Mohammad Hamed Najafi ENFERADI, Flora MOHAMMADIZADEH, Mehdi SOLTANI, Amir Hooshang BAHRI, Najmeh SHEIKHZADEH

Effects of Lactobacillus plantarum on Growth Performance, Proteolytic Enzymes Activity and Intestine Morphology in Rainbow Trout (Oncorhynchus mykiss)

In this study, effects of Lactobacillus plantarum on growth performance, proteolytic enzymes activity and intestinemorphology of Oncorhynchus mykiss were studied. Juvenile rainbow trout (n=270) in 3 administration groups in 9 cementtanks 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. Resultsshowed a positive effect on growth performance in both treatment groups compared to the control group. Acidic proteaseactivity in the lower dose of administration was higher in comparison with the higher dose and control groups. Alkalineprotease activity and trypsin activities showed the same pattern with the higher level in treatment groups compared to thecontrol group. No significant difference was observed between probiotic groups and control in intestine morphology. Thecurrent study showed that Lactobacillus plantarum can improve growth performance and protease activity in juvenile rainbowtrout.

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