A comparison of Separate and Combined Levels of Commercial Multienzymes on Feeding Efficiency and Carcass Chemical Composition of Common Carp (Cyprinus carpio)

Enzymes are organic catalysts that trigger and/or accelerate chemical reactions. This research was done to compare the separate and combined levels of commercial multienzymes on feeding efficiency and carcass chemical composition of common carp (Cyprinus carpio). Total number of 96 common carp fingerlings weighing 13.06±2.56g were distributed in six treatments including control (without multienzyme), 1 g/kg Combo, 1.5 g/kg Combo, 1 g/kg Natuzyme Plus, 1.5 g/kg Natuzyme Plus and mixture of 1g/kg Combo+1 g/kg Natuzyme Plus in two replicates for 8 weeks. Growth indices such as the final weight, percentage of body weight increase, specific growth rate, food conversion ratio and average daily growth in treatment 1g/kg Natuzyme Plus showed significant differences compared to other experimental treatments (P<0.05). Also, all experimental treatments had better condition in comparison with the control. The highest condition factor was seen in fish fed 1.5 g/kg Natuzyme Plus which showed significant difference with 1.5 g/kg Combo (P<0.05). Common carp fingerlings fed mixture of Combo+Natuzyme Plus recorded a slight increase in protein content of carcass compared to other dietary treatments. Fish fed multienzymes had less (P>0.05) lipid content of carcass in comparison with the control. There was no significant difference in ash and moisture contents of carcass (P>0.05). According to results, it can be stated that Natuzyme Plus at the level of 1.5 g/kg can be effective in improvement of growth performance and feed efficiency in farmed common carp fingerlings.