تاثير پربيوتيك ايمونوژن در جيره غذايي بر شاخص هاي رشد و بازماندگي فيل ماهيان جوان پرورشي(Huso huso Linne, 1758)

Effect of dietary immunogen prebiotic on growth and survival indices of giant sturgeon (Huso huso Linne, 1758) juveniles

The use of prebiotics, nondigestible dietary ingredients that beneficially affect the host by selectively stimulating the growth and /or activating the metabolism of health- promoting bacteria in the intestinal tract, is a novel concept in aquaculture. This survey was conducted for evalution the efficiency of commercial prebiotic immunogen in five treatments (0, 0.5%, 1%, 2%, 4%) in ration of giant sturgeon {Huso huso) juveniles in 3 weight range of small fishes with average weight 8.71±0.02 gr, medium fishes with average weight 25.15±0.01 gr and large fishes with average weight 53.69±0.02 gr. fishes were fed up six meals a day. The trial at period 8-week was conducted in Shahid Marjani Sturgeon hatchery of breeding and culture in summer 2009. At the end of culture period, growth performance and survival rate for giant sturgeon juveniles compared. The results showed that difference in average of weight, length, daily growth, body weight increase percent, specific growth rate percent and condition factor of fishes fed by diets containing 0.5% and 1% immunogen significantly (P<0.05) higher than control group. Difference food conversion rate in fishes fed the diets supplemented with 0.5% and 1% prebiotic immunogen significantly (P<0.05) lower than control group. Survival rate in fishes fed contained 0.5% prebiotic immunogen was higher than fishes fed by basal diet but there was not statistically significant (,P>0.05). Based on these data, it is concluded that immunogen prebiotic in lower level can serve as functional feedstuffs in the diet of giant sturgeon juveniles by enhancing growth performance and survival.