Kim T. Halvorsen

Postdoctoral Research Scientist

Institute of Marine Research
Ecosystem Acoustics Group
Flødevigen Research Station
Nye Flødevigveien 20
4817 His, NORWAY
Tel. 47 40 01 66 01
Email: kim.halvorsen@imr.no

orcid.org/0000-0001-6857-2492

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Education

Ph.D. (2017) in Marine Biology, University of Oslo
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)

Publications

Mind the depth: The vertical dimension of a small-scale fishery shapes selection on species, size and sex in wrasses

Halvorsen, K.T., T. Knutsen Sørdalen, T. Larsen, H.I. Browman, T. Rafoss, J. Albretson & A.B. Skiftesvik. 2020. Mind the depth: The vertical dimension of a small-scale fishery shapes selection on species, size and sex in wrasses. Marine and Coastal Fisheries. doi: 10.1002/mcf2.10131.
Coming soon

“A cleaner break”: Genetic divergence between geographic groups and sympatric phenotypes revealed in ballan wrasse (Labrus bergylta)

Seljestad, G.W., M. Quintela E. Faust, K.T. Halvorsen, F. Besnier, E. Jansson, G. Dahle, H. Knutsen, C. Andre, A. Folkvord & K.A. Glover. 2020. “A cleaner break”: Genetic divergence between geographic groups and sympatric phenotypes revealed in ballan wrasse (Labrus bergylta). Ecology and Evolution 2020;00:1–16. doi: 10.1002/ece3.6404.
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Marine protected areas rescue a sexually selected trait in European lobster

Knutsen Sørdalen, T., K.T. Halvorsen, L.A. Vøllestad, E. Moland & E. Moland Olsen. 2020. Marine protected areas rescue a sexually selected trait in European lobster. Evolutionary Applications, doi: 10.1111/eva.12992.
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Read a story about the work

Assessment of the risk to Norwegian biodiversity from import of wrasses and other cleaner fish for use in aquaculture

VKM, E. Rueness, P.R. Berg, S. Gulla, K. Halvorsen, J. Järnegren, M. Malmstrøm, T.A. Mo, E. Rimstad, H. de Boer, K. Eldegard, K. Hindar, L.R. Hole, K. Kausrud, L. Kirkendall, I. Måren, E.B. Nilsen, E.B. Thorstad, A. Nielsen & G. Velle. 2019. Assessment of the risk to Norwegian biodiversity from import of wrasses and other cleaner fish for use in aquaculture. Opinion of the Panel on Alien Organisms and Trade in Endangered Species (CITES) of the Norwegian Scientific Committee for Food and Environment. VKM report 2019: 15, ISBN: 978-82-8259-330-4, ISSN: 2535-4019.
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Kunnskapsinnhenting Leppefisk – biologi og fiskeri 2013-2018

Skiftesvik, A.B., K. Halvorsen & T. Larsen. 2019. Kunnskapsinnhenting Leppefisk – biologi og fiskeri 2013-2018. Rapport fra Havforskningen 2019-18. ISSN:1893-4536
Read the report (In Norwegian)

Potential for managing life history diversity in a commercially exploited intermediate predator, the goldsinny wrasse (Ctenolabrus rupestris)

Olsen, E., K. Halvorsen, T. Larsen & A. Kuparinen. 2019. Potential for managing life history diversity in a commercially exploited intermediate predator, the goldsinny wrasse (Ctenolabrus rupestris). ICES Journal of Marine Science. doi:10.1093/icesjms/fsy183
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Cleaner fish escape salmon farms and hybridize with local wrasse populations

Faust, E., K.T. Halvorsen, P. Andersen, H. Knutsen, C. André. 2018. Cleaner fish escape salmon farms and hybridize with local wrasse populations. Royal Society Open Science 5: 171752. DOI: 10.1098/rsos.171752
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Harvesting changes mating behavior in European lobster

Sørdalen, T.K., K.T. Halvorsen, H.B. Harrison, C. Ellis, L.A. Vøllestad, H. Knutsen, E. Moland & E. Moland Olsen. 2018. Harvesting changes mating behavior in European lobster. Evolutionary Applications 11:963–977. DOI 10.1111/eva.12611
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Selective harvesting and life history variability of corkwing and goldsinny wrasse in Norway: Implications for management and conservation.

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.
Read the thesis

Impact of harvesting cleaner fish for salmonid aquaculture assessed from replicated coastal marine protected areas.

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 13: 359-369.
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Sex- and size-selective harvesting of corkwing wrasse (Symphodus melops) cleaner fish in salmonid aquaculture.

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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Male biased sexual size dimorphism in the nest building corkwing wrasse (Symphodus melops): implications for a size regulated fishery.

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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Mitochondrial DNA differentiation between the antitropical blue whiting species Micromesistius poutassou and Micromesistius australis.

Halvorsen, K.T., E. Árnason, P.J. Smith & J. Mork. 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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Marine protected areas improve body growth of European lobster

Sørdalen, T.K., Halvorsen K.T. & E. Olsen. Marine protected areas improve body growth of European lobster.

The consequences of size-selective fishing mortality for larval production and sustainable yield in species with obligate male care

Kindsvater H., Halvorsen K.T., Sørdalen T.K. & S. Alonzo. The consequences of size-selective fishing mortality for larval production and sustainable yield in species with obligate male care. Fish and Fisheries.

Temperate fish detection and classification: a deep learning based approach

Knausgård. K.M., Wiklund. A., Sørdalen T.K., Halvorsen K.T, Kleiven, A., Jiao, L. & A.R. Goodwin. 2020. Temperate fish detection and classification: a deep learning based approach. Applied Intelligence.