Blar i Brage IMR på forfatter "Jørstad, Knut Eirik"
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A genetic marker for artificially reared cod (Gadus morhua L.)
Jørstad, Knut Eirik; Øiestad, Victor; Paulsen, Ole Ingar; Naas, Kjell Emil; Skaala, Øystein (ICES CM Documents;1987/F:22, Working paper, 1987)Artificially reared cod at the Aquaculture Station Austevoll on the west coast of Norway, were screened for genetic markers by using biopsies of white muscle, individual tags and enzyme genotype as determined by starch ... -
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 ... -
Americans on the wrong side – the lobster Homarus americanus captured in Norwegian waters
van der Meeren, Gro; Ekeli, Kees O.; Jørstad, Knut Eirik; Tveite, Stein (ICES CM documents, Working paper, 2000)In November 1999, two female lobsters, one with external egg batch, were captured in the common lobster fishery in the Oslo fjord, Norway and reported as possible American lobsters, Homarus americanus, to Bergen Aquarium ... -
Analysis of coastal cod (Gadus morhua L.) sampled on spawning sites reveals a genetic gradient throughout Norway's coastline
Dahle, Geir; Quintela, María; Johansen, Torild; Westgaard, Jon-Ivar; Besnier, Francois; Aglen, Asgeir; Jørstad, Knut Eirik; Glover, Kevin (Journal article; Peer reviewed, 2018)Atlantic cod (Gadus morhua L.) has formed the basis of many economically significant fisheries in the North Atlantic, and is one of the best studied marine fishes, but a legacy of overexploitation has depleted populations ... -
Brisling- og sildeundersøkelser i fjordene : 1. november-11. desember 1996
Torstensen, Else; Røttingen, Jostein; Jørstad, Knut Eirik (Fisken og havet, Research report, 1997)Rapporten beskriver resultatene fra akustisk kartlegging og mengdemåling av brisling og sild i utvalgte fjorder fra Svenskegrensen til Finnmark i november - desember 1996. Den totale mengden av O-gruppe brisling var mindre ... -
Coastal releases of Atlantic salmon, a new model for salmon ranching in Norway
Holm, Marianne; Jørstad, Knut Eirik; Skilbrei, Ove; Pedersen, Tom N.; Skaala, Øystein; Nortvedt, Ragnar (ICES CM Documents;1991/M:38, Working paper, 1991)The present project is launched within the frame of a 7 year government funded programme to establish an additional livelihood for the coastal regions. The aim of the study is, through controlled experiments, to find ... -
Comparative growth and survival of two genetic strains of Atlantic cod (Gadus morhua L.) reared through the early life stages in a marine pond in western Norway
Blom, Geir; Svåsand, Terje; Jørstad, Knut Eirik; Otterå, Håkon; Paulsen, Ole Ingar; Holm, Jens Christian (ICES CM Documents;1990/F:48, Working paper, 1990)The investigation was carried out in a marine pond in western Norway during spring and summer 1990. Two genetic defined strains of Atlantic cod (Gadus morhua L.) were used as broodstocks. A total of 11.1 x 10^6 cod larvae ... -
Discrimnation of herring populations in a northern Norwegian fjord: genetic and biological aspects
Jørstad, Knut Eirik; Pedersen, S.A. (ICES CM Documents;1986/H:63, Working paper, 1986)From a trawl survey in a fjord system in northern Norway, it has been possible to separate catches of herring into two distinct groups characterized by different number of vertebrae (VS). Low- vertebral herring (VS = ... -
Domestisering av marine arter
Jørstad, Knut Eirik; Otterå, Håkon; Nilsen, Frank; Norberg, Birgitta; Dahle, Geir; Karlsen, Ørjan; Skiftesvik, Anne Berit (Research report, 2002) -
Enzyme polymorphism expressed in newly hatched cod larvae and genetic analysis of larvae exposed to hydrocarbons.
