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Abstract
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Probiotic supplementation may change the fish microbial flora of the intestine and modulate the immune defences and growth performance This study was conducted to evaluate the effect of food supplementation with L.plantarum , L.bulgaricus and Lactobacillus casei PTCC 1608 on growth performance and gut microbiota of Cyprinus carpio For this purpose, 480 C. carpio juveniles (40±6 gr Mean±DS) randomly were divided into groups (three replicates) and fed with diet containing 5×107 CFU g_1 of Lactobacillus plantarum (group A), Lactobacillus bulgaricus (group B) , Lactobacillus casei (group C) and control diet (group D) for 60 days To evaluate the persistent presence of the bacteria and effect on the microbiota of the digestive system, feeding remained fish of each group last from day 60 to 75 with free probiotic diet. Results showed that intestinal lactobacillus rate on days 30 and 60 of experiment significantly increased compared with the control group (P?0.05). At day 30 group B and C was most lactobacillus rate. Total intestinal bacteria on day 30 were significantly changed in group A and B compare to the group C and control group (P?0.05). At day 75 of experiment SGR of fish fed with diet containing L. bulgaricus was significantly increased compare to control group(P?0.05). In day 60 and 75 of experiment the FCR of fish fed with diet containing L. casei was significant increased compared to the control fish (P<0.05). PER of fish fed with diet containing L. casei at day 30 of experiment was significantly increased compare to control group (P?0.05). In day 30 and 75 of experiment the DWG of fish fed with diet containing L. casei was significantly increased compared to the control fish (P<0.05). Consequently L.bulgaricus and L. casei increased rate of beneficial bacterial in bacterial microflora in intestine and consequently induce growth promotion in treated fish then these can be a proper candidate as probiotic in carp.
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