The aim of this research is to determine the optimal dose of papain added to commercial feed to enhance the growth of Nilem fish fry (Osteochilus hasselti). The study utilized 15 aquariums, each measuring 60 x 40 x 40 cm, with a stocking density of 20 fish /m³. This research employed an experimental method using a completely randomized design (CRD) with a single factor, five treatments, and th…