2019

• Jacobsen, Julianne Valla; Steen, Klemet; Nilssen, Kjell J.. (2019) Anaesthetic efficacy of Aqui-S, Benzoak, and MS-222 on lumpfish (Cyclopterus lumpus) fries. Impact from temperature, salinity, and fasting. PLOS ONE
  Academic article
• Arnekleiv, Jo Vegar; Davidsen, Jan Grimsrud; Sheehan, T. F.; Lehnert, S. J.; Bradbury, I.R.; Rønning, Lars. (2019) Demographic and genetic description of Greenland´s only indigenous Atlantic salmon Salmo salar population. Journal of Fish Biology
  Academic article

2016

• Nilssen, Kjell Joar; Ngasainao, M.R.; Sharma, J.G.; Srivastava, S.K.; Chandra, S.; Moirangthem, K.S.. (2016) Activities of digestive enzymes in relation to ingested natural food in three carp species of the Himalayan River Ladhiya, northern India. Aquaculture Nutrition
  Academic article

2014

• Urke, Henning Andre; Arnekleiv, Jo Vegar; Nilsen, Tom Ole; Nilssen, Kjell J.. (2014) Development of seawater tolerance and subsequent downstream migration in wild and stocked young-of-the-year derived Atlantic salmon Salmo salar smolts. Journal of Fish Biology
  Academic article
• Urke, Henning Andre; Arnekleiv, Jo Vegar; Nilsen, Tom Ole; Nilssen, Kjell J.; Rønning, Lars; Ulvund, John Birger. (2014) Long‐term hypo‐osmoregulatory capacity in downstream migrating Atlantic salmon Salmo salar L. smolts. Journal of Fish Biology
  Academic article

2010

• Kvalsvik, Birgitte Grongstad; Nilssen, Kjell J.; Arukwe, Augustine. (2010) Melatonin exposure of E2 stimulated Salmon hepatocyte vitellogenin production. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
  Masters thesis
• Tran, Linda Huong Thi; Nilssen, Kjell J.. (2010) Stress gives less?: Cortisol effects on E2 induced vitellogenin expression in salmon hepatocytes. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
  Masters thesis
• Bunes, Helene; Nilssen, Kjell J.. (2010) Virkeevne og stressreduserende effect til tre typer anestesimidler på rohu (Labeo Rohita). NTNU, Institutt for biologi NTNU, Institutt for biologi
  Masters thesis
• Berg, Ole Kristian; Finstad, AG; Olsen, Per Harald; Arnekleiv, Jo Vegar; Nilssen, Kjell J.. (2010) Dwarfs and cannibals in the Arctic: production of Arctic char (Salvelinus alpinus (L.)) at two trophic levels. Hydrobiologia
  Academic article

2009

• Nilssen, Kjell J.. (2009) Brev fra Hotel Annapurna, Kathmandu.
  Popular scientific chapter/article
• Pokharel, Bimal; Nilssen, Kjell J.; Lein, Haakon. (2009) Livelihood Impact of Hydropower Development and River Diversions in the Downstream of River Basin. A Retrospective Case Study of Khimti River, Eastern Nepal. NTNU, Institutt for biologi NTNU, Institutt for biologi
  Masters thesis

2008

• Hveding, Øistein Preus; Nilssen, Kjell J.. (2008) Efficacy of three anesthetics in the Himalayan carp snow-trout (Schizothorax plagiostomus) captured in Khimti Khola River in the eastern mid-hills of Nepal. NTNU, Institutt for biologi NTNU, Institutt for biologi
  Masters thesis

2006

• Nilssen, Kjell J.. (2006) Røya på Svalbard. Biologi, forvaltning og framtid. Bio Kompetanse as Bio Kompetanse as
  Non-fiction book
• Tønne, Håkon; Nilssen, Kjell J.. (2006) Sjørøyebestand og forekomst av anadrome rekrutter i et tidligere garnbelastet vassdrag på Spitsbergen, Svalbard. NTNU, Institutt for biologi NTNU, Institutt for biologi
  Masters thesis

