Effect of Dietary Supplementation of Biogen registered (Commercial Probiotic) on Mono-Sex Nile tilapia Oreochromis niloticus under Different Stocking Densities

摘要

The present study was carried out to evaluate the effects of dietary supplementation of a commercial probiotic Biogen registered on growth performance, carcass composition, blood hematological and biochemical parameters, histometric characteristics of fish dorsal muscles and economic efficiency of mono-sex Nile tilapia Oreochromis niloticus under different stocking densities. Therefore, fish with similar body weight (12.71 plus or minus 0.17 g) were distributed randomly into seven treatments at different stocking densities, being 10 fish m super(-3) which fed a basal diet without Biogen registered (T sub(1)), 10 fish m super(-3) (T sub(2)), 20 fish m super(-3) (T sub(3)), 30 fish m super(-3) (T sub(4)), 40 fish m super(-3) (T sub(5)), 50 fish m super(-3) (T sub(6)) and 60 fish m super(-3) (T sub(7)), which were fed the basal diet but supplemented with 3 g Biogen registered kg super(-1) diet for 14 weeks. The obtained results indicated that T sub(4) was the best treatment which realized significantly (p less than or equal to 0.05) increases of all growth performance parameters (final weight, AWG, ADG and SGR), hematological parameters (hemoglobin, RBCs count, PCV, blood platelets and WBCs count), plasma proteins (total protein, albumin, globulin and albumin/globulin ratio), improved FCR, blood indices (MCV, MCH and MCHC), differentiation of leukocytes, carcass composition, histometric characteristics of fish dorsal muscles and best economic efficiency. There were no adverse effects on water quality criteria among all experimental treatments. Consequently, from the obtained results, it could be concluded that the inclusion of the commercial probiotic Biogen registered at a level of 3 g kg super(-1) diet at stocking density rate of 30 fish m super(-3) of mono-sex Nile tilapia O. niloticus is useful to get the best fish performance with friendly effects on the environment.