نوع مقاله : مقاله پژوهشی
1 گروه بهداشت و بیماریهای آبزیان، دانشکده علوم تخصصی دامپزشکی، واحد علوم و تحیقات، دانشگاه آزاد اسلامی، تهران، ایران.
2 مدیریت بهداشت و کنترل بیماری های آبزیان، سازمان دامپزشکی، تهران، ایران.
عنوان مقاله [English]
Due to the importance of aquatic nutrition from quality and economic aspects in aquaculture many studies have been carried out on the replacement, decreasing and omission of feed for organic aquatic production. The aim of this study has been complete omitting of artificial feed by using the synergistic effect of warm water fish polyculture. The study was performed for two consecutive years in “Amin Abad” aquaculture research center of veterinary faculty. Amongst the warm water fish; common carp as omnivore, silver carp as phytophagous and bighead carp as a zooplanktophagous fishes were used for this phenomenon study. The composition of fish in our polyculture system was as follows: 30% common carp, 65% of silver carp and 5% of big head carp, initial individual weight of 4.5 g, 30 g and 30 g, respectively. In the first year after 206 days the final weight of common carp, silver and big head carp were 850 g, 712 g and 1750 g, respectively. While in the control mono species culture, the final weights of common and silver carp were 365 g and 375 g, respectively. In the second year the rate of production in synergical culture without consuming feed was 4912.4 kg/ha, whereas, in control system with the artificial feed was 4817 kg/ha.The results of this study showed that suitable individual growth of fish species, the higher total production and the total prices due to omission of feed in synergistic culture achieved the more benefits than the control cultures of warm water fish consuming the artificial feeds.