An Intensive Approach to Atlantic Halibut Fry Production |
| |
| Authors: | Ivar Holmefjord Jon Gulbrandsen Ingrid Lein Terje Refstie Philippe Léger Ingvar Huse Torstein Harboe Patrick Sorgeloos Yngvar Olsen Sylvie Bolla Kjell Inge Reitan Olav Vadstein Gunvor Øie Anne Danielsberg |
| |
| Institution: | AKVAFORSK, Institute of Aquaculture Research, N-6600 Sunndalsøra, Norway;Artemia Systems SA, Oeverstraat 7, B-9200 Baasrode, Belgium;Austevoll Aquaculture Research Station, Institute of Marine Research, N-5392 Storebø, Norway;Laboratory of Aquaculture &Artemia Reference Center, University of Ghent, Rozier 44, B-9000 Ghent, Belgium;SINTEF, Center of Aquaculture, N-7034 Trondheim, Norway;SINTEF, NHL, N-7034 Trondheim, Norway |
| |
| Abstract: | The larval stage is regarded to be the main bottleneck of halibut production. Halibut eggs were obtained from captive broodstock both by stripping and by natural spawning. Artificial photoperiods were used to increase the total spawning season. Yolk sac larvae are presently produced either in small stagnant units or in large flow through systems. A major consideration is to avoid stress of the larvae, caused by mechanical disturbances of the larvae and by high bacterial load or high ammonia levels in the water.
The experiments showed that halibut larvae began to ingest algae earlier than rotifers Brachionus sp. Supplementation of algae to first feeding tanks resulted in enhanced survival and growth rate of the larvae. Both rotifers and Artemia can be enriched with very high levels of highly unsaturated n-3 fatty acids (n-3 HUFA). Enriched live feed, containing high levels of n-3 HUFA and total lipids, enhanced both survival and growth of the halibut larvae. The highest growth rates were obtained with wild zooplankton and addition of algae, but enriched cultivated feed combined with algae resulted in growth of the same magnitude as with wild zooplankton. |
| |
| Keywords: | |
|
|
