Vol. 9, Special Issue 2, Part F (2025)

The increase in fish demand for human consumption has pushed the aquaculture industry towards intensified culture systems, but has increased the risk of infectious diseases. However, use of antibiotics has led to negative impact on the environment. This has spurred several researchers and biotechnology companies to develop an eco-friendly feed additive. The current experiment was carried in 250 l capacity FRP tanks for 90 days. Amur common crap (Cyprinus carpio haematopterus) fingerlings of 7.50g average weight were taken in triplicate with a stocking density of 15 fish/tank. The fish were fed at 5% of body weight with diets T₁ (0.5% Bacillus amyloliquefaciens), T₂ (1% Bacillus amyloliquefaciens), T₃ (1.5% Bacillus amyloliquefaciens) and T₀ (control without any additives). The growth parameters such as weight gain, weight gain percentage, SGR and PER were highest in fish fed with T₁ diet. Also, the lowest FCR was observed in fish fed with T₁ diet. The highest survival rate was recorded in fish fed with T₁ and T₂ diet and lowest was found in T₀. The water quality parameters like temperature, pH, dissolved oxygen, free carbon dioxide, total alkalinity, NH₃-N, NO₂-N, NO₃-N and total hardness were in a normal range. Thus, the present findings indicate positive impact on the dietary Bacillus amyloliquefaciens on growth performance and water quality of Amur common carp (Cyprinus carpio haematopterus).