Browsing Brage IMR by Author "Rabben, Håvard"
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A comparison of growth rate of halibut larvae (Hippoglossus hippoglossus L.) fed wild zooplankton and enriched Artemia
Skjolddal, Lillian; Harboe, Torstein; Næss, Tore Håkon; Naas, Kjell Emil; Rabben, Håvard (ICES CM Documents;1990/F:60, Working paper, 1990)Halibut larvae at an age of 267 day degrees post hatching, were reared through first feeding, outdoors in 100 l plastic bags. There were three feeding regimes: wild zooplankton, Artemia enriched on the algae Isochrysis ... -
A stripping method for Atlantic halibut (Hippoglossus hippoglossus L.)
Rabben, Håvard (ICES CM Documents;1987/F:40, Working paper, 1987)A stripping-board was built and tested on a broodstock of halibut ranging from 8 to 150 kg body weight. The smooth surface of the neophrene mattress minimized the loss of mucus and reduced the stripping stress ... -
Age of Atlantic halibut larvae (Hippoglossus hippoglossus L.) at first feeding
Harboe, Torstein; Næss, Tore Håkon; Naas, Kjell Emil; Rabben, Håvard; Skjolddal, Lillian (ICES CM Documents;1990/F:53, Working paper, 1990)Halibut larvae at different age (150 to 315 day-degrees) were transferred to outdoor startfeeding tanks each with two internal plastic bags (100 litre). The larvae were fed wild zooplankton. One bag was sampled after 24 ... -
Green water in larviculture - An experiment with natural phytoplankton in tanks for first feeding of halibut larvae (Hippoglossus hippoglossus L.)
Næss, Tore Håkon; Bergh, Øivind; Harboe, Torstein; Naas, Kjell Emil; Rabben, Håvard; Skjolddal, Lillian (ICES CM Documents;1990/F:61, Working paper, 1990)At 232 day degrees, halibut larvae were transferred from indoor tanks to 1.7 m^3 outdoor tanks for first feeding. The number in each tank was approximately 750. Three tanks were continuously given algal suspension ("green ... -
Growth of juvenile halibut (Hippoglossus hippoglossus L.) in captivity
Rabben, Håvard; Huse, Ingvar (ICES CM Documents;1986/F:20, Working paper, 1986)The growth and substrate preference of collected wild juvenile halibut under culture conditions were investigated. The size of the collected fish conformed well with year class data from earlier studies. Halibut growth ... -
Hatching of halibut (Hippoglossus hippoglossus L.) eggs under different light conditions
Rabben, Håvard; Jelmert, Anders (ICES CM Documents;1986/F:17, Working paper, 1986)Halibut eggs were hatched in total darkness and in illumination (60 lux light). A simoultanous hatching to a final hatching of 99%, and positive buoyant larvae in the dark hatching jars were experienced. In the illuminated ... -
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 ... -
Production experiment of halibut fry (Hippoglossus hippoglossus) in silos
Rabben, Håvard; Jelmert, Anders; Huse, Ingvar (ICES CM Documents;1987/F:42, Working paper, 1987)Silos with conical bottoms and a volume of approx 3.5 m3 are tested as storing units for halibut yolk-sac larvae. The silos were run in three different ways: A: Stagnant water with a saltplug till day 10 and later slow ... -
Production experiment of halibut fry in large enclosed water columns
Rabben, Håvard; Nilsen, T.O.; Huse, Ingvar; Jelmert, Anders (ICES CM Documents;1986/F:19, Working paper, 1986)Halibut eggs were hatched in 21 floating enclosures and the larvae stored through the yolk sac period under 5 different environmental conditions, each with 4 parallels. The effect of the different environments was ... -
Upwelling incubators for eggs of the Atlantic halibut (Hippoglossus hippoglossus L.)
Jelmert, Anders; Rabben, Håvard (ICES CM Documents;1987/F:20, Working paper, 1987)Incubators with upwelling water for eggs of the Atlantic Halibut are described. Tending and fate of the eggs where monitored, with special emphasis on egg mortality and bacterial activity. Bacterial activity in ...