Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Hansen, Tom"
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Artificial hatching substrate and different time of transfer to startfeeding: Effect on growth and protease activities of the Atlantic salmon (Salmo salar).
Hansen, Tom; Torrissen, Krisna Rungruangsak (ICES CM Documents;1984/F:22, Working paper, 1984)Groups of Atlantic salmon (Salmo salar) eggs were hatched in a Californian hatching system with and without an astro-turf artificial substrate, and food was presented at four different points in development. Dry weight ... -
Artificial hatching substrate in the mass rearing of larval Atlantic salmon (Salmo salar)
Hansen, Tom; Torrissen, Ole (ICES CM Documents;1984/F:30, Working paper, 1984)Eggs from individual Atlantic salmon (Salmo salar) were hatched in a Californian hatching system with and without an astro-turf artificial substrate and growth during the first 200 days following hatching was ... -
Artificial hatching substrate, effect on RNA / DNA ratio and protein retention during the yolk-sac period of Atlantic salmon (Salmo salar)
Taranger, Geir Lasse; Hansen, Tom; Torrissen, Ole; Raae, Arnt J. (ICES CM Documents;1985/F:31, Working paper, 1985)Genetical groups of Atlantic salmon (Salmo salar) were hatched in a Caiifonian hatching system with and without an astro-turf artificial hatching substrate, and were later transfered to separate feeding units. The ... -
Causes of variation in carcass traits of Atlantic salmon (Salmo salar)
Torrissen, Ole; Hansen, Tom; Torrissen, Krisna Rungruangsak; Nævdal, Gunnar (ICES CM Documents;1984/F:25, Working paper, 1984)The aim of the present study was to reveal causes of variation in carcass traits of farmed Atlantic salmon (Salmo salar). During slaughtering of one year class Atlantic salmon, composed of half sib and full sib groups, ... -
Effects of different rearing environments on the mortality of Atlantic salmon broodstock and eggs
Ulgenes, Yngve; Torrissen, Ole; Hansen, Tom (ICES CM Documents;1984/F:26, Working paper, 1984)Atlantic salmon (Salmo salar) reared for three years in seawater were moved to brackish- and freshwater before they matured. A control group matured in seawater. The groups were given different feeding regimes the last ... -
Hatching of Atlantic salmon (Salmo salar) in an artificial substrate
Hansen, Tom; Møller, Dag (ICES CM Documents;1982/F:35, Working paper, 1982) -
pH adjustment of acid water at Matre Aquaculture Station: Experiences with previous and existing methods
Ulgenes, Yngve; Hansen, Tom; Torrissen, Ole (ICES CM Documents;1984/F:28, Working paper, 1984)The water from Matre River is characterized as very soft, with a total hardness of 1. 5 - 2. 5 mg Ca0/1 and a very low buffer capacity. Acid precipitation results in low pH, values below 5. 0 are recorded every year. ... -
Seawater adaptability of two strains of arctic char (Salvelinus alpinus) reared under different light regimes
Stefansson, Sigurd O.; Hansen, Tom; Holm, Jens Christian (ICES CM Documents;1987/F:37, Working paper, 1987)Groups of Arctic char (Salvelinus alpinus) were reared under three experimental light regimes. Two different strains of char were used, one non-migratory from south Norway, the other anadromous from northern Norway. All ... -
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 ... -
Start feeding of salmonids with lake zooplankton
Holm, Jens Christian; Hansen, Tom; Møller, Dag (ICES CM Documents;1982/F:36, Working paper, 1982)Fry and small fingerlings of Atlantic salmon (Salmo salar) and rainbow trout (Salmo gairdneri) were fed with lake zooplankton in small fine-meshed cages. The zooplankton were pumped into cages. Growth rates and food selection ... -
The effect of different photoperiods on growth and smoltification in Atlantic salmon (Salmo salar)
Stefansson, Sigurd O.; Hansen, Tom; Nævdal, Gunnar; Torrissen, Ole (ICES CM Documents;1985/F:32, Working paper, 1985)Photoperiod has been implicated as an effective mediator of growth and smelting in Atlantic salmon (Salmo salar). To investigate this 0+ parr of Atlantic salmon were treated with three different photoperiods: 24Light:0Dark; ... -
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 transfer of Atlantic salmon (Salmo salar) with constricted yolk sacs to an artificial hatching substrate
Hansen, Tom (ICES CM Documents;1985/F:25, Working paper, 1985)Atlantic salmon larvae were transferred from a flat screened hatching tray to an artificial hatching substrate when all larvae had developed yolk sac constrictions. The transfer increased the growth rate and the yolk ...