Title Oxygen mass balance in a recirculation aquaculture system for raising European Wels (Silurus glanis L.) /
Translation of Title Deguonies balansas uždaros apytakinės akvakultūros sistemos komponentuose auginant šamus (Silurus glanis L.).
Authors Mongirdas, Viktoras ; Kusta, Albinas
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Is Part of Ekologija. 2006, Nr. 4, p. 58-64.. ISSN 0235-7224
Keywords [eng] Recirculation aquaculture system ; Aeration ; Biofilter ; Oxygen mass balance
Abstract [eng] The growth of the European Wels or sheat-fish (Silurus glanis L.) was evaluated in a recirculation aquaculture system situated in a greenhouse. Recirculation aquaculture system components were evaluated in terms of oxygen use and generation. Oxygen gradients revealed the main fault of the originally constructed system elements – mechanical and biological filters. The influence of organic matter accumulation and biofilm formation in the mechanical filter was found to have a strong influence on oxygen regime. An airlift fed biological filter successfully restored oxygen depleted by the infrequent cleaning of mechanical filter media and did not need backwashing during the experiment mainly due to effective mechanical cleaning, hydraulic loading decline and subsequent heavy airlift aeration. Raceway type fish growing tanks appeared to be somewhat unpractical for use in the recirculation system due to a lack of self-cleaning effect and waste accumulation. The constants for oxygen mass balance equations taken from literature appeared to be in good correlation with the results of the experiment.
Type Journal article
Language English
Publication date 2006