Effect of dietary liquied Celmanax prebiotic on growth performance, feed efficiency and stress resistance in Common Carp (Cyprinus carpio Linnaeus. 1758) Fry

This experiment was conducted to evaluate the effect of different levels of commercial prebiotic of liquid Celmanax on growth performances, feed indices and challenged with environmental stress of Cyprinus carpio fry for 60 days. This experiment conducted in a completely random design with five treatments which contain triplicates. Four levels of prebiotic (0.3, 0.5, 0.7 and 1 cc.kg-1 of ration) were added to the basic diet with a control that was devoid of prebiotic. At the end of the experiment the results showed that, the use of Celmanax liquid in the diet of carps fry, especially at high levels, improved FW, FL, WG, ADG, PBWI, SGR, CF, SR, HIS, FCR, FCE, PER and LER significantly (p<0.05). But, there is no any significant difference between treatment's feed intake (p> 0.05). However, by measuring the resistance of carps fry to environmental stress conditions there was no any significant difference between experimental treatments in compared with the control group against acid pH (pH=2) and basic pH (pH=12) tests (p<0.05). But, increased fry resistance against high ammonia (5 mg/l) and high thermal (40 C˚) tests in treatment affected by prebiotic, and the highest resistance was recorded in treatment containing 1 cc.kg-1 liquied Celmanax (p<0.05). In conclusion, based on the results we could claim that addition of high level of liquid Celmanax (0.7 and 1 cc/kg) in supplemented diet of Cyprinus carpio fry’s improved growth performance, feed efficiency and resistance time to the challenge tests.