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الملخص
Clove oil is a natural anaesthetic that can help to calm stressed fish throughout both biological and therapeutic processes such as artificial spawning. No mortality was recorded among the fish subject to the tests specified in this research whether in the anaesthesia or recovery phase. The reactions of common Carp were recorded for the anaesthesia period with four phases and for the recovery period with three phases where no effects were observed for the concentrations (5, 10 and 20 ppm) in anaesthetizing fingerlings or adult individuals while concentrations (60, 80, 100 and 120 ppm) succeeded in anaesthetizing fingerlings, In addition to a concentration of 40 ppm in anaesthetizing adult individuals. The anaesthesia time for fingerlings ranged from 1.04 minutes at a concentration of 60 ppm for 2.28 minutes at a concentration of 120 ppm. The recovery time ranged from 4.44 minutes at a concentration of 80 ppm for 11.45 minutes at a concentration of 120 ppm, While anaesthesia for adult individuals ranged from 1.03 minutes at a concentration of 40 ppm for 1.45 minutes at a concentration of 120 ppm with recovery periods ranging from 4.21 minutes at a concentration of 40 ppm for 10.18 minutes at a concentration of 120 ppm. The concentration of 80 ppm proved to be better than the rest of the previous concentrations (60, 100 and 120 ppm) for use in anaesthetizing both fingerlings and adult individuals together (P>0.05).