Blar i Brage IMR på forfatter "Nortvedt, Ragnar"
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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 ... -
Smoltification of Atlantic salmon in different water qualities and subsequent growth in sea water, following distinct transfer strategies from freshwater
Nortvedt, Ragnar; Hansen, Tom; Lunde, Trygve; Skybakmoen, Steinar (ICES CM Documents;1990/F:64, Working paper, 1990)Atlantic salmon parr were kept in four different fresh water qualities for seven months before smoltification, which was characterized by plasma chloride content after sea water challenge tests. Three groups were transferred ... -
The activity of alevins of Atlantic salmon and rainbow trout, incubated on different substrates
Nortvedt, Ragnar (ICES CM Documents;1986/F:24, Working paper, 1986)Atlantic salmon (Salmo salar) and rainbow trout (S. gairdneri) eggs were incubated in plexi-glass aquariums. After hatching, alevins were kept in darkness, two groups of each species without substrate, two groups in ... -
The effect of a short time exposure to different temperature and salinity regimes on survival of maturing Atlantic salmon and eyed eggs, and changes in blood and seminal plasma during the spawning period
Albrektsen, Sissel; Nortvedt, Ragnar; Torrissen, Ole (ICES CM Documents;1986/F:25, Working paper, 1986)Maturing Atlantic salmon, transferred from brackish water two weeks prespawning, were held under four different temperature and salinity regimes through their spawning period. Values of blood glucose and haematocrit ... -
The effect of illumination on alevins of Atlantic salmon (Salmo salar) and rainbow trout (S. gairdneri), incubated on different substrates
Nortvedt, Ragnar; Hansen, Tom; Holm, Marianne; Torrissen, Ole (ICES CM Documents;1985/F:27, Working paper, 1985)Atlantic salmon (Salmo salar) and rainbow trout (S. gairdneri) eggs were incubated in plexi-glass aquariums. After hatching, alevins were kept in darkness, two groups of each species without substrate, two groups in ... -
The timing of emergence of Atlantic salmon and rainbow trout, incubated on different substrates
Nortvedt, Ragnar (ICES CM Documents;1986/F:26, Working paper, 1986)Atlantic salmon (Salmo salar) and rainbow trout (S. gairdneri) eggs were incubated in plexi-glass aquariums. After hatching, alevins were kept in darkness, two groups of each species without substrate, two groups in ... -
Vitaminmangel kan gi dårlig eggkvalitet hos kveite
Nortvedt, Ragnar; Mangor-Jensen, Anders (Havforskningsnytt, Working paper, 2001)