Kim T. Halvorsen

Research Scientist

Institute of Marine Research
Marine Ecosystem Acoustics Group
Flødevigen Research Station
Nye Flødevigveien 20, 4817 His, NORWAY
Tel. 47 40 01 66 01

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Ph.D. (2017) in Marine Biology, University of Oslo (Norway)
M.Sc. (2010) in Sustainable Coastal Development, Norwegian University of Science and Technology
B.Sc. (2008) in Biology, Norwegian University of Science and Technology

Areas of expertise and interest

My main interest is how fisheries and other human activities interact with species’ life history traits, behaviour and reproductive biology in an integrated ecological and evolutionary perspective. In this context, most of my previous and current research is conducted on different wrasse species commercially harvested and used as cleaner fish in salmonid aquaculture. This involves field investigations, otolith analyses and mark-recapture studies in and outside marine protected areas. Moreover, I’m involved in studies of the effects of fishing on sexual selection and sex-ratios in European lobster using genetic parentage assignment. During my masters I studied evolution, biogeography and population genetics of gadids.

Active projects

Population dynamics of wild wrasse populations along the Norwegian coast (led by Anne Berit Skiftesvik)


Halvorsen, K. T., Árnason, E., Smith, P. J. & Mork, J. 2012. Mitochondrial DNA differentiation between the antitropical blue whiting species Micromesistius poutassou and Micromesistius australis. Journal of Fish Biology 81: 253-269
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Halvorsen, K.T., T.K. Sørdalen, C.M.F. Durif, H. Knutsen, E.M. Olsen, A.B. Skiftesvik, T.E. Rustand, R.M. Bjelland & L.A. Vøllestad. 2016. Male biased sexual size dimorphism in the nest building corkwing  wrasse (Symphodus melops): implications for a size regulated fishery. ICES Journal of Marine Science 73: 2586-2594.
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Halvorsen, K.T., T.K. Sørdalen, L.A. Vøllestad, A.B. Skiftesvik, S.H. Espeland & E.M. Olsen. 2017. Sex- and size-selective harvesting of corkwing wrasse (Symphodus melops) cleaner fish in salmonid aquaculture. ICES Journal of Marine Science 74: 660-669.
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Halvorsen, K.T., T. Larsen, T. K.Sørdalen, L.A. Vøllestad, H. Knutsen & E.M. Olsen. 2017. Impact of harvesting cleaner fish for salmonid aquaculture assessed from replicated coastal marine protected areas. Marine Biology Research (in press).
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Halvorsen, K.T. 2017. Selective harvesting and life history variability of corkwing and goldsinny wrasse in Norway: Implications for management and conservation. PhD thesis. University of Oslo.
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Publications in preparation

Sørdalen, T.K. Halvorsen, K.T., Harrison, H., Ellis, C., Vøllestad, L.A., Knutsen, H., Sannæs, H., Olsen, E.M. Fishing weakens sexual selection in European lobster; inferred by a parentage study inside and outside a coastal marine reserve

Olsen, E.M., Halvorsen K.T., Larsen, T., Kuparinen, A. Life history variability of an intermediate predator (Ctenolabrus rupestris) in northern European marine protected areas and harvested areas.

Faust, E., Halvorsen, K.T., Knutsen, H., André C. Genetic structure of corkwing wrasse (Symphodus melops): Implications for large scale, long distance translocations over genetic barriers.

Last updated: June 13, 2017