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THE EFFECTS OF DIFFERENT DENSITIES ON THE GROWTH PERFORMANCE AND FEEDING EFFICIENCY OF COMMON CARP FRY IN RECIRCULATING AQUACULTURE SYSTEMS
Abstract
This paper aims to study the effects of different densities on growth performance and feeding efficiency of common carp fry (Cyprinus carpio L.) growth in Recirculating Aquaculture Systems (RAS). Recirculating Aquaculture Systems (RAS) utilization have more advantage like: fish growth control, feeding management, diseases control, and water quality management and waste discharge in land-based aquaculture. The experiment was performed for 31 days, fish biomass being equally distributed into eight growth units. The average initial body weight of fish was 1.50 g (W), and the total length of 3.84 mm (TL). The fish were divided into four experimental groups, in duplicate: V1 ? 0.6 kg/m3, V2 ? 0.9 kg/m3, V3 ? 1.2 kg/m3, V4 ? 1.5 kg/m3. At the end of experiment, a higher specific growth rate (SGR) with lower feed conversion ratio (FCR) was observed in the small stocking density group V1 with the average SGR (2.2%/day) and average FCR 1.5 (g feed/g biomass growth) compared with the others stocking density groups: V2 with SGR (1.7%/day); FCR 2.2 (g/g), V3with SGR (1.3%/day); FCR 3.3 (g/g) and V4 with SGR (1.0%/day); FCR 4.2 (g/g). However, it was concluded that choosing a low stocking density is much sustainable in terms of growth performance. Consequently, the appropriate stocking density recommended for growing common carp fry in a RAS is between 0.6 kg/m3 and 0.9 kg/m3. Additionally, the parameters measured in this study may be useful to determine the welfare and health of fish cultured in a RAS, particularly related to increased stocking densities. In conclusion, high stocking density resulted in better growth on growth performance of the common carp, suggesting that the welfare of the common carp fry at this size could be affected by high fish density.
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