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¹ Department of Fisheries, College of Agriculture, Bandar Abbas Branch, Islamic Azad University, P.O.Box:79159-1311, Bandar Abbas, Iran
² Young Researchers and Elites Club, Bandar Abbas Branch, Islamic Azad University, P.O.Box:79159-1311, Bandar Abbas, Iran
³ Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
⁴ Department of Food Hygiene and Aquatic Animals, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran DOI : 10.4194/1303-2712-v18_2_14 Viewed : 3657 - Downloaded : 3494 In this study, effects of Lactobacillus plantarum on growth performance, proteolytic enzymes activity and intestine morphology of Oncorhynchus mykiss were studied. Juvenile rainbow trout (n=270) in 3 administration groups in 9 cement tanks were kept and fed with diets containing different doses (0, 0.3 and 0.5 g kg-1 feed) of the probiotic for 90 days. Results showed a positive effect on growth performance in both treatment groups compared to the control group. Acidic protease activity in the lower dose of administration was higher in comparison with the higher dose and control groups. Alkaline protease activity and trypsin activities showed the same pattern with the higher level in treatment groups compared to the control group. No significant difference was observed between probiotic groups and control in intestine morphology. The current study showed that Lactobacillus plantarum can improve growth performance and protease activity in juvenile rainbow trout. Keywords : Rainbow trout, Lactobacillus plantarum, growth factor, enzyme activity, intestine morphology