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A 240-day feeding trial was conducted to investigate the effects of dietary vitamin C on growth performance,anti-oxidative response,and fatty acid composition of juvenile abalone Haliotis discus hannai Ino (initial body weight: 0.93±0.00 g).Three semi-purified experimental diets were formulated containing 0.00,94.52,and 9 649.58 mg/kg of vitamin C supplied as L-ascorbyl-2-monophosphate.The results show that there was no significant difference in weight gain ratio,daily increment in shell length,and survival rate among the three treatments.Adding dietary vitamin C (9 649.58 mg/kg) significantly increased the activities of superoxide dismutase (SOD),glutathine peroxidase (GPX),glitathione-S-transferase (GST),glutathione reductase (GR),alkaline phosphatase (AKP),and lysozyme in viscera (P＜0.05).In muscle,activities of phenoloxidase,catalase,SOD,GST,GR,and AKP were increased in the treatment with 9 649.58 mg/kg of dietary vitamin C (P＜0.05).The highest concentrations of ascorbic acid in viscera and muscle were found in the group with 9 649.58 mg/kg of dietary vitamin C (P＜0.05).The contents of crude protein and crude lipid in the soft body were significantly increased in the 9 649.58 mg/kg group (P＜0.05).Dietary vitamin C supplementation significantly decreased the contents of saturated fatty acids (14∶0,16∶0,and 18∶0),and increased the composition of 18∶2n-6 and 22∶6n-3 in the soft body of abalone (P＜0.05).Therefore,although there were no significant effects on the growth performance,dietary vitamin C supplementation improved the anti-oxidation and immune responses,increased specific unsaturated fatty acid (i.e.,16∶1,18∶1n-7,18∶ 1n-9,18∶2n-6 and 22∶6n-3),and decreased specific saturated fatty acid (i.e.,14∶0,16∶0 and 18∶0) contents in the soft body of abalone.