Browsing Brage IMR by Author "Fernö, Anders"
Now showing items 1-20 of 44
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A method of observing the spawning behaviour of farmed and wild salmonids in a natural stream habitat
Skaala, Øystein; Jørstad, Knut Eirik; Fernö, Anders (ICES CM Documents;1993/M:21, Working paper, 1993)When farmed fish escape from farms, they may compete with wild individuals for a number of resources, such as food, spawning sites, and mates. As a part of a larger study on genetic impact from farmed fish on wild ... -
A multiple approach to behaviour studies of salmon reared in marine net pens
Fernö, Anders; Furevik, Dag M.; Huse, Ingvar; Bjordal, Åsmund (ICES CM Documents;1988/F:15, Working paper, 1988)The behaviour of Atlantic salmon in culture was lnvestigated by various techniques with the ultimate goal of characterlzing the behaviour typical for a situation with rapid growth. Differences in behaviour between and ... -
Aggression and growth of atlantic salmon in different stocking densities
Fernö, Anders; Holm, Marianne; Roald, Sverre Ola (ICES CM Documents;1976/E:37, Working paper, 1976) -
Aggression and growth of Atlantic salmon parr. I. Different stocking densities and size groups
Fernö, Anders (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)The aggressive behaviour and growth of salmon parr under crowded rearing conditions was studied at four different densities. One or several fish per aquarium was dominant, displaying a kind of territorial defence and ... -
Aggression and growth of Atlantic salmon parr. II. Different populations in pure and mixed groups
Holm, Marianne; Fernö, Anders (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)The aggressive behaviour and growth of different populations of Atlantic salmon parr and the possible effect of fin-clipping on these traits were studied. Each of three 2001 aquaria was stocked with 90 unmarked hatchery ... -
Aggression and growth of different populations of Atlantic salmon parr
Holm, Marianne; Fernö, Anders (ICES CM Documents;1978/M:24, Working paper, 1978)In order to study aggression and growth of salmon parr of different populations and the possible effect of fin-clipping on these traits hatchery reared parr originating from three populations (2 Norwegian, 1 Swedish) were ... -
Await in the pelagic: herring compromising reproduction and survival within a vertically split school
Axelsen, Bjørn Erik; Misund, Ole Arve; Fernö, Anders; Nøttestad, Leif; Johannessen, Arne (ICES CM documents, Working paper, 1998) -
‘Await’ in the pelagic: dynamic trade-off between reproduction and survival within a herring school splitting vertically during spawning
Axelsen, Bjørn Erik; Nøttestad, Leif; Fernö, Anders; Johannessen, Arne; Misund, Ole Arve (Journal article; Peer reviewed, 2000-10-19)Spatio-temporal aspects of spawning behaviour were investigated in a single school of Norwegian spring-spawning herring Clupea harengus, and are explained by changes in the relative importance of reproduction, predation ... -
The behaviour of whiting (Gadus merlangus) in relation to long lines
Fernö, Anders; Tilseth, Snorre; Solemdal, Per (ICES CM Documents;1977/B:44, Working paper, 1977) -
Behaviour studies on fish reaction to long lines
Tilseth, Snorre; Solemdal, Per; Fernö, Anders (ICES CM Documents;1978/B:22, Working paper, 1978)This study is a continuation of a field investigation on the behaviour of fish towards long lines, started in 1976. The present paper gives an analysis of the effect of current and time of the day on the activity of whiting ... -
Distribution and behavioural dynamics of ocean feeding Norwegian spring spawning herring: observations across spatio-temporal scales
Misund, Ole Arve; Nøttestad, Leif; Mackinson, Steven; Guenette, Sylvie; Pitcher, Tony; Fernö, Anders (ICES CM documents, Working paper, 1998) -
Effects on salmon (Salmo salar) from different operational procedures in fish farming
Bjordal, Åsmund; Fernö, Anders; Furevik, Dag M.; Huse, Ingvar (ICES CM Documents;1988/F:16, Working paper, 1988)The effects on farmed salmon caused by operational procedures as handling, de-lousing, removal of dead fish, grading and transfer were studied by underwater TV-observations, ultrasonic telemetry of heart rate and analyses ... -
Environmental regulation of individual depth on a cod spawning ground
Meager, Justin J.; Skjæraasen, Jon Egil; Karlsen, Ørjan; Løkkeborg, Svein; Mayer, Ian; Michalsen, Kathrine; Nilsen, Trygve; Fernö, Anders (Journal article; Peer reviewed, 2012-12-13)Fine-scale characteristics of spawning grounds may provide the opportunity for cod Gadus morhua L. to regulate their external environment by adjusting their depth. Ultrasonic telemetry was used to study how the environment ... -
Establishment of new wintering areas in herring co-occur with peaks in recruit to spawner ratio
Huse, Geir; Fernö, Anders; Holst, Jens Christian (ICES CM documents;2009/H:11, Working paper, 2009)During late summer, Norwegian spring-spawning herring migrate to wintering areas, where they remain for about five months in dense aggregations. First-time spawning cohorts typically adopt the overwintering area of the ... -
Establishment of new wintering areas in herring co-occurs with peaks in the ‘first time/repeat spawner’ ratio
Huse, Geir; Fernö, Anders; Holst, Jens Christian (Journal article; Peer reviewed, 2010-06-23)Norwegian spring spawning (NSS) herring migrate to wintering areas in late summer and remain there for about 5 mo in dense aggregations. First-time spawning cohorts typically adopt the wintering area of the spawning stock. ... -
Factors affecting the distribution of wrasses in a fjord system: analysis by generalised linear models
Thangstad, Trond; Fosså, Jan Helge; Fernö, Anders; Johannessen, Arne (ICES CM Documents;2000/N:31, Working paper, 2000)Background: Generalised linear models (GLMs, see McCullagh & Nelder 1989) form a modern, flexible and unified approach to statistical modelling. GLMs are of particular value to the analysis of data from ecological surveys, ... -
Feeding ecology of Atlantic mackerel (Scomber scombrus) in the Norwegian Sea
Langøy, Herdis; Nøttestad, Leif; Skaret, Georg; Broms, Cecilie; Fernö, Anders (ICES CM documents, Working paper, 2006)Previous studies on Atlantic mackerel (Scomber scombrus) feeding during the highly migratory summer period are scarce. In this study we present detailed diet analyses and investigations of prey selection for Atlantic ... -
Field studies on the behaviour of whiting (Gadus merlangus L.) towards baited hooks
Fernö, Anders; Solemdal, Per; Tilseth, Snorre (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)The responses of whiting to a test line with baited hooks were studied during three cruises in the Trondheimsfjord area in three seasons. The activity of the fish directed towards the baited hooks increased at sunrise ... -
Fish behaviour in relation to long lines observed by TV
Fernö, Anders; Johannessen, Arne; Olsen, Kjell; Solemdal, Per; Tilseth, Snorre; Valdemarsen, John Willy (ICES CM Documents;1976/B:38, Working paper, 1976) -
Habituation and conditioning in gilthead sea bream (Sparus aurata): Effects of aversive stimuli, reward and social hierarchies
Folkedal, Ole; Fernö, Anders; Nederlof, Marit A. J.; Fosseidengen, Jan Erik; Cerqueira, Marco; Olsen, Rolf Erik; Jonatan, Nilsson (Peer reviewed; Journal article, 2017)