Effects of 2-phenoxyethanol anaesthesia on haematological profile on common carp (Cyprinus carpio) and rainbow trout (Oncorhynchus mykiss)

The aim of this study was to assess changes in haematological profile of common carp (Cyprinus carpio) and rainbow trout (Oncorhynchus mykiss) after the exposure to anaesthetic 2-phenoxyethanol. The haematological profile was assessed before, immediately after 10 min of anaesthesia and 24 h after the anaesthesia with recommended concentration of 0.30 ml center dot l(-1) 2-phenoxyethanol. The 10-min exposure to 2-phenoxyethanol of common carp caused the significant increase (p < 0.01) in the haematocrit value and relative and actual count of monocytes immediately after the anaesthesia. These values returned back to normal within 24 hours. In rainbow trout, 2-phenoxyethanol anaesthesia had no effect on the haematological profile. Results of the examinations suggest that the use of 2-phenoxyethanol at the concentration of 0.30 ml center dot l(-1) does not cause irreversible damage of the blood in common carp and rainbow trout.