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The protective effects of propolis on biochemical and hematological parameters were appraised in the blood of Oncorhynchus mykiss exposed to cypermethrin (CYP). The fish were subjected to three sublethal concentrations of CYP (0.0041, 0.0082 and 0.0123 ppm) and propolis (10 ppm) for 96 h. The samples were analysed to changes in the biochemical parameters, such as the metabolits: glucose, total protein, creatinine, urea, triglycerides, total cholesterol levels and the enzymes: Alanine Aminotransferase (ALT), Alanine Aminotransferase (AST), Alkaline Phosphatase (ALP), Lactate Dehydrogenase (LDH), amilase, Gamma Glutamyltransferase (GGT) and the electrolites: chloride, sodium, potassium, calcium, phosphate and ferric. Also, hematological parameters including total leucocyte count, granulocytes, agranulocytes and the erytrocyte count: Hemoglobin, hematocrit and the erytrocyte indexes: Mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC) were tested in fish blood. The data of this investigation showed that CYP had a negative effect on the biochemical and hematological variables of the fish these toxic effects were neutralised by the application of propolis. The results suggest that propolis can be effective in the prevention of CYP-induced toxicity in rainbow trout, especially hematopoiesis.