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Biological, technical, and economical feasibility of a rotifer recirculation system
Suantika, G.; Dhert, P.; Sweetman, E.; Sorgeloos, P. (2001). Biological, technical, and economical feasibility of a rotifer recirculation system, in: Hendry, C.I. et al. (Ed.) Larvi 2001: 3rd fish and shellfish larviculture symposium Gent, Belgium, September 3-6, 2001. Special Publication European Aquaculture Society, 30: pp. 577
In: Hendry, C.I. et al. (2001). Larvi 2001: 3rd fish and shellfish larviculture symposium Gent, Belgium, September 3-6, 2001. Special Publication European Aquaculture Society, 30. European Aquaculture Society: Oostende. XX1, 663 pp., meer
In: Special Publication European Aquaculture Society. European Aquaculture Society: Bredene. ISSN 0774-0689, meer

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Documenttype: Congresbijdrage

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  • Suantika, G., meer
  • Dhert, P., meer
  • Sweetman, E.
  • Sorgeloos, P., meer

Abstract
    A feasibility study was performed on the use of a recirculation system for the mass culture of rotifers at an industrial level. Rotifer culture systems were operated at three different stocking densities (3000, 5000, and 7000 individuals.ml-1) in a completely closed recirculation system. At all operating rotifer densities, a reliable production of 2.2 billion rotifers could be obtained on a daily basis during three weeks. Excellent water quality was maintained by the use of protein skimmers, ozone, and a submerged biofilter. The microbial counts remained stable during the whole culture period (106CFU.ml-1 on marine agar and 104CFU.ml-1 on TCBS after 15 days and 23 days, respectively). No difference in HUF A and protein content were obtained between rotifers harvested from the recirculation system or from a conventional batch culture system. Compared to a commercial batch culture system, the use of a recirculation system can contribute to a 30% saving on the capital investment and the annual operation cost. By using this system, capital investment cost is reduced considerably by 31 %. Savings are also made on labour (65%) and feed costs ( 10% ) during a one-year production.

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