Search Results - "Skjæraasen, JE"

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…”
Get full text

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…”
Get full text

Sub-populations of coastal cod with different behaviour and life-history strategies by Salvanes, Anne Gro Vea, Skjæraasen, Jon Egil, Nilsen, Trygve

“…This study provides evidence of countergradient variations in life-history traits among coastal codGadus morhuaoff the Norwegian coast, suggesting the…”
Get full text

Mating competition between farmed and wild cod Gadus morhua by Skjæraasen, JE, Meager, JJ, Karlsen, Ø, Mayer, I, Dahle, G, Rudolfsen, G, Fernö, A

“…Increasing numbers of hatchery-produced fish entering marine environments has caused concern over potential fitness depressions in wild populations, yet no…”
Get full text

Morphological and behavioural correlates of reproductive success in Atlantic cod Gadus morhua by Rowe, S, Hutchings, JA, Skjæraasen, JE, Bezanson, L

“…We tested the hypothesis that reproductive success is randomly distributed within spawning aggregations of Atlantic cod Gadus morhua, a broadcast-spawning…”
Get full text

Skipped spawning in Northeast Arctic haddock Melanogrammus aeglefinus by Skjæraasen, J. E., Korsbrekke, K., Nilsen, T., Fonn, M., Kjesbu, O. S., Dingsør, G. E., Nash, R. D. M.

“…Large interannual fluctuations in the numbers of offspring joining a teleost population are common, yet factors affecting offspring production, a key driver of…”
Get full text

Sperm characteristics and competitive ability in farmed and wild cod by Skjæraasen, Jon E., Mayer, Ian, Meager, Justin J., Rudolfsen, Geir, Karlsen, Ørjan, Haugland, Thomas, Kleven, Oddmund

“…The development of cod aquaculture has raised concerns about its effect on wild stocks. One risk is hybridisation between escapees and wild cod, causing…”
Get full text

The Effect of Photoperiod on Sexual Maturation, Appetite and Growth in Wild Atlantic Cod (Gadus morhua L.) by Skjæraasen, J.E., Salvanes, A.G.V., Karlsen, Ø., Dahle, R., Nilsen, T., Norberg, B.

“…An experiment was conducted to examine (a) the effects of photoperiod on timing of sexual maturation (b) the relationship between plasma steroid levels,…”
Get full text

Vertical dynamics and reproductive behaviour of farmed and wild Atlantic cod Gadus morhua by Meager, JJ, Skjæraasen, JE, Fernö, A, Karlsen, Ø, Løkkeborg, S, Michalsen, K, Utskot, SO

“…Rapid development of fish mariculture and efforts to restock depleted populations have raised concerns about the effects on wild populations and the risk of…”
Get full text

Liver energy, atresia and oocyte stage influence fecundity regulation in Northeast Arctic cod by Skjæraasen, Jon Egil, Nash, Richard D. M., Kennedy, James, Thorsen, Anders, Nilsen, Trygve, Kjesbu, Olav Sigurd

“…Marine ecosystems are changing; global warming-induced increases in water temperatures and fishing have caused truncated age structures and small sizes at…”
Get full text

Size-, energy- and stage-dependent fecundity and the occurrence of atresia in the Northeast Arctic haddock Melanogrammus aeglefinus by Skjæraasen, Jon Egil, Korsbrekke, Knut, Kjesbu, Olav Sigurd, Fonn, Merete, Nilsen, Trygve, Nash, Richard D.M.

“…The Northeast Arctic (NEA) haddock (Melanogrammus aeglefinus) population size has fluctuated greatly over the last few decades. Such fluctuations may be…”
Get full text

Triploidy alters brain morphology in pre-smolt Atlantic salmon Salmo salar: possible implications for behaviour by Fraser, T. W. K., Fjelldal, P. G., Skjæraasen, J. E., Hansen, T., Mayer, I.

“…Total brain mass and the volumes of five specific brain regions in diploid and triploid Atlantic salmon Salmo salar pre‐smolts were measured using digital…”
Get full text

effect of triploidy on the efficacy and physiological response to anesthesia with MS 222 and isoeugenol in Atlantic salmon post-smolts by Fraser, T. W. K, Mayer, I, Skjæraasen, J. E, Hansen, T, Fjelldal, P. G

“…Sterile triploid fish are increasingly being used in salmon aquaculture and fisheries. For production, welfare, and experimental reasons, it is important to…”
Get full text

Behavioural responses of hatchery-reared and wild cod Gadus morhua to mechano-acoustic predator signals by Meager, J. J., Rodewald, P., Domenici, P., Fernö, A., Järvi, T., Skjæraasen, J. E., Sverdrup, G. K.

“…The behavioural responses of wild (predator‐experienced) and hatchery‐reared (predator‐naive) cod Gadus morhua to standardized mechano‐acoustic (MA) stimuli…”
Get full text

Hypoxic avoidance behaviour in cod ( Gadus morhua L.): The effect of temperature and haemoglobin genotype by Skjæraasen, J.E., Nilsen, T., Meager, J.J., Herbert, N.A., Moberg, O., Tronci, V., Johansen, T., Salvanes, A.G.V.

“…Hypoxia can influence fish growth, survival and on larger scales, population structure. These effects may be influenced by water temperature, and may vary…”
Get full text

Distribution and feeding ecology of Raja radiata in the northeastern North Sea and Skagerrak (Norwegian Deep) by Skjæraasen, J. E., Bergstad, O. A.

“…The distribution and feeding ecology of Raja radiata in the deeper parts of the northeastern North Sea and Skagerrak (i.e. the Norwegian Deep) are described…”
Get full text

Recovery from handling stress in Gadus morhua by Artigas, M. L., Skjæraasen, J. E., Utne-Palm, A. C., Nilsen, T.

“…The time needed for juvenile cod Gadus morhua to recover from handling stress, and also whether observer presence or haemoglobin genotype influenced recovery…”
Get full text

The isolation of Atlantic cod, Gadus morhua (Gadiformes), populations in Northern Meromictic lakes—A recurrent arctic phenomenon by Hardie, D. C., Renaud, C. B., Ponomarenko, V. P., Mukhina, N. V., Yaragina, N. A., Skjæraasen, J. E., Hutchings, J. A.

“…Although it has previously been considered to be a rare phenomenon, this paper provides evidence of eight occurrences of Atlantic cod in northern coastal…”
Get full text

Countergradient variation in behaviour, growth and lipid storage in Atlantic cod; environmental and genetic effects by Salvanes, A. G. V., Skjæraasen, J. E., Nilsen, T.

“…We housed offspring from northern (70° N) and southern (60° N) coastal cod (Gadus morhua) together in a ‘common garden’ rearing experiment at a temperature and…”
Get full text

Notes on the distribution and length composition of Raja lintea, R. fyllae, R. hyperborea and Bathyraja spinicauda (Pisces: Rajidae) in the deep northeastern North Sea and on the slope of the eastern Norwegian Sea by Skjæraasen, J. E., Bergstad, O. A.

“…The distribution and length composition of four skate species inhabiting deep shelf and upper slope waters of the Northeastern Atlantic are compared. Raja…”
Get full text