عنوان مقاله [English]
Adding various enzymes compounds to the diet is a potential way to improve the nutritional value of nutrients. Natuzyme multi-enzyme contains protease, lipase, phytase, alpha-amylase, cellulase, amyloglucosidase, beta-glucanase, pentosonase, hemicellulase, xylanase, pectinase, acid phosphatase and phytase acid. Therefore, it seems Natuzyme multi-enzyme can be used to increase digestibility, eliminating anti-nutritional agents and improve the growth indices and reproductive performance of gold fish (Carassius auratus gibelio), and generally improve nutritional status.The purpose of this experiment is to use multi-enzyme Natuzyme in the Gold Fish diet (Carassius auratus) and to investigate its effects on growth, survival and reproductive performance. For this experiment, the fishes with the average weight of 5.56 ± 0.03 grams were used, and Natuzyme multi enzyme Plus® (Bioproton, Australia) in 5 treatments of 0, 250, 500, 750 and 1000 mg / kg food was added to the supplementary diet. The multi enzyme at enzyme level of 1 (250 mg / kg diet) established the best weight gain, specific growth rate, feed conversion ratio, body weight gain percentage and protein efficiency which was significantly different with the control group (P <0.05) but did not affect the survival rate (P> 0.05). The Natuzyme multi enzyme at enzyme level of 2 (500 mg / kg diet) produced the highest gonadosomatic index, fecundity, fertilization rate and larval survival rate (P <0.05). However, this multi enzyme at none of the experimental groups had any effect on hatchability and sperm motility (P> 0.05). It is suggested using this multi-enzyme in fish diets with high economic value and improve the growth and reproductive performance of fish.