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The effect of sublethal concentrations of cadmium on some haematological parameters of juvenile sterlet, Acipenser ruthenus. For this purpose, 60 fish (41.69 ± 0.95 g and 23.98 ± 0.14 cm) were randomly divided into four experimental groups and exposed to 0 (control), 16, 32 and 64 μg/L Cd concentration, each in 3 replicates for 21 days. The hematological parameters, including red and white blood counts, differential white blood count, hematocrit (Hct), hemoglobin (Hb), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC) and white to red cells ratio were determined using standard methods. The highest level of Hct (30.57 ± 1.91%) was observed in fish exposed to 64 µg/L (p<0.05). The highest mean values of Hb (10.01 ± 0.63 and 10.47 ± 0.57 g/dL) were measured in the fish exposed to 32 and 64 µg/L of Cd, respectively, which was significantly higher than Hb values in the control (8.24 ± 0.38 g/dL). For the rest of parameters, there were no significant differences between fish exposed to different Cd doses (p>0.05). The results indicated at least some deleterious effects of sublethal concentration of Cd on some hematological parameters of sterlet, which maybe reflecting the stress response as well as deleterious effects on haemopoietic tissues.The study of long term effects of Cd exposure of starlet is suggested.

Keywords: heavy metal, Sturgeon, Hematological parameters

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