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Neemazal-T/S is an organic pesticide that is a commercial form of azadirachtin (AZA). In this study, the common carp fish (Cyprinus carpio) was exposed to different concentrations ofAZA (1.2 and 24 ppm) in acute (4 days) and subchronic (30 days) periods. The aim of this study is to evaluate the hematological, antioxidant and histopathological effects ofAZA on carp. Total leukocyte count (WBC), granulocyte count, hematocrit (Hct), hemoglobin (Hb), mean corpuscular volume (MCV) and mean corpuscular hemoglobin (MCH) values were decreased in 24 ppm exposure whereas there was an increase in mean corpuscular hemoglobin concentration (MCHC) level and there wasn't any difference was found in monocyte ratios. In time-dependent comparisons; WBC, lymphocyte, granulocyte ratios, Hb concentration and Hct values were statistically significant in 24 ppm exposure in the subchronic pe-riod. Increase in …