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This research aimed to study the effects of supplying bioflocs on nile tilapia culture. Juveniles of nile tilapia weighing average of 0.67 g were fed with five diets formulated with 35% protein and replaced fish meal with biofloc in 0, 20, 40, 80 and 100%. Each group of fish was stocked in cement tank (30 fish/tank) and was
fed three times a day for seven weeks. Studies found that replacing fish meal with 100% of biofloc had average daily gain as 1.62 ± 0.30 g/day. Survival rate was 54.33 ± 12.50 and feed conversion ratio was 1.48 ± 0.20, respectively. Regarding to water quality during the experiment, ammonia concentrations ranged from
0.09 to 2.03 mg/L. Nitrite concentrations ranged from 0.02 to 1.90 mg/L, pH was 7.1-7.6. Dissolved oxygen ranged from 9.70 to 15.49 mg/L, the alkalinity was 64.73-89.37 mg/L, totally hardness was 102.31 -144.68 mg/L and temperature were 26.33 and 27.33 degrees Celsius. The growth and survival were not significantly differences. The results showed a trend to replace fish meal with Biofloc for tilapia feed.
differences. The results showed a trend to replace fish meal with Biofloc for tilapia feed.