Abstract
Applying biofloc techniques at different C:N ratios in culture tilapia was done in order to determine the appropriate C:N rate for better fish growth performance. The experiment was conducted with completely randomized design including five treatments of different C:N ratios (10, 15, 20, 15 and control treatment). Each treatment was triplicated. The mono-sex tilapia (8.43 g, 7.83 cm) were stocked at 40 fish/m3 in composite tanks (0.5 m3) with water salinity of 10‰. After 6 months of culture, the best fish growth performance was found in treatments of C:N=15 (282,8 g/fish and 1,37 %/day) and C:N=20 (267,9 g/fish and 1,36%/day). Fish production in treatments of C:N=15 (8.56 kg/m3) and C:N=20 (9.01 kg/m3) was significantly higher than that of control treatment. Moreover, the lowest FCR was found in treatments of C:N=20 (1.48) and C:N=15 (1.58). The survival rate was above 80% in treatment of C:N=20 and C:N=15. Fish sensory quality was not of significant difference among treatments.
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