The aim of the study was to determine the best time interval for giving recombinant Epinephelus lanceolatus Growth Hormone (rElGH) in feed to increase growth of fish seed slice (Ompok hypopthalmus) in recirculation systems. Culture vessel in the form of aquarium of 60 x 40 x 40 centimeters of 15 aquarium with stocking density of 15 fish/m3. This research was using experimental method by complet…