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Park, Youngjin,Moniruzzaman, Mohammad,Lee, Seunghan,Hong, Jeongwhui,Won, Seonghun,Lee, Jong Min,Yun, Hyeonho,Kim, Kang-Woong,Ko, Daegyun,Bai, Sungchul C. ACADEMIC PRESS LTD 2016 Fish & Shellfish Immunology Vol. No.
<P><B>Abstract</B></P> <P>An 8-week feeding trial was conducted to evaluate the effects of dietary probiotics on growth performance and non-specific immune responses in starry flounder, <I>Platichthys stellatus</I>. Fish averaging 46.5 ± 0.65 g (mean ± SD) were fed one of the six experimental diets; one control (Cont), and five other diets were prepared by supplementing single-probiotics 1 (<I>Bacillus subtilis</I>; SP<SUB>1</SUB>, 2 × 10<SUP>9</SUP> CFU kg<SUP>−1</SUP> diet), single-probiotics 2 (<I>Bacillus licheniformis</I>; SP<SUB>2</SUB>, 2 × 10<SUP>9</SUP> CFU kg<SUP>−1</SUP> diet), multi-probiotics 1 (<I>Bacillus subtilis</I> + <I>Bacillus licheniformis</I>; MP<SUB>1</SUB>, 2 × 10<SUP>9</SUP> CFU kg<SUP>−1</SUP> diet), multi-probiotics 2 (commercial probiotics; <I>Bacillus subtills</I> + <I>Bacillus licheniformis</I> + <I>Paenibacillus polymyxa</I> + <I>Aspergillus oryzae</I> + <I>Saccharomyces cerevisiae</I>; MP<SUB>2</SUB>, 2 × 10<SUP>9</SUP> CFU kg<SUP>−1</SUP> diet) and oxytetracycline (OTC) at 5 g OTC kg<SUP>−1</SUP> diet. At the end of 8 weeks feeding trial, weight gain (WG) and specific growth rate (SGR) of fish fed SP<SUB>1</SUB>, MP<SUB>1</SUB> and MP<SUB>2</SUB> diets were significantly higher than those of fish fed control diet (P < 0.05). Superoxide dismutase (SOD) activity of fish fed MP<SUB>2</SUB> diet was significantly higher than those of fish fed OTC diet (P < 0.05). Nitro blue tetrazolium (NBT) activity and lysozyme activity of fish fed SP<SUB>1</SUB>, MP<SUB>1</SUB> and MP<SUB>2</SUB> diets were significantly higher than those of fish fed OTC diet (P < 0.05). However, there was no significant difference among fish fed SP<SUB>1</SUB>, SP<SUB>2</SUB>, MP<SUB>1</SUB> and MP<SUB>2</SUB> diets. During the <I>Edwardsiella tarda</I> challenge test, the first mortality occurred on day 2. After the 14 days challenge test, cumulative survival rate of fish fed MP<SUB>1</SUB> and MP<SUB>2</SUB> diets were significantly higher than those of fish fed control diet (P < 0.05). However, there was no significant difference among fish fed SP<SUB>1</SUB>, SP<SUB>2</SUB>, MP<SUB>1</SUB>, MP<SUB>2</SUB> and OTC diets in survival rate at the termination of the challenge test. Although there was little advantage in immunological parameters with fish fed MP diets, single and multi-probiotics were equally effective statistically. These results demonstrated that single or multi-probiotics had equal beneficial effect as an antibiotic replacer in terms of growth performance, non-specific immune responses and disease resistance in starry flounder.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the effects of single and multi probiotics in starry flounder. </LI> <LI> Dietary single and multiprobiotics improved growth performance of fish. </LI> <LI> Dietary single and multiprobiotics improved non-specific immune responses in fish. </LI> <LI> Dietary single and multiprobiotics showed disease resistance against Edwardsiellosis. </LI> <LI> The study showed single and multiprobiotics were equally effective in starry flounder. </LI> </UL> </P>