| چکیده انگلیسی مقاله |
The use of prebiotics in aquaculture has been shown to enhance growth performance, improve immune function, and increase disease resistance by modulating the gut microbiota. This study aimed to investigate the effects of the prebiotic Prodi 450 (containing mannan oligosaccharides and beta-glucans) on the growth performance and total biomass of chironomid larvae, which were used as food for Siberian sturgeon (Acipenser baerii) fingerlings. The study was conducted in two phases: first, to assess the impact of different prebiotic levels on chironomid larvae, and second, to evaluate the subsequent effects on sturgeon growth. Four treatment groups were prepared, each with a different dosage of Prodi 450: control (0 mg), P250 (250 mg), P500 (500 mg), and P750 (750 mg) per kg of chicken manure. This manure was used as a substrate for rearing chironomid larvae, with three replicates per treatment. After 10 days of cultivation at 25.71 ± 0.79°C, the larvae were harvested. The larvae were then fed to Siberian sturgeon fingerlings (initial average weight of 1.14 ± 0.04 g) for 14 days to evaluate the effects on their growth performance and immune indicators. The results showed that the highest average larval weight was observed in the P250 treatment (8.50 ± 0.50 mg). The P500 treatment exhibited the second-best growth performance, which was not significantly different from P250 but significantly higher than the control and P750 treatments (p<0.05). There were no significant differences in total biomass per unit area among the treatments (p>0.05). For the Siberian sturgeon, there were no significant differences in growth indices (p>0.05), although the P500 treatment exhibited slightly higher growth in most indices. In conclusion, while the prebiotic supplementation did not significantly increase the total biomass of chironomid larvae per unit area, it did produce heavier larvae, particularly at the P250 and P500 levels. However, the prebiotic supplementation did not significantly affect the growth performance of Siberian sturgeon fingerlings over the 14-day feeding period. |