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Eel farming in an indoor recirculated system: technical, biological, and economical aspects
Jespersen, T. (1989). Eel farming in an indoor recirculated system: technical, biological, and economical aspects, in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 185-196
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., more
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Document type: Conference paper
Keyword
    Marine/Coastal
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  • Jespersen, T.
Abstract
    A recirculating system has been developed at the Danish Aquaculture Institute since 1981. The system now consists of 10 circular fish tanks (total area 92m²), a swirl concentrator, a reservoir, and four biological submerged upflow filters. The total volume of the system is 100m³. Pure oxygen is added to fulfill the oxygen requirements. Water renewal corresponds to 200 l.kg-1 feed.d-1. The temperature is 25°C. Results from periods without disturbance (e.g. reconstruction of units) show a mean specific growth rate for the whole eel population stocked in the tanks of 0.96%.d-1 varying trom 1.49%.d-1 for eels from 2 to 59, to 0.52%.d-1 for eels exceeding 200g. The feeding level varied from 1.92%.d-1 to 0.96%.d-1.k-1 of eels in the same size groups; the mean feed conversion was 1.47. A mean stocking density of 80-90kg.m-2 tank area is feasible in recirculating systems corresponding to a production of 250-300kg of eels.m-2 tank area.yr-1. The running costs (excluding interest and depreciation of the invested capital and labour costs) are about Dkr 30 to produce 1 kg eel in a fully loaded system.
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