عنوان مقاله [English]
The use of zeolite was investigated to improve the environmental condition of common carp. The fingerlings of 13 grams were tested in 4 treatments. Each treatment contained 60 fish and 3 replications, in RBD experiment design. The treatment was performed 20, 40, 80 and 120 mg/l and one without zeolite as control. EC, T, O2 and salinity was equal but the amount of No2, NO3, NH4 and total hardness, was lower in zeolite treatment compared to the control group. Other parameters such as TDS, pH and sulfide were not different. The results showed that using zeolite can improve the water condition but the SGR, PER, FCR and total weight, in spite of pronounced difference between the dosage of 8 and 120 mg/l, the difference was not significant. In treatment of 80 mg/l, weight increased for 31%, GR for 29%, SGR for 29%, PER for 42%, more than the control group. FCR in the control group was 3.07 while in treatment with 80 mg/l zeolite, it was 2.34.The present study showed by using zeolite and by good management to improve the water condition, it is possible to improve the growth parameters of fish.