ABSTRACT This research was conducted on December 2019 until February 2020. The purpose of this study was to obtain the best dose of yeast added in feed to increase feed efficiency and growth of siamese catfish (P. hypophthalmus) seed. The test fish used in this research were siamese catfish (P. hypopthalamus) sized 2,67±0,46 g. Raised in 15 units of cages measuring 1 x 1 x 1( m3) with sto…