author(s)
Zahra M Al-Turaihi and AJ Al-Rudainy

abstract
A total of 235 specimens of Cyprinus. carpio was examined to detect the external monogenean parasite infested the skin, fins and gills, represented five species (Gyrodactylus elegans, Dactylogyrus extensus, D. achamerowi, D. minutus and D. vastator), treated with different concentrations of water and alcohol extracts of Melia azedarach fruits, treated treatments were : T1, control (without treated including infected and non- infected fish) ; T2, 1% ; T3, 2% ; T4, 3% ; T5, 4% and T6, 5% by applying dip method in a water bath for 24h. The results showed that the higher the concentration of the both extracts, the greater the mortality ratio of the five parasites achieved 100% in T6 (5%). Blood parameters of infected fishes before and after treatment with water and alcohol extracts of M. azedarach fruits were changed, the results of water extract showed no significant differences in red blood cell (RBC) counts betweenT6 (5%) compared to the other treatments, and the values of white blood cell (WBC) were decreased with increasing the concentrations of water extract, decreased from 36.79×103 in T2(1%) to 29. 24 ×103 in T6 (5%). Packed cell volume (PCV) and hemoglobin (Hb) showed no significant differences (p>0.05) between treatments, also between T6 and non- infected control treatment. The values of RBCs count have increase with the increasing of alcohol extract concentrations ranging between 0.90 × 106 in T2(1%) to 1.27×10 6 in T6 (5%). No significant differences (p > 0.05) between the five experimental treatments, increased significant (p≤ 0.05) when compared with infected control treatment. The mean values of WBCs have decreased with increasing the concentrations of alcoholic extract, which decreased from 37.49 in T2(1%) to 27.04 ×103 in T6 (5%), also significant differences (p≤ 0.05) between T2 compared to T5 and T6, while no significant occurs among T2, T3 and T4. The mean values of PCV and Hb for treatments ranged between 21.33 – 25.50% and 7.06 – 8.47g/dl in T2 and T6 respectively. Results of statistical analysis of PCV and Hb showed no significant differences (p>0.05) between all treatments, also between T6 and non- infected control treatment.