Effects of dietary probiotic, Lactobacillus casei on some hematological and immunological parameters in Rainbow trout ( Oncorhynchus mykiss ) fingerlings

摘要

A 60 - day feeding trial was conducted to examine the effects of dietary Lactobacillus casei ( PTCC 1608) on some hematological and immunological parameters of Rainbow trout ( Oncorhynchus mykiss ). Four supplementation diets at the levels of 0, 5×10 6 , 5×10 7 and 5×10 8 CFU g - 1 of Lactobacillus casei were fed to Rainbow trout fingerlings (average weight 32.6 ± 5.5 g) in t hree replicates. Fish were hand - fed three times daily to apparent satiation . The results showed that no significant changes in hematological parameters and immunological indices such as NBT and complement activity. The highest activity rate of serum lysozy me activity was seen in T2 group (P<0.05). Concluded that Lactobacillus casei fed to the rainbow trout, with the quantity of 5×10 . and 5×10 . CFU g - 1, can improve the performance of the immune system, but it is no effect on hematological indices.