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The effects of various levels of the commercial dietary supplement, Hoplite containing glucan, on growth performance, body composition and intestinal microbiota in white fish, Rutilus frisii kutum fry were investigated. 25 white fish fry (mean weight=1 ± 0.15 g) were stocked in each experimental tank (100 L). The fry were fed experimental diets supplemented with 0, 0.5, 1 and 2% Hoplite to apparent satiation, 3 times a day for 60 days. Biometry was performed every two weeks. Mean dissolved oxygen concentration, pH and water temperature recorded during the experiment were 5.0±0.1 mg/l, 7.8±0.2 and 24.4±0.11 ºC, respectively. At the end of the trial period, growth parameters, body composition and intestinal microbiota were studied. Results indicate that fry fed 0.5 and 1% glucan exhibited highest weight gain (WG), specific growth rate (SGR) and final body weight (FBW) which were significantly different (P

Keywords: Rutilus frisii kutum, Glucan, Growth factors, intestinal microbiota

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