Putra, Achmad Noerkhaerin (2020) Biotropia The Southeast Asian Journal of Tropical Biology. Effect of dietary probiotic Bacillus NP5 on the growth performances of catfish (Clarias sp.), 27 (1). pp. 51-59. ISSN 1907-770X

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Abstract

Probiotics have long been applied to aquaculture and produce positive effects on fish and shrimp. This research aimed to evaluate the effect of Bacillus NP5 as probiotic to promote the growth of catfish (Clarias sp.). Five doses Bacillus NP5 with 3 replicates, namely control, 0.5% probiotic, 1% probiotic, 1.5% probiotic and 2% probiotic (g/100 g feed) were used. The results showed that application of probiotic in catfish fed can promote better growth performance compared to control. Total digestibility and protease enzyme activites were significantly highest (P<0.05) in 1% probiotic (56.03±1.13%, 0.70±0.04 U/min/mL). The best value (P<0.05) of specific growth rate showed in 1% probiotic (2.67±0.18% day-1), followed by 2% probiotic (2.63±0.02% day-1), 1.5% probiotic (2.42±0.07% day-1), 0.5% probiotic (2.29±0.14% day-1) and control (1.60±0.01% day-1). The addition of 1% Bacillus NP5 as probiotic in catfish fed showed the best result on protease enzyme activities, protein digestibility, dry matter digestibility, the final weight, specific growth rate, weight gain, feed efficiency and protein efficiency ratio than other probiotic doses.

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