Application of Biofloc in Nile Tilapia (Oreochromis niloticus) Diet

Abstract

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.