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IJSRP, Volume 8, Issue 5, May 2018 Edition [ISSN 2250-3153]



      Nguyen Tan Duy, Ly Van Khanh

Abstract: Study was conducted to evaluate effect of C:N ratio on growth and survival rate of spotted scat fingerlings in biofloc system. Spotted scat with initial size of 0.149±0.03 g was reared in 100 L tank at salinity of 5 ppt. Experiment includes 4 treatments with C:N ratios: (i) no molasses addition (control), (ii) C:N=10, (iii) C:N=15, (iv) C:N=20. Each treatment was triplicated, and experiment lasted for 45 days. Spotted scat was reared at density of 500 ind/m3 and molasses was supplied every 3 days. Treatment with C:N=15 has the highest floc volume (7.33±2.08 ml/L) and total bacteria (650±122×104 CFU/mL), the lowest Vibrio rate (0.21±0.07%). Fish reared at C:N=15 has highest average weight (0.97 g/ind), growth rate in weight (0.020 g/day, 4.07 %/day), survival rate (86.0±2.00%), biomass (416±35.5 g/m3), it was also the lowest FCR (1.39±0.15) and they all differed significantly with the other treatments (p<0.05).

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Nguyen Tan Duy, Ly Van Khanh (2018); Effect of molasses addition at different C:N ratios on growth and survival rate of spotted scat (Scatophagus argus) fingerling in biofloc system; International Journal of Scientific and Research Publications (IJSRP) 8(5) (ISSN: 2250-3153), DOI: http://dx.doi.org/10.29322/IJSRP.8.5.2018.p7759

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