ABSTRACT
Biofloc technology is emerging as one of the sustainable technologies to increase the aquaculture production. Tilapias, the second most farmed freshwater fish, have intrinsic feature like fast growth rate, disease resistance ability, low trophic level feeding and good flesh quality. To prevent and treat diseases in aquatic animals, antibiotics have been used for improving aquaculture production. Indiscriminate usage of antibiotics may result in the development of antibiotic resistant bacteria, antibiotic residues in the flesh and the microbial population destruction in the aquatic environment. The biofloc was developed and maintained in the 500 litres FRP tank according to Taw, 2006. Distillery spentwash as a carbon source was used to maintain C: N ratio at 10:1. The biofloc water sample was fortnightly screened for probiotic bacteria by spread plating on MRS agar. The immunological and haematological parameters were analysed and the graphs along with the standard deviation were constructed.
