Abstract
Thermal changes in water cause many metabolic changes that manifest themselves in physiological fish adaptations. The analysis of hematologic and biochemical blood parameters provides important information on environmental influences on the health status of fish. The hematocrit (HCT) (l/l), hemoglobin concentration (Hb) (g/l), mean corpuscular volume (MCV) (fl), mean corpuscular hemoglobin (MCH) (pg), mean corpuscular hemoglobin concentration (MCHC) (g/l) and red blood cells (RBC) (x1012/L) were analyzed. Animals were grouped into two groups: control (n=10) and experimental (n=16).
 The experimental fish were exposed to 28°C for 30 min. Puncture of the heart was done and the blood without anticoagulant was analyzed. During hyperthermia, an increase in hematological parameters was observed, except for MCV values that were low. Significant differences were established only for the number of erythrocytes and the hematocrit values (p<0.05).
 The results showed a decrease in MCV and an increase in the value of other erythrocyte parameters. Significant changes in the number of erythrocyte and hematocrit values were found. Some hematological parameters such as erythrocyte and MCV values are significant stress indicators and can serve us as important factors for physiological adaptations of fish.
 The carp shows excellent ability to adjust to temperature variations that can be seen through the analysis of hematological status.
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