Sobecka E., 2001. Changes in the iron level in the organs and tissues of wels catfish, Silurus glanis L. caused by nickel. Acta Ichthyol. Piscat. 31 (2): 127-143.

Bioaccumulation of nickel and the effect of nickel on the iron level in the tissues and organs of wels catfish, Silurus glanis L. were studied in the course of the present work. A number of blood parameters were determined e.g. erythrocyte count (RBC), leukocyte count (WBC), haemoglobin concentration (Hb), haematocrit value (Ht), and erythrocyte indices (MCH, MCV, MCHC) were calculated. On stained blood smears erythrocytes and leukocytes were differentiated. Effect of nickel on the activity of alanine aminotransferase (ALT) and alkaline phosphatase (ALP) in the blood serum was studied.