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¹ Department of Zoology, Bharathiar University, Coimbatore – 641046, Tamilnadu, India DOI : 10.4194/1303-2712-v12_1_04 Viewed : 5459 - Downloaded : 6198 In this study, the live feed, Artemia franciscana naupli was enriched with probiotic bacterium, Lactobacillus sporogenes and fed to the freshwater prawn, Macrobrachium rosenbergii post larvae (PL) for attaining good survival, growth and contents of biochemical constituents. Artemia was enriched with different concentrations of L. sporogenes (15x10⁷, 30x10⁷, 45x10⁷ and 60x10⁷ cfu cells) and fed to M. rosenbergii PL (1,5 cm length and 0.03 g weight) for a period of 45 days. The PL fed with 60x10⁷ cfu cells of L. sporogenes enriched Artemia produced significantly (P<0.05) higher survival and growth when compared to that of other concentrations of L. sporogenes, and the control fed with un-enriched Artemia. The biomass increase, total weight gain, specific growth rate, condition factor and mean conversion ratio were found to be higher in PL fed with L. sporogenes enriched Artemia when compared with control. The enhanced growth performance of PL fed with L. sporogenes was further confirmed by the lower food conversion ratio recorded. The levels of biochemical constituents, such as total protein, amino acids, carbohydrate and lipid contents were found to significantly higher (P<0.05) in PL fed on L. sporogenes enriched Artemia particularly at 60x10⁷ cfu cells when compared to that of control. Significantly (P<0.05) higher ash and lower moisture contents were also observed in PL fed with 60x10⁷ cfu cells of L. sporogenes enriched Artemia. Therefore, it is evident that 60x10⁷ cfu cells of L. sporogenes can be considered as suitable concentration for attaining good survival and growth of M. rosenbergeii PL. Keywords : Lactobacillus sporogenes, Survival rate, Growth rate, Protein, Amino acid, Carbohydrate, Lipid, Ash