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Growth and survival studies of halibut (Hippoglossus hippoglossus L.) from hatching to beyond methamorphosis carried out in mesocosm
Øiestad, V.; Berg, L. (1989). Growth and survival studies of halibut (Hippoglossus hippoglossus L.) from hatching to beyond methamorphosis carried out in mesocosm, in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 233-240
In: De Pauw, N. et al. (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene. ISBN 90-71625-03-6. 1-592 pp., meer
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Documenttype: Congresbijdrage
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    Marien/Kust
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  • Øiestad, V.
  • Berg, L.
Abstract
    One day after hatching 1 500 halibut larvae were transferred from the hatchery to each of live floating plastic bags. The plastic bags had a volume of 11.5m³ and a total depth of 4.5m. They were moored to floating collars. The bags were made of black polyethylene and each bag was covered with a roof so the larvae were in a totally dark water column the first month. The overall salinity was that of Atlantic water. Supplied water had a salinity of 30-32°/oo. The halibut larvae reached the functional stage 40 days after hatching, and then natural zooplankton was added. At this time an opening was gradually made in the roof of three of the bags while light was supplied by lamps submerged in the remaining two bags. Survival to the first feeding stage was about 45%. Almost all examined larvae had started to feed. The larvae reached a mean size of 20mm at termination of the bag experiment 45 days after the first feeding was observed. The mean dry weight had then increased on day 90 from 750 to 10 000ug in the active feeding period. Mean overall survival was 3%. The larvae had not completed their metamorphosis when the bag experiment was ended.
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