تعيين سطح مطلوب پيش مخلوط ويتا ميني د ر جيره غذايي بچه ماهي سفيد د رياي خزر Kamenskii(و1901 و Rutilus fnisii kutum)

Determination of the optimum level of vitamin premix for the diet of Caspian frisii Kutum (Advanced fry )

Since macro-nutrients such as protein , lipid and starch has been worked out on advanced fry of Caspian frisii kutum in recent years; hence the other requirement such as multi-vitamin in the form of premixes must be known for the purpose of surveying the effect of different vitamin premix levels on growth index of Caspian frisii kutum, a nutritional experiment of 8 weeks was conducted in order to obtain optimum level on advanced fry stage. Three-hundred advanced fry with an average individual weight of 3± 0.8 gr were randomly stocked between 15 fiberglass tanks of 400 lit capacity eachwhich was filled with 300 lit freshwater . Water quality such as temperature , co2, pH , ... were maintained at optimum levels throughout experiment. Five semi-purified diets ranging 0, 1, 2, 3 and 4% vitamin premix ; with isonitrogenous (35%) were formulated and fed to triplicate group of fish, they were fed daily at rate of 8% of total body weight. With increase of vitamin premix in treatment 4 and 5 , all growth indices were improved and showed significant with other treatments (p<0.05). Fishes fed the diet with no vitamin premix (control diet ) showed unimprovement in all growth indices and significantly different with other treatments (p<0.05 ).Composition of body carcass in diet with no vitamin premix showed unimprovement and was significant difference with other treatments ( p<0.05 ).