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Probiotics are known to improve the growth rate of aquatic organisms. Little experimentation has focused on supplementation of live colony forming units ofL.sporogenes in Cirrhinus mrigala to access the growth performance. A feeding trial was conducted for 50 days to study the effects of Lactobacillus sporogenes on growth and body composition of Cirrhinus mrigala (Hamilton-Buchnan, 1822) fingerlings. Fishes were fed with five experimental feeds containing 3.31x105 colony forming units (CFU)/100g-1 of L. sporogenes in diet D2 , 1.65A—106 CFU/ 100g-1 in diet D3, 3.31A—106 CFU/100g-1 in diet D4 and 4.96A—106 CFU/100g-1 in diet D5. Control diet D1 was kept devoid of L. sporogenes. The diets prepared were containing 0.0% (D1), 0.1% (D2), 0.5% (D3), 1.0% (D4) and 1.5%(D5) of live cells of L. sporogenes CFU/100gm-1 of feed. Increasing trend of weight gain, specific growth rate (SGR), protein efficiency ratio (PER) improved food conversion ratio (FCR) was observed in treatments fed with probiotic added feeds than control feed. Best growth performance was found in the treatment fed with D4 of L. sporogenes containing 3.31A—106 CFU 100g-1 of feed. At increased level 4.96A—106 CFU 100g-1 of L. sporogenes inclusion the growth performance was dropped. Tissue protein content was also observed to be higher in animals fed with D4 feed. The lipid content was significantly (P<0.05) higher in fingerlings fed with control feed (D1). In short, L. sporogenes addition to a level of 3.31A—106 CFU 100g-1 in feed improved growth performance of C. mrigala fingerlings. Therefore, it is evident that 3.31A—106 CFU 100g-1 of feed of L. sporogenes can be considered as suitable concentration for attaining good growth in C.mrigala fingerlings.

Effect of feed supplemented exogenous bacteria, Lactobacillus sporogenes on the growth and body composition of Cirrhinus mrigala fingerlings