| Summary: | Haematological parameters reflect the condition of fish much faster than determining other parameters because they change extremely quickly as environmental conditions change, which is why they are widely used to describe the health of fish. Haematological and biochemical parameters can be used as standard laboratory tests to determine the effects of metabolic disorders caused by the action of xenobiotics. The purpose of this paper is to investigate changes in haematological parameters (erythrocytes, leukocytes, blood glucose levels) in perch Perca fluviatilis Linnaeus, 1758 - in experimental intoxications with phenols (0.01 and 0.001 mg/l), ammonia (0.01 and 0.001 mg/l), some pesticides (Talstar One, Tilt 250 EC, Roundup® - in concentrations of 0.01 and 0.001 ml/l water) and two heavy metals (Cu and Pb, in a concentration of 0.01 and 0.001 mg/l). The tested substances produced changes of the mentioned parameters, the intoxications being followed, in most cases by the decrease of the average number of erythrocytes and the change of the glycaemic level.
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