Ørjan Karlsen

Norwegian Institute of Marine Research — Norway

Agricultural and Biological Sciences · Life Sciences

44h-index6.0kcitations181works1.22yr avg
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Research Topics

Aquaculture Nutrition and Growth(67), Fish Ecology and Management Studies(61), Marine and fisheries research(46), Reproductive biology and impacts on aquatic species(42), Parasite Biology and Host Interactions(30)

Publications181 total

Intraspecific diversity in Atlantic cod (Gadus morhua) spatial ecology within subarctic fjords during the foraging season
Marine Ecology Progress Series·2025
Salmon louse Lepeophtheirus salmonis predominates over Caligus elongatus on Atlantic salmon post-smolts in central and western Norway
Aquaculture Environment Interactions·2025Open Access
Stability and spatial scale of Atlantic cod Gadus morhua communities within a network of coastal spawning grounds
Animal Biotelemetry·2025Open Access
Salmon louse infection reduces condition and induces mortality in wild Atlantic salmon post-smolt
ICES Journal of Marine Science·2025Open Access
Comment on “Salmon Lice Biology, Environmental Factors, and Smolt Behaviour With Implications for the Norwegian Salmon Farming Management System: A Critical Review”
Reviews in Aquaculture·2025Open Access
Free-ranging Atlantic cod did not change their behaviour in response to a sparker seismic sound source
Marine Environmental Research·2025Open Access
Comment On Salmon Lice Biology, Environmental Factors, And Smolt Behaviour With Implications For The Norwegian Salmon Farming Management System: A Critical Review
SSRN Electronic Journal·2025Open Access
Physiological responses in sea trout to repeated salmon louse infections and freshwater
Conservation Physiology·2025Open Access
In situ infestation of sea trout <i>Salmo trutta</i> with salmon louse <i>Lepeophtheirus salmonis</i> reveals parasite‐induced behavioral modifications
Journal of Fish Biology·2024· 1 citedOpen Access
Sex-specific vertical movements of spawning atlantic cod in coastal habitats inferred from acoustic telemetry
Scientific Reports·2024· 1 citedOpen Access
Inferring time at sea from scale circuli: implications for the interpretation of salmon lice distributions on sea trout
Aquaculture Environment Interactions·2024Open Access
Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin
Conservation Science and Practice·2024· 8 citedOpen Access
Continuous sound from a marine vibrator causes behavioural responses of free-ranging, spawning Atlantic cod (Gadus morhua)
Environmental Pollution·2024· 5 citedOpen Access
Large females connect Atlantic cod spawning sites
Science·2023· 14 cited
A gap analysis on modelling of sea lice infection pressure from salmonid farms. II. Identifying and ranking knowledge gaps: output of an international workshop
Aquaculture Environment Interactions·2023· 4 citedOpen Access
Occurrence of salmonid alphavirus and piscine orthoreovirus‐1 infections in migrating salmon (<i>Salmo salar</i> L.) post‐smolt in western Norway
Journal of Fish Diseases·2023· 5 citedOpen Access
A gap analysis on modelling of sea lice infection pressure from salmonid farms. I. A structured knowledge review
Aquaculture Environment Interactions·2023· 4 citedOpen Access
Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes
Journal of Animal Ecology·2023· 15 citedOpen Access
Terrestrial fatty acids from feed oil in feed for farmed salmonids are transferred to the liver, gonads, and muscle of wild Atlantic cod (<i>Gadus morhua</i>)
ICES Journal of Marine Science·2023· 9 citedOpen Access
Crude oil exposure of early life stages of Atlantic haddock suggests threshold levels for developmental toxicity as low as 0.1 μg total polyaromatic hydrocarbon (TPAH)/L
Marine Pollution Bulletin·2023· 14 citedOpen Access
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Frequent Co-authors

Birgitta Norberg(8), Grethe Rosenlund(8), Geir Lasse Taranger(7), Rolf Erik Olsen(7), G.-I. HEMRE(7), Sonnich Meier(6), Gro‐Ingunn Hemre(5), Elin Sørhus(5), Anders Mangor‐Jensen(5), Ann‐Cecilie Hansen(4), Olav Sigurd Kjesbu(4), Terje van der Meeren(4), Anders Thorsen(4), Finn‐Arne Weltzien(3), Bengt Finstad(3), Trond Nordtug(3), Rolf B. Edvardsen(3), Kristoffer Tveit(3), Ingrid Askeland Johnsen(3), Einar Ringø(3)