Abstract
Nile tilapia (Oreochromis niloticus) is an aquaculture commodity which has high production and tendency to be cultured in intensive culturing system. However, the latter can accumulate high amount of organic waste (leftover feed and fish feces) which will cause poor water quality by increasing total suspended solid (TSS) level and ammonia level as well. The solution to the prior problem is by using the aquaponic system with the addition of Nitrobacter and Nitrosomonas bacteria in the probiotic application. Still, the effective probiotic dosage is yet to discover, so that this study aims to figure out the effective dosage of the probiotic to decrease TSS and ammonia level. This study used RAL as research design with 5 treatments repeated 4 times: control (no addition of probiotic), 0.5 mg/L, 1 mg/L, 1.5 mg/L, and 2 mg/L. The result shows that 1.5 mg/L is the most effective dosage which can decrease TSS and ammonia level into 16.18 ± 0.0571 mg/L and 0.178 ± 0.0673 mg/L respectively.
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