringø,E., Olsen, R.E., Bakke,-McKellup, A.M., Gifstad, T.Ø., Aursand,, M., Amlund, H., Hemre, G.-I. (2010) Prebiotics in Aquaculture: a review. Aquacult. Nutr. 16: 117-136.
90. Fjelldal, P.G., Nordgarden, U., Wargelius, A., Taranger, G.L., Waagbø, R. and Olsen, R.E. (2010) Effects of vegetable feed ingredients on bone health in Atlantic salmon. J. Appl. Ichthyol. 26: 327-333.
91. Olsen, R.E., Waagbø, R., Ringø, E. and Lall, S.P. (2010) Alternative Marine Lipid Resources. In: Fish Oil Replacement and Alternative Lipid Sources in Aquaculture Feeds. (Turchini, G.M., Ng, W.-K. and Tocher, D.R., Eds). Ch.9. pp 267-324. Taylor & Francis, CRC Press, ISBN: 978-1-4398-0862-7.
92. Mininghetti,M., Olsen,R.E. and Tocher, D.R. (2010) Molecular cloning, characterization and nutritional regulation of key enzymes required for the effective utilization of marine wax esters by Atlantic salmon (Salmo salar L.). Aquacult. Nutr. 16: 483-495.
93. Bogevik, A.S., Henderson, R.J., Mundheim, H., Waagbø, R. And Olsen, R.E. (2010). The influence of temperature on the apparent lipid digestibility in Atlantic salmon (Salmo salar) fed Calanus finmarchicus at two fat levels. Aquaculture. 309; 143-151.
94. Sundh, H., Kvamme, B.O., Fridell, F., Olsen, R.E., Ellis, T., Taranger, G.L. and Sundell, K. (2010) Intestinal barrier function of Atlantic salmon (Salmo salar) post smolts is reduced by common sea cage envoironments and suggested as a possible physiological welfare indicator. BMC Physiology, 10: 1-13 doi:10.1186/1472-6793-10-22.
95. Olsen,R.E. and Skilbrei, O.T. (2010) Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn. Aquacult. Environm. Interact. 1: 167-174
96. Colombo-Hixson, S.A., Olsen, R.E., Milley, J.E. and Lall, S.P. (2011) Lipid and fatty acid digestibility in Calanus copepod and krill oil by Atlantic halibut (Hippoglossus hippoglossus L.) Aquaculture 313; 115-122.
97. Tibbetts, S.M., Olsen, R.E. and Lall, S.P. (2011) Effects of partial or total replacement of fish meal with freeze-dried krill (Euphausia superba) on growth and nutrient utilization of juvenile Atlantic cod (Gadus morhua) and Atlantic halibut (Hippoglossus hippoglossus) fed the same practical diets. Aquacult. Nutr. 17: 287-303.
98. Bogevik, A.S., Henderson, R.J., Mundheim, H., Olsen, R.E. and Tocher, D.R. 2011 The effect of temperature and dietary fat levels on tissue lipid composition in Atlantic salmon (Salmo salar) fed wax ester-rich oil from Calanus finmarchicus. Aquacult. Nutr. 17: e781-e788.
99. Torrissen,O., Olsen, R.E., Toresen,R., Hemre, G.-I., Tacon, A.G.J., Asche, F., Hardy, R.W. and Lall, S.P. (2011) Atlantic salmon (Salmo salar) – the super-chicken of the sea ? Rev. Fish. Sci. 15: 257-278
100. Merrifield,D., Olsen,R.E., Myklebust,R. and Ringø,E. (2011) Chapter 12. Dietary effect of soybean (Glycine max) products on gut histology and microbiota in fish. In: Soybean and Nutrition (Hany E.S. (ed). InTech pp. 231-250.
101. Sundh, H., Calabrese, S., Jutfelt, F., Niklasson, L., Olsen, R.E. and Sundell, K. (2011). Translocation of infectious pancreatic 1 necrosis virus across the intestinal epithelium of Atlantic salmon (Salmo salar L.). Aquaculture. 321: 85-92.
102. Olsen, R.E., Oxley, A., Svardal, A., Eide, T. and Wargelius, A. (2012) Stress and expression of cyclooxygenases (cox1, cox2a, cox2b) and intestinal eicosanoids, in Atlantic salmon, Salmo salar. Fish Physiol. Biochem. 38: 951-962.
103. Remen,M., Oppedal,F., Torgersen,T., Imsland,A.K. and Olsen,R.E (2012) Effects of cyclic environmental hypoxia on physiology and feed intake of post-smolt Atlantic salmon: Initial responses and acclimation. Aquaculture 326-329: 148-155.
104. Askarian,F., Zhou,Z., Olsen,R.E., Sperstad, S., Ringø, E. (2012) Culturable autochthonous gut bacteria in Atlantic salmon (Salmo salar L.) fed diets with or without chitin. Characterization by 16S rRNA gene sequencing, ability to produce enzymes and in vitro growth inhibition of four fish pathogens. Aquaculture. 326-329: 1-8.
105. Ringø,E., Olsen,R.E., Gonzalez Vecino, J.L., Wadsworthy, S. And Song, S.K. (2012) Use of immunostimulants and nucleotides in aquaculture: a review. Mar. Sci. Res. Development 1: 1-22.
106. Ringø,E., Zigang, Z., Olsen, R.E. and Song, S.K. (2012) Use of chitin and krill in aquaculture – the effect on gut microbiota and the immune system. A review. Aquacult. Nutr. 18: 117-131.
107. Folkedal,O., Torgeresen,T., Olsen,R.E., Ferno,A., Nilsson,J., Oppedal,F., Stien,L.H. and Kristiansen,T.S. (2012) Duration of effects of acute environmental changes on food anticipatory behaviour, feed intake, oxygen consumptioon, and cortisol release in Atlantic salmon parr. Physiol. Behavior 105: 283-291.
108. Folekdal, O., Stien, L.H., Torgersen, T., Oppedal, F., Olsen, R.E., Fosseidengen, J.E., Braithwaite, V.A. and Kristiansen, T.S. 2012. Food anticipatory behaviour as an indicator of stress response and recovery in Atlantic salmon post-smolt after exposure to acute temperature fluctuation. Physiol. Behav. 105: 350-356.
109. Nilsson,J., Stien,L.H., Fosseidengen,J.E., Olsen,R.E. and Kristiansen,T.S. (2012) From fright to anticipation: Reward conditioning versus habituation to a moving dip net in farmed Atlantic cod (Gadus morhua). Appl. Anim. Behav. Sci. 138: 118-124.
110. Hyldig,G., Jørgensen,B.M., Undeland, I., Olsen, R.E., Jonsson, A., Nielsen, H.H. (2012). Sensory properties of frozen herring (Clupea harengus) from different catch seasons and locations. Food Sci. 77: S288-S293
111. Olsen,R.E., Oppedal,F., Tenningen,M. And Vold,A. (2012) Physiological response and mortality caused by scale loss in Atlantic herring. Fish. Res. 129-130: 21-27
112. Tenningen,M., Vold,A. And Olsen,R.E. (2012) The response of herring to high crowding densities in purse-seines: survival and stress reaction. ICES J.Mar.Sci. 69: 1523-1531.
113. Hansen,A.C., Rosenlund,G., Karlsen,Ø., Olsen, R.E. and Hemre, G.I. (2012) Marine ash-products influence growth and feed utilization when Atlantic cod Gadus morhua L., are fed plant-based diets.. J. Appl. Ichthyol. 1-9. Doi:10.1111/jai.12087.