This study aims to test the effectiveness of amino acid lysine in artificial feed in increasing feed efficiency of bileh fish fry (Rasbora sp.). The experimental design used was a non-factorial completely randomized design (CRD) with five treatments and three replications. The treatments included: feed without lysine (P0), feed with lysine 1.2%/kg (P1), 1.4%/kg (P2), 1.6%/kg (P3), and 1.8%/kg (P4). The fish fry used amounted to 10 fish per container with a size of 2 cm and a weight of 0.10 grams, reared for 40 days. The results of data analysis using ANOVA showed that the provision of amino acid lysine had a significant effect on specific growth rate, but no significant effect on survival, feed conversion ratio and feed efficiency.
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