عنوان مقاله [English]
The aim of this studieswas to investigate the effect of tow commercial prebiotic including a-Max ultra and liquid Celmanax in biofloc technology (BFT) based systems on water quality parameters, growth performance, feeding efficiency and carcass composition of Cyprinus carpio fry. For these porpoise, a number of 240 C. carp fry with initial mean weight 4.09±0.70 g (±SD) in a completely randomized design was carried out with inoculation of 0.1 and 0.2 ml each of the prebiotics per liters of biofloc system and a control that was devoid of any substance for 40 days. At the end of experiments, a significant difference was observed in water quality parameters in the treatments of biofloc systems (P>0.05). Measurements of growth parameters including: final weight, final length, velocity of weight, velocity of length, protein efficiency ratio, lipid efficiency ratio and feed conversion efficiency had a significant differences with control group (P<0.05). Maximum of carcass crude protein (66.61%) and minimum of crude lipid (17.89%) was shown in a biofloc system with inoculation of 0.2 ml/liter of liquid Celmanax. The protein and lipid efficiency ratio had a significantly increased in experimental prebiotic treatments (P<0.05). In conclusion, the result of these study indicated that the used of A-Max Ultra and liquid Celmanax prebiotics via inoculation into water system of common carp rearing in a biofloc system had a positive effects on water quality parameters, growth performance, feeding efficiency and carcasses composition in this species.