This study aims to determine the best density of Bacillus sp. which is given through feed to increase the body resistance of carp that is infected by pathogenic bacteria, Aeromonas hydrophila. The research was conducted at the Aquaculture Laboratory and Laboratory of Microbiology and Biotechnology at FPIK UNPAD. This study used an experimental method with a completely randomized design consisting of 4 treatments and 3 replications, namely treatment A (control), treatment B (Bacillus sp. 106 cfu/mL feed), treatment C (Bacillus sp. 108 cfu/mL feed) and treatment D (Bacillus sp. 1010 cfu/mL feed) for two weeks later in Aeromonas hydrophila infection with an intramuscular density of 108 cfu/mL for seven days. Observation parameters were clinical symptoms, fish response to feed, fish response to shock and survival. The results of this study showed that treatment C (Bacillus sp. 108 cfu/mL feed) resulted in 89% survival and reduced clinical symptoms.
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