This study was conducted to investigate the effect of high salinity on the blood parameters of common carp (Cyprinus carpio) which gradually exposed to salt concentrations of 5, 10 and 15g/liter, as well as tap water (control 0.1g/liter). 80 fish were randomly distributed to four salinity treatments with 2 replicates /treatment (10 fish / replicate) at average weight of 15 ± 3 g to study the effect of salinity on the blood parameters, which included packed cells volume(PCV), red blood cells (RBC), white blood cells (RBC) and hemoglobin (Hb). Results showed an increase in the (PCV) to 36.17, 40.15 to and 45.30% when the salinity increased to 5, 10 and 15g/l respectively, compared with the control treatment (33.14%). Hb reached 13.34, 14.56 and 15.80 mg/100 ml at the concentration of 5, 10 and 15 respectively, compared with the control treatment (12.15 mg/100ml). RBC reached 2.80, 2.93 and 3.1 × 10 6 cells/mm 3 respectively, in comparison with control (0.1 g/l), while the WBC increased to 12.88, 15.23 and 10.55 × 10 3 cells/mm 3 when the salt concentrations were 5, 10 and 15g/l respectively, compared with control (10.44 × 10 3 cells/mm 3 ).

The present study was conducted to investigate the effect of high salinity on some stress parameters of common carp (Cyprinus carpio), which gradually exposed to salt concentrations of 5, 10 and 15g/liter, as well as tap water (water without chlorine) (control 0.1g/liter) for 90 days. Eighty fish were randomly distributed on eight glass tanks with 2 replicates, 10 fish / replicate at average weight of 15 ± 3 g, to study the effect of salinity on the time appearance of feces and, the chemical analysis of the body composition .The results showed that the appearance time of feces was decreased with the rise of salt concentrations of common carp. As the passage of food through digestive tract took less time in high salinities. and the appearance of feces was after 4.16 hours of feed intake in a salt concentration of 15 g/liter, whereas it started after 5.22 hours in a saline concentration of 10 g/l and after 6.11 in a salt concentration of 5g/l in comparison with the control treatment (6.17 hours). Regarding the chemical analysis of the body composition, it was found that the moisture dropped with the rise of salinity, as it mounted to 77.09, 74.94 and 73.80% in the salt concentrations 5,10 and 15 g/l respectively, in comparison with the control treatment (78.45%).The percentage of protein decreased to 14.19, 13.89 and 13.74% in the salt concentrations 5, 10 and 15 g/l respectively, in comparison with the control treatment (14.28%).The percentage of fat amounted to 5.71, 5.68, and 5.66% in the salt concentrations 5,10 and 15 g/l respectively, in comparison with the control treatment (5.73%). whereas the percentage of ash was increased to 3.01, 5.40 and 6.80% with the increase in salinity to 5,10 and 15 g/l respectively ,compared with the control treatment (1.80%).

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