COMPARATIVE PERFORMANCE OF SUBMERGED AND TRICKLING BIOFILTER IN RECIRCULATING AQUACULTURE SYESTEM
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Authors
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Naveenchandru V.
Central Institute of Fisheries Education, Versova, Andheri – West, Mumbai-400061
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A. K. Verma
Central Institute of Fisheries Education, Versova, Andheri – West, Mumbai-400061
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Chandrakant M. H.
Central Institute of Fisheries Education, Versova, Andheri – West, Mumbai-400061
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Chandra Prakash
Central Institute of Fisheries Education, Versova, Andheri – West, Mumbai-400061
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Neelam Saharan
Central Institute of Fisheries Education, Versova, Andheri – West, Mumbai-400061
Abstract
Molluscan shells were used as bio-filter media for the growth of nitrifiers in the development of recirculating aquaculture system. While the first experiment was carried out with submerged biofilter, the second experiment was carried out with trickling biofilter in recirculating aquaculture system. Each of the treatment tanks was stocked with 35 gold fish fry having weight of 0.03 to 0.05 gm. Performance of two types of biofilters was studied with regard to their nitrification capacity, removal of toxic metabolites such as ammonia, nitrite, and nitrate, growth performance, survival of fishes and other parameters like Total Weight Gain, FCR, FCE, SGR, PER, etc. The results showed that both biofilter designs performed significantly better than their respective control groups (p<0.05); however, when performance of trickling and submerged biofilters was compared, trickling biofilter showed significantly better results in terms of percentage removal of NH3-87.51%, No2-96.43%, NO3-86.28%, the growth parameters (TWG–11.48±0.33, FCR-2.05±0.06, FCE-0.48±0.01, SGR-6.69±0.24, PER-1.12±0.03) and survival percentage (67.61%) than the submerged biofilter
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Keywords: Recirculating aquaculture system, trickling filter, submerged filter, nitrification.
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