Jørstad, Knut Eirik; Solberg, Tor Sverre; Tilseth, Snorre (ICES CM Documents;1980/F:22, Working paper, 1980)Cod eggs and larvae, at different stage of development, have been analyzed by starch gel electrophoresis. Four common enzymes (phosphoglucose isomerase, phosphoglucose mutase, isocitrate dehydrogenase and lactate ... -
Enzyme polymorphism of sprat from Norwegian waters - preliminary results
Jørstad, Knut Eirik; Nævdal, Gunnar (ICES CM Documents;1981/H:65, Working paper, 1981) -
Genetic analyses of cod in northern norway. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
Jørstad, Knut Eirik (Flødevigen rapportserie, Conference object, 1984)Several polymorphic proteins have been used in studies of cod stock structure in northern Norway. Samples of Arctic cod spawning in Lofoten in the spring of 1981 were analysed for enzyme polymorphism by starch gel ... -
Genetic assignment as a tool to identify the origin for Atlantic cod (Gadus morhua) escapees in Norwegian fjords
Dahle, Geir; Jørstad, Knut Eirik; Johansen, Torild; Westgaard, Jon-Ivar; Knutsen, Halvor; Glover, Kevin A. (ICES CM documents;2009/Q:14, Working paper, 2009) -
Genetic comparison of salmon (Salmo salar L.) from the White Sea and the Atlantic ocean
Skaala, Øystein; Makhrov, Alexander; Karlsen, Tove; Jørstad, Knut Eirik; Altukhov, Yuri Petrovich; Politov, Dmitri V.; Kuzishin, Kirill V.; Novikov, Georgii Gennadievich (ICES CM Documents;1996/M:13, Working paper, 1996)Samples of salmon (Salmo salar) from River Kachkovka and R. Nilma in northem Russia were analysed by starch gel electrophoresis and compared to three Norwegian stocks, R. Neiden in northern Norway and R. Øyre and R. Hop ... -
Genetic diversity within and among Atlantic cod (Gadus morhua) farmed in marine cages: a proof-of-concept study for the identification of escapees
Glover, Kevin A.; Dahle, Geir; Westgaard, Jon-Ivar; Johansen, Torild; Knutsen, Halvor; Jørstad, Knut Eirik (Journal article; Peer reviewed, 2010-03-23)This study presents a molecular genetic characterization of Atlantic cod reared in commercial marine farms. Samples consisted of approximately 47 fish collected from nine cages located on four farms throughout Norway. In ... -
Genetic impact on two wild brown trout (Salmo trutta) populations after release of non-indigenous hatchery spawners
Skaala, Øystein; Jørstad, Knut Eirik; Borgstrøm, Reidar (Journal article; Peer reviewed, 1996)A genetically marked hatchery strain of brown trout (Salmo trutta) was employed to study the genetic impact from non-indigenous hatchery fish on wild stocks. The hatchery spawners were released in autumn 1989 into the ... -
Genetic studies on eggs, larvae and 0-group of the Arctic cod stock
Jørstad, Knut Eirik (PINRO-IMR Symposium, Conference object, 1984)Genetic analyses have been performed on samples of spawning cod (March) , a large number of eggs and yalk sac 1arvae (May, postlarvae (July) and O-group cod (August-September). The distribution of eggs and larvae at ... -
Genetic studies on released and recaptured cod in a fjord system
Jørstad, Knut Eirik; Nævdal, Gunnar (ICES CM Documents;1992/G:65, Working paper, 1992)The study reported here is part of a more extensive investigation on the effects of mass rearing and release of 0-group cod in fjords and coastal areas in Norway. Each year since 1987 pond produced cod have been liberated ... -
Genetisk analyse av merket torsk (Gadus morhua)
Jørstad, Knut Eirik; Reisegg, Jon; Godø, Olav Rune (Fisken og havet, Research report, 1981)Detailed genetic analysis have provided valuable information about the population structure of several commercially important fish species. The investigations have mainly concentrated on the problem on stock identification, ... -
Genetisk merkede torskelarver gir svar på gamle stridsspørsmål
Jørstad, Knut Eirik; Kristiansen, Tore S. (Havforskningsnytt, Working paper, 1995)