Comparison effects of Lactobasillos bulgaricus microencapsulated by nano alginat/chitosan on Growth performance and Feed efficiency great sturgeon (Huso huso) juveniles.

In aquaculture the fast growth, high feed efficiency and increased resistance against pathogens are favorable. One of the suitable approaches for improving the growth indices and resistance against pathogens is the application of probiotic bacteria. The present study was conducted to evaluate the effect of nano/microencapsulated Lactobasillus bulgaricus by nano alginate/chitosan on the growth rate and feeding efficiency of great sturgeon (Huso huso) juveniles. This experiment was conducted in a completely random design in four groups and group (5) with triplicate. 375 fish weighing (27.28±2.86 gr mean±SD), were randomly divided in to five equal groups in triplicates. The test groups were as follows: fish in T1 were fed with alginate/chitosan without bacterium, fish in T2 were fed with encapsulated bacteria with emulsification method, fish in T3 were fed with encapsulated bacteria with Ionicgelation method, fish in T4 were fed with only bacteria and control group. The fish were fed 3% of body weight per day. The results showed the highest feed conversion ratio (FCR) was measured in T3 (1.64±0.11) and the lowest was observed in T4 (1.14±0.06).The highest values of SGR, PER, FER in T4 were seen among the treatments at days 30 and 60. According the result, nanoalginat/Chithosan used for encapsulation of probiotics can be lead to decrease in growth performance compared to the other treatments.