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In this study, the impact of a probiotic product, Promarine was evaluated on the growth responses of post larvae of Indian white prawn, Fenneropenaeus indicus. There were three treatments and a control in the study. Promarine was either 3 separately administered through water at 15 ppm/m (Treatment 1) and through a commercial feed containing 35% protein at a concentration of 0.5% (Treatment 2) or in combination through water and feed (Treatment 3). The control was maintained without administering Promarine. The experiment lasted for a period of 90 days in fiber glass tanks (200 liter). Higher growth rates were observed in juveniles grown on Promarine through feed (Treatment 2) and water (treatment 1) when compared with Treatment 3 and control. There were no significant differences in water ammonia and nitrite concentrations among the treatments. Promarine was found to enhance growth and survival of post larvae of F. indicus. Keywords