نوع مقاله : مقاله پژوهشی
1 موسسه تحقیقات بینالمللی تاسماهیان دریای خزر، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، گیلان، ایران
2 گروه آبزی پروری، مرکز آموزش و تحقیقات کشاورزی و منابع طبیعی گیلان، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، گیلان، ایران
عنوان مقاله [English]
This study was carried out to increase production efficiency of Persian sturgeon Acipenser persicus fingerlings. In this experiment, 600 pieces of Persian sturgeonfingerlings (10.76 ± 0.74 g in weight and 14.49 ± 0.7 cm in total length) in four treatments were introduced into twelve fiberglass tanks with 300-L water capacity for 60 days. The treatments were fed with diets containing 0, 150, 300 and 450 mg of four bacterial strains including Lactococcus lactis, Pediococcus pentosaceus, Weissella cibaria and Enterococcus faecalis powder per kg pelleted diets to make certain concentrations including 0 (T1), 1.5 × 109 (T2), 3 × 109 (T3) and 4.5 × 109 CFU/g (T4). The results showed that there was no significant difference in growth indices in different treatments (p>0.05). However, the maximum and minimum mean final weights were observed in T2 and T1, respectively. The minimum and maximum values of liver enzymatic indices, LDH, IgM, lysozyme activity and the number of colonial intestine bacterial flora were observed in T2 and T1, respectively, significantly different from the other treatments (p<0.05). The maximum and minimum number of intestinal lactic acid (probiotic) bacteria were also found in T2 and T4, respectively, significantly different from the others (p<0.05). In spite of the fact that a probiotic-supplemented diet could not exhibit a significant effect on growth indices of the Persian sturgeon fingerlings at the weight range of 10-60 g, however, those containing 1.5 × 109 CFU/g (T2), significantly enhanced the immunity, enzymatic and bacterial flora of the intestine.