2005

• Skjevling, Øivind; Nilssen, Kjell J.. (2005) Effekten av b-naftoflavon (BNF) på sirkulatorisk melatoninnivå og hepatocytters nedbrytning av melatonin hos brunørret (Salmo trutta). Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis
• Sjursen, Aslak Darre; Nilssen, Kjell J.. (2005) Populasjonsdynamikk og kroppsvekst hos vandrende røyeyngel og parr fra Bjørnøya. Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis
• Olsen, Anders Waldemar; Nilssen, Kjell J.. (2005) Insekticidet o,p`DDDs virkning på stressindusert frigjøring av kortisol hos arktisk røye (Salvelinus alpinus). Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis
• Kamsvåg, Christer; Nilssen, Kjell J.. (2005) Stressrespons hos svalbardrøye (Salvelinus alpinus L.) i oppdrett - plasma kortisolnivå etter vannstandreduksjon og bedøvelse. Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis
• Andersen, Lars Erik; Nilssen, Kjell J.. (2005) Virkeevne og stressreduserende kapasitet til fire typer anestesimidler på arktisk røye (Salvelinus alpinus). Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis
• Skjulsvik, Jon Erik; Nilssen, Kjell J.. (2005) Plasma melatonin profiles in Atlantic salmon (Salmo salar) subjected to natural or artificial light-regimes. Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis
• Johnsen, Anne Berit; Nilssen, Kjell J.. (2005) Sjøtoleranse og atferd hos Svalbardrøye (Salvelinus alpinus L.). Institutt for biologi, NTNU Institutt for biologi, NTNU
  Masters thesis

2001

• Gulseth, Odd A.; Nilssen, Kjell J.; Iversen, Martin; Finstad, Bengt. (2001) Seawater tolerance in first-time migrants of anadromous Arctic charr (Salvelinus alpinus). Polar Biology
  Academic article
• Gulseth, Odd Alfred; Nilssen, Kjell J.; Steen, Klemet. (2001) Seawater tolerance in captive high-Arctic Svalbard charr (Salvelinus alpinus): effect of photoperiod and body size. Polar Biology
  Academic article
• Gulseth, Odd Alfred; Nilssen, Kjell J.; Iversen, Martin; Finstad, Bengt. (2001) Seawater tolerance in first-time migrants of anadromous Arctic charr (Salvelinus alpinus). Polar Biology
  Academic article
• Øvrevik, J.; Stenersen, J.; Nilssen, Kjell J.; Tollefsen, K-E. (2001) Partial characterization of a sex steroid-binding protein in plasma from Arctic charr (Salvelinus alpinus L). General and Comparative Endocrinology
  Academic article
• Gulseth, Odd Alfred; Nilssen, Kjell J.. (2001) Life-history traits of charr, Salvelinus alpinus, from a high Arctic watercourse on Svalbard. Arctic: Journal of the Arctic Institute of North America
  Academic article

2000

• Einarsdóttir, Ingibjørg; Nilssen, Kjell J.; Øren, Stein; Iversen, Martin. (2000) Temperature influence on Arctic charr (Salvelinus alpinus L.) antibody response to a cellular antigen. Polar Biology
  Academic article
• Einarsdóttir, Ingibjørg; Nilssen, Kjell J.; Iversen, Martin. (2000) Effects of rearing stress on Atlantic salmon (Salmo salar L.) antibody response to a non-pathogenic antigen. Aquaculture Research
  Academic article

1998

• Iversen, Martin; Finstad, Bengt; Nilssen, Kjell J.. (1998) Recovery from loading and transport stress in Atlantic salmon (Salmo salar L.) smolts. Aquaculture
  Academic article

1997

• Nilssen, Kjell J.; Gulseth, Odd A.; Iversen, Martin. (1997) Summer osmoregulatory capacity of the worlds nothernmost living Salmonid. American Journal of Physiology
  Academic article

1985

• Johnsen, Helge K.; Rognmo, Arne; Nilssen, Kjell J.; Blix, Arnoldus S. (1985) Seasonal changes in the relative importance of different avenues of heat loss in resting and running reindeer. Acta Physiologica Scandinavica
  Academic article

1984

• Nilssen, Kjell J.; Johnsen, Helge K.; Rognmo, Arne; Blix, Arnoldus S. (1984) Heart rate and energy expenditure in resting and running Svalbard and Norwegian reindeer. American Journal of Physiology. Regulatory Integrative and Comparative Physiology
  Academic article