Browsing Brage IMR by Author "Fosseidengen, Jan Erik"
Now showing items 1-17 of 17
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Akustisk mengdemåling av oppdrettslaks
Juell, Jon-Erik; Fosseidengen, Jan Erik (Fisken og havet, Research report, 1995)Continuous monitoring of the biomass in salmon cages is likely to increase the production efficiency. It would optimize density-dependent farm procedures, e.g food and drug administration, and provide a possibility for ... -
Consistent melanophore spot patterns allow long-term individual recognition of Atlantic salmon Salmo salar
Stien, Lars Helge; Nilsson, Jonatan; Bui, Samantha; Fosseidengen, Jan Erik; Kristiansen, Tore S; Øverli, Øyvind; Folkedal, Ole (Peer reviewed; Journal article, 2017) -
Experiments on tagging mortality and shedding in captive Norwegian spring spawning herring: effects of tagging season and tag type
Slotte, Aril; Schweigert, Jake; Flostrand, Linnea; Fosseidengen, Jan Erik (ICES CM documents, Working paper, 2001) -
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) -
Halibut behaviour as a means of assessing suitability of ongrowth systems
Holm, Jens Christian; Tuene, Stig; Fosseidengen, Jan Erik (ICES CM Documents;1998/L:4, Working paper, 1998)Halibut behaviour in net pens has been studied using direct observation, underwater video and/or hydroacoustic equipment. Rearing experience includes a wide range of fish weights (50-10.000 g) and fish densities (4-150 ... -
Hvordan unngå flytere ved heving av torskemerder
Korsøen, Øyvind Johan; Fosseidengen, Jan Erik; Dempster, Tim; Stien, Lars Helge; Kristiansen, Tore S. (Havforskningsnytt;Nr. 2 - 2011, Working paper, 2011)Oppdrettstorsk tåler en trykkreduksjon på maks 40 % dersom en skal være sikker på at svømmeblæren ikke løfter fisken til overflaten med buken i været. Etter en slik reduksjon av trykket bør det gå minst åtte timer før ... -
Hydroakustisk overvåkning og styring av lakseproduksjon
Juell, Jon-Erik; Lindem, Torfinn; Fosseidengen, Jan Erik; Houari, Driss Al; Bjordal, Åsmund (Fisken og havet, Research report, 1995)Efficient and "clean" cage-rearing of Atlantic salmon requires good monitoring- and controlroutines. Fullscale tests of a the combined monitoring and feeding system "CageEye", indicated that active use of the system will ... -
Learning and anticipatory behaviour in a “sit-and-wait” predator: the Atlantic halibut
Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik; Stien, Lars Helge; Fernö, Anders; van den Bos, Ruud (Journal article; Peer reviewed, 2010-03)We studied the learning capacities and anticipatory behaviour in a “sit-and-wait” predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes ... -
Learning and anticipatory behaviour in a “sit-and-wait” predator: the Atlantic halibut
Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik; Stien, Lars Helge; Fernö, Anders; van den Bos, Ruud (Journal article; Peer reviewed, 2010-03)We studied the learning capacities and anticipatory behaviour in a “sit-and-wait” predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes ... -
Merd-miljø og fiskevelferd i lakseproduksjon på kyst- og fjordlokaliteter på Vestlandet
Johansson, David; Juell, Jon-Erik; Oppedal, Frode; Stiansen, Jan Erik; Fosseidengen, Jan Erik (Fisken og havet, Research report, 2004)This survey give detailed information about the complex variation of the physical, biological and chemical variation in environment at typical fjord and coastal farming sites in the autumn. Large variations with depth and ... -
Migratory patterns of escaped farmraised Atlantic salmon
Furevik, Dag M.; Rabben, Håvard; Mikkelsen, Kent Olav; Fosseidengen, Jan Erik (ICES CM Documents;1990/F:55, Working paper, 1990)Simulated escapes of farmed salmon from netpens are done. Migratory behaviour and routes are studied by combining acoustic tagging and standard tagging - release methodology. A prototype of a recapture trap has been ... -
'Snorkel' sea lice barrier technology reduces sea lice loads on harvest-sized Atlantic salmon with minimal welfare impacts
Stien, Lars Helge; Dempster, Timothy David; Bui, Samantha; Glaropoulos, Alexis; Fosseidengen, Jan Erik; Wright, Daniel W.; Oppedal, Frode (Journal article; Peer reviewed, 2016-02-13)The infestation of farmed Atlantic salmon (Salmo salar) by ectoparasitic sea lice (Lepeophtheirus salmonis) presents a need for new approaches to parasite control. One option is the use of ‘snorkel’ sea lice barrier ... -
The interaction between water currents and salmon swimming behaviour in sea cages
Johansson, David; Laursen, Frida; Fernö, Anders; Fosseidengen, Jan Erik; Klebert, Pascal; Stien, Lars Helge; Vagseth, Tone; Oppedal, Frode (Journal article; Peer reviewed, 2014-05-15)Positioning of sea cages at sites with high water current velocities expose the fish to a largely unknown environmental challenge. In this study we observed the swimming behaviour of Atlantic salmon (Salmo salar L.) at a ... -
Torsken er et skolelys!
Nilsson, Jonatan; Kristiansen, Tore S.; Fosseidengen, Jan Erik (Havforskningsnytt, Working paper, 2005) -
Torskeoppdrett i nedsenkede merder?
Korsøen, Øyvind Johan; Fosseidengen, Jan Erik; Dempster, Tim; Kristiansen, Tore S. (Journal article, 2011-05)På grunn av torskens forkjærlighet for lavere sommertemperaturer og høyere vintertemperaturer enn det man ofte finner i de øverste lagene i vannsøylen, har både kommersielle aktører og forskere forsøkt med oppdrett av ... -
Towards cod without spawning: artificial continuous light in submerged sea-cages maintains growth and delays sexual maturation for farmed Atlantic cod Gadus morhua
Korsøen, Øyvind Johan; Dempster, Tim; Fosseidengen, Jan Erik; Karlsen, Ørjan; Oppedal, Frode; Stien, Lars Helge; Kristiansen, Tore S. (Journal article; Peer reviewed, 2013-06-04)Sexual maturation and spawning in sea-cages is a major production and environmental challenge for the Atlantic cod farming industry. Altered photoperiod has arrested sexual maturation in cod kept in indoor or covered ... -
Varmebehandling av laks i forbindelse med avlusing
Mangor-Jensen, Anders; Stien, Lars Helge; Fosseidengen, Jan Erik; Mangor-Jensen, Ragnfrid (Rapport fra Havforskningen;7-2017, Working paper, 2017)