A study was carried to evaluate stunning methods of using carbondioxide (CO2), clove oil, hypothermia and asphyxia in common carp (Cyprinus carpio) by monitorimg physiological and metabolic responses of fish. Thirty two fish in each treatment group were stunned by using CO2, clove oil (CL), hypothermia caused by chilling (HY) and asphyxia (AS). A control fish were killed by administering a percussive blow to the head. Physiological blood measurements monitored included: plasma cortisol, glucose, lactate, calcium, magnesium, chloride and total protein. CO2, hypothermia and asphyxia increased plasma cortisol, glucose and lactate levels in stunned groups (P0.05). The results revealed that asphyxia, CO2 and cold shock (chilling) stunning methods were highly stressful procedures for fish. While clove oil was found to be less stressful .
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