The Effect of Chemical Pollutants on The Blood Components of Two Types of Local Fish Within The City Oof Mosul

The current study included estimating the concentration of some industrial chemical pollutants (heavy metals) such as lead (Pb) and cadmium (Cd), which are thrown directly with industrial and agricultural waste and human activities into the Tigris River, within the city of Mosul, without any treatment, and, the study of some physical and chemical properties that affect the toxicity of these pollutants in the river, as well as, the effect of the bioaccumulation of the aforementioned minerals on some blood parameters in two types of local fish represented by the common carp Cyprinus Carpio and the royal thrush Condrostoma Regium. These are considered the most economically important fish and the most eaten by humans as food. Water and fish samples were collected monthly for the period from June 2018 to March 2019, from three locations on the Tigris River, represented by the beginning of the river entering the city of Mosul, the city center, and the south of the city. The results showed a variation in water temperature, electrical conductivity, pH function, total hardness, dissolved oxygen concentration, biochemical oxygen requirement, as well as the concentration of heavy metals represented by lead (Pb) and cadmium (Cd). The impact of environmental pollutants and the different seasons of the year and geographical locations resulted in a significant decrease in hemoglobin concentration (Hb), the volume of pressured blood cells (PCV), the total number of red blood cells (RBC), and an increase in the total number of white blood cells (WBC) in both types of local fish selected from the second and third locations compared to fish from the first location (controlling).