Search Results - "Karlsen, Ø."

Impacts of salmon lice on mortality, marine migration distance and premature return in sea trout by Serra-Llinares, R. M., Bøhn, T., Karlsen, Ø., Nilsen, R., Freitas, C., Albretsen, J., Haraldstad, T., Thorstad, E. B., Elvik, K. M. S., Bjørn, P. A.

“…Brown trout Salmo trutta (L.) is a facultative anadromous species, where a portion of individuals in populations with access to the sea perform migrations to…”
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Sex-specific vertical movements of spawning atlantic cod in coastal habitats inferred from acoustic telemetry by Skjæraasen, J. E., Olsen, E. M., McQueen, K., Nyqvist, D., Meager, J. J., Karlsen, Ø, Sivle, L. D.

“…Fish spawning location and behaviour can be challenging to detect, especially in deep water. Here we utilise two large acoustic telemetry datasets from western…”
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Effects of laboratory salmon louse infection on Arctic char osmoregulation, growth and survival by Fjelldal, P.G, Hansen, T.J, Karlsen, O, Wright, D.W

“…Abstract High salmon lice (Lepeophtheirus salmonis) infestation levels resulting from intensive salmonid sea-cage aquaculture can threaten populations of wild…”
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Farmed salmonids drive the abundance, ecology and evolution of parasitic salmon lice in Norway by Dempster, T, Overton, K, Bui, S, Stien, LH, Oppedal, F, Karlsen, Ø, Coates, A, Phillips, BL, Barrett, LT

“…Sea cage fish farming is typically open to the environment, with disease transmission possible between farmed and wild hosts. In salmonid aquaculture, salmon…”
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Questionnarie-based survey of experiences with the use of expanding PIN systems in mechanical joints by Karlsen, Ø., Lemu, H.G.

“…In this paper, experiences with the use of expanding pins in mechanical joints in different equipment are investigated through a questionnaire-based survey,…”
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Inferring time at sea from scale circuli: implications for the interpretation of salmon lice distributions on sea trout by Serra-Llinares, RM, Nilsen, R, Fjeldheim, PT, Sandvik, AD, Haraldstad, T, Karlsen, Ø

“…Infestations with the ectoparasite salmon louse Lepeophtheirus salmonis are considered one of the main stressors for wild salmonids in farm-intensive areas. In…”
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Behavioural responses of wild, spawning Atlantic cod (Gadus morhua L.) to seismic airgun exposure by McQueen, K, Skjæraasen, J E, Nyqvist, D, Olsen, E M, Karlsen, Ø, Meager, J J, Kvadsheim, P H, Handegard, N O, Forland, T N, de Jong, K, Sivle, L D

“…Abstract Seismic airgun surveys to map petroleum deposits in the seabed may impact behaviour of marine animals over large distances. Understanding whether fish…”
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Inferring Atlantic salmon post-smolt migration patterns using genetic assignment by Harvey, A C, Quintela, M, Glover, K A, Karlsen, Ø, Nilsen, R, Skaala, Ø, Sægrov, H, Kålås, S, Knutar, S, Wennevik, V

“…Understanding migratory patterns is important for predicting and mitigating unwanted consequences of environmental change or anthropogenic challenges on…”
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Towards direct evidence of the effects of salmon lice (Lepeophtheirus salmonis Krøyer) on sea trout (Salmo trutta L.) in their natural habitat: proof of concept for a new combination of methods by Serra-Llinares, R. M., Freitas, C., Nilsen, R., Elvik, K. M. S., Albretsen, J., Bøhn, T., Karlsen, Ø., Bjørn, P. A.

“…Studies addressing the impact of salmon lice ( Lepeophtheirus salmonis Krøyer) on sea trout in their natural habitat are scarce and mostly limited to…”
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Sea trout adapt their migratory behaviour in response to high salmon lice concentrations by Halttunen, E, Gjelland, K‐Ø, Hamel, S, Serra‐Llinares, R‐M, Nilsen, R, Arechavala‐Lopez, P, Skarðhamar, J, Johnsen, I A, Asplin, L, Karlsen, Ø, Bjørn, P‐A, Finstad, B

“…Sea trout face growth–mortality trade‐offs when entering the sea to feed. Salmon lice epizootics resulting from aquaculture have shifted these trade‐offs, as…”
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Attraction of cod Gadus morhua from coastal spawning grounds to salmon farms by Skjæraasen, J. E., Karlsen, Ø., Langangen, Ø., Meier, S., Dunlop, K. M., van der Meeren, T., Keeley, N. B., Myksvoll, M. S., Dahle, G., Moland, E., Nilsen, R., Schrøder, K. M. Elvik, Bannister, R. J., Olsen, E. M.

“…Wild fish aggregate at aquaculture net-pens, but the underlying mechanisms are not fully understood. This study examined how salmon farms attract coastal…”
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Continuous light affects onset of puberty and associated changes in pituitary gonadotropin subunit transcript levels, and plasma estradiol-17β and testosterone levels in Atlantic cod (Gadus morhua L.) females by Karlsen, Ø., Mittelholzer, C., Andersson, E., Norberg, B., Taranger, G.L.

“…To gain more insight in photoperiod modulation of timing of puberty and its endocrine control in female Atlantic cod, ovarian development, plasma sex steroid…”
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Timecourse of oocyte development in saithe Pollachius virens by Skjæraasen, J. E., Devine, J. A., Godiksen, J. A., Fonn, M., OtterÅ, H., Kjesbu, O. S., Norberg, B., Langangen, Ø., Karlsen, Ø.

“…Wild caught North Sea saithe Pollachius virens were monitored for growth, sex steroid profiles and oocyte development pre‐spawning and measured for egg size…”
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Fertility of gynogenetic Atlantic cod (Gadus morhua L.) by Karlsen, Ø., Otterå, H., Thorsen, A.

“…Summary In order to investigate whether meiotic gynogenetic Atlantic cod is fertile and able to produce viable offspring, meiotic gynogenetic females were…”
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Element concentrations in meals from krill and amphipods, — Possible alternative protein sources in complete diets for farmed fish by Moren, M., Suontama, J., Hemre, G.-I., Karlsen, Ø., Olsen, R.E., Mundheim, H., Julshamn, K.

“…In the marine environment, organisms from lower trophic levels seem as a good alternative to the traditional meal and oil sources. In the present study, meals…”
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Impact of salmon farming on Atlantic cod spatio-temporal reproductive dynamics by Skjæraasen, JE, Karlsen, Ø, Langangen, Ø, van der Meeren, T, Keeley, NB, Myksvoll, MS, Dahle, G, Moland, E, Nilsen, R, Elvik Schrøder, KM, Bannister, RJ, Olsen, EM

“…Salmon farming in marine net pens is a major activity in many temperate regions. This industry may affect coastal ecosystems in several ways, such as with…”
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Ossification of Atlantic cod (Gadus morhua) – Developmental stages revisited by Sæle, Ø., Haugen, T., Karlsen, Ø., van der Meeren, T., Bæverfjord, G., Hamre, K., Rønnestad, I., Moren, M., Lie, K.K.

“…In studies of marine larvae, it is common to use days post-hatch as a developmental reference point. We show that age is a poor measure of morphological and…”
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The effect of dietary lipid content and stress on egg quality in farmed Atlantic cod Gadus morhua by Bogevik, A. S., Natário, S., Karlsen, Ø., Thorsen, A., Hamre, K., Rosenlund, G., Norberg, B.

“…The present study assessed differences in fecundity and egg quality from Atlantic cod Gadus morhua fed isoproteic diets containing 13% fat (low fat, LF) or 20%…”
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A gap analysis on modelling of sea lice infection pressure from salmonid farms. I. A structured knowledge review by Moriarty, M, Murphy, JM, Brooker, AJ, Waites, W, Revie, CW, Adams, TP, Lewis, M, Reinardy, HC, Phelan, JP, Coyle, JP, Rabe, B, Ives, SC, Armstrong, JD, Sandvik, AD, Asplin, LC, Karlsen, Ø, Garnier, S, á Norði, G, Gillibrand, PA, Last, KS, Murray, AG

“…Sustainability of aquaculture, an important component of the blue economy, relies in part on ensuring assessment of environmental impact and interactions…”
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Development of a risk assessment method for sea trout in coastal areas exploited for aquaculture by Finstad, B, Sandvik, AD, Ugedal, O, Vollset, KW, Karlsen, Ø, Davidsen, JG, Sægrov, H, Lennox, RJ

“…The regulation of aquaculture production in Norway considers the potential impact of salmon lice on wild fish. However, most attention has been focused on…”
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