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Anesthetics are widely used in fish farming. Their purpose is to reduce the mobility and stress of fishes due to manipulation. In the present study we tested the efficiency of clove oil (Eugenia caryophyllata) in different doses [4.70 mL anesthetic/50 liter of water (0.094 mL/Lwater); 2.36 mL anesthetic/50 liter of water (0.0472 mL/Lwater); 1.82 mL anesthetic/50 liter of water (0.0364 mL/Lwater)] in carp (Cyprinus carpio) and in Prussian carp (Carassius gibelio) with different body mass. Anesthesia induction times were monitored. At each of these stages the respiratory rate was monitored by recording the opercular movements. The results show a direct correlation between the fish size and the induction times of anesthesia. Regardless of species, larger and heavier specimens require longer periods for anesthesia. Instead, recovery times in larger-body specimens were shorter. Different doses have influenced the duration of anesthesia induction and recovery times, the most effective dose being 4.70 mL/50 liter of water followed by 2.36 mL/50 liter of water. The dose of 1.82 mL/50 liter of water did not induce anesthesia. [ABSTRACT FROM AUTHOR]