The present study aimed to evaluate the effect of dietary zeolite on ammonia toxicity and in some of blood parameters in Cyprinus carpio. Fish were fed   either a control diets (0% zeolite) or control diet supplemented with 2, 4 and 6% (T1, T2 and T3) respectively for 28 days. Results showed that the mean value of ammonia concentrations ranged between 0.10 mg/l in T1 and T3 in the first week to 1.85 mg/l in control in fourth week, which could be noticed a gradually increased in the values of ammonia in the end of the experiment. Results showed that the ammonia concentration has a significant (p≤ 0.05) increased in control treatment for third and fourth week compared with other treatments. For blood parameters, results showed high fluctuation in the mean values of RBC count, the mean of WBC count recorded the highest value in control treatment, and significantly decreased in T1,T2 and T3. PCV value  and Hb content  recorded the  lowest values in control treatment and the highest values in T1,T2 and T3 respectively. It can be concluded that T3 have reached the saturation point for lower values in the first three weeks of ammonia ,  then the active of zeolite decreased resulted increasing ammonia in fourth week  for all treatments.

The current study was undertaken to investigate the efficacy of different levels of natural zeolite on ammonia and on some of blood parameters of Cyprinus carpio. The experimental treatments included adding zeolite as stones placed in the bottom of aquarium : Control( 0  zeolite); T1, T2 and T3 zeolite stones were added in the water at concentrations of 6 , 8 and 10 mg/l respectively. Results of ammonia concentrations ranged between 0.17 – 1.25 mg/l in T2 and in control treatment respectively from the first week up to fourth week. In T1 values of ammonia were 0.18mg/l in first week with gradually increase from 0.48 mg/l in second week and 0.78mg/l in the third week, then decline to 0.66mg/l in the fourth week, same condition was found in T2 and T3. In the second week level of ammonia was increased highly in control treatment , compared to other treatments. In the third week the increasing level of ammonia was continuously especially in control treatment followed by T3,T2 and T1 respectively. In the fourth week the level of ammonia recorded 1.25 mg/l , but decrease in T3  which reached 0.62mg/l. No mortalities were recorded in the first week for all treatments during the experimental period, while, in the fourth week in control reached up to 100% mortality  compared with the T1,T2 and T3 which recorded 50, 33.33 and 33.33% respectively . Generally results showed that ammonia and mortality were decreased with increased zeolite level in water. Results of RBC ranged between 2.05 – 2.33 ×106/mm3 in control treatment and T3 respectively .The highest number  of WBC in the control treatment which recorded 24.55 ×103/mm3 , while the lowest number was document  in T2 (23.01×103/mm3) . The highest PCV(%) was registered inT3(26.50%). For Hb content the highest mean was  reported in T3 (9.70g/dl). T3  can be considered as better treatment which contained zeolite in blood parameters  followed by T2.