To evaluate haematological and biochemical profiles of blood and histopathological changes in tissues of carp, clove oil concentration of 30 mg/l was used in the present study. Haematological and biochemical profiles of blood can provide important information about the internal environment of the organism (Masopust, 2000). Values determined in the present study suggest that internal organs and tissues of carp are not altered by clove oil anaesthesia. That conclusion was also confirmed by the result of histological examination of parenchymatous organs