ABSTRACT
The erythrocytes indexes (MCV, MCH and MCHC) and the type of anaemia on Gibelio carp (Carassius gibelio) after influence of increasing zinc concentrations (0.1, 0.5, 1.0, 1,5 and 2.0 mg.l−1) were established. Size increasing of the erythrocytes (MCV) and decreasing the haemoglobin concentration in the whole blood (MCHC) and in one erythrocyte (MCH) caused by zinc were found. It was ascertained that the zinc causes a hypochrome type of anemia by all concentrations and was observed the trend of shift from microcyte to macrocyte type when zinc concentration increases.