The goldfish (Carassius auratus gibelio Bloch.) were exposed to cadmium in the concentration of 20 mg Cd/1 water under aquarium conditions for 1, 4, 7 and 15 days. After exposure to cadmium, the activities of superoxide dismutase (SOD) and catalase (CAT) were significantly decreased. At the same time, the liver ascorbic acid (AsA) content was increased.