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Development of a controlled intensive aquaculture system
Avnimelech, Y.; Diab, S.; Kochva, M.; Mokady, S. (1992). Development of a controlled intensive aquaculture system, in: Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17: pp. 21-37
In: (1992). Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17. European Aquaculture Society: Oostende. ISBN 90-71625-11-7. 360 pp., more
In: Spec. Publ. Eur. Aquacult. Soc, more

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Keyword
    Marine

Authors  Top 
  • Avnimelech, Y.
  • Diab, S.
  • Kochva, M.
  • Mokady, S.

Abstract
    Aeration, mixing and avoiding the creation of anaerobic sites in the pond, enables the growth of dense cultures of fish using a minimal water exchange rate (ca 20% a day). Inorganic nitrogen may accumulate under these conditions up to toxic levels. One solution is to accelerate the nitrification process so as to avoid the build-up of ammonium and nitrite ions. The solution demonstrated in this work is to control inorganic nitrogen levels through the induction of microbial protein synthesis. This is done by adding a carbonaceous substrate, adjusted in such a way as to consume all the non-utilized nitrogen. Inorganic nitrogen levels were reduced and organic, protein nitrogen produced as a result of such additions. The in situ produced microbial protein is a substitute to protein added with the feed. Fish growth in the treated ponds was higher than the growth in conventionally fed ponds. The price of feed was reduced to 50-70% of that common in conventional ponds, both due to the replacement of protein and to limited washout of feed.

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