<![CDATA[ABSTRACT Biofertilizer is active biological product contain of microbes. Liquid biofertilizer in aquaculture contains Bacillus sp. The utilization of Bacillus sp. in aquaculture is aimed to keep balancing of microbes in digestive, increasing nutrient absorbtion rate and improving water quality, therefore it can preserve survival rate and growth of fish. The aim of this research was to find out the effect of liquid biofertilizer in media rearing for water quality, survival rate, growth and feed efficiency of nile tilapia. This research was conducted from January to May 2015 at Budidaya Perairan Laboratory, Budidaya Perairan Study Program, Agricultural Faculty, Sriwijaya University, Indralaya. This research used Completely Randomized Design (CRD) with seven treatments. The liquid biofertilizer was in added rearing media every week with different concentrations were 0; 0.5 µl.L-1; 1 µl.L-1; 1.5 µl.L-1; 2 µl.L-1; 2.5 µl.L-1; 3 µl.L-1. Parameters observed included water quality, survival rate, growth, and feed efficiency. Liquid biofertilizer addition in water media rearing didn’t show significant role to water quality, and it didn’t significant show different with survival rate, growth, and feed efficiency of tilapia. Additional liquid biofertilizer in 2.5 µl.L-1 dan 3 µl.L- 1 showed the highest survival rate (85%), where as the best concentration of liquid biofertilizer for growth was 1.5 µl.L-1 (4.82 g), and the best concentration of liquid biofertilizer for feed efficiency was 2.5 µl.L-1 (91.8 %). Keywords : Biofertilizer, Bacillus sp, Tilapia]]>
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