Abstract:An eight-month feeding experiment was conducted to determine the impact of dietary vitamin C on the reproductive performance of turbot Scophthalmus maximus.The basal diet was supplemented with 0,800 and 4 800 mg/kg vitamin C to formulate three experimental diets.Results showed that the growth of turbot broodstock was improved with the increasing dietary vitamin C, but no significant difference was observed between control and vitamin C supplementation treatments.The egg production of female broodstock fed vitamin C supplemented diets was significantly (P<0.05) higher than those fed the basal diet.The gonadosomatic index (GSI),number of spawns,percentage of buoyant egg,fertilization rate and hatching rate of 800 mg/kg and 4 800 mg/kg treatments were significantly higher with the increase of vitamin C addition in diets(P<0.05). Vitamin C concentrations in eggs reflected dietary vitamin C addition.The egg diameter and oil globule diameter of turbot broodstock was improved with the increasing dietary vitamin C,but no significant difference was observed between control and vitamin C supplementation treatments.With the increase of dietary vitamin C, the activities of superoxide ismutase (SOD) in tissues were significantly reduced (P<0.05),but malonaldehyde (MDA) contents were significantly increased (P<0.05).So,it is concluded that vitamin C supplement in the diets can improve the reproductive performance of turbot broodstock.
