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Prepared in this experiment were six groups of diets, i.e. VC0, VC1, VC2, VC3, VC4 and VC5 with the contents of vitamin C (VC mg(100 g) -1 diet) of 0, 100, 200, 400, 800, and 1200 respectively. It was found that vitamin C increased the concentrations of immunoglobulin-like (IgG-like, IgA-like and IgM-like) substances in the serum of Penaeus chinensis after a feeding period of 3 weeks. The differences among groups were significant (P<0.01), but there was no diffe- rence in the contents of complement3-like and complement4-like substances in the serum (P>0.05). Phenoloxidase (PO) activity in the serum of VC3 group shrimps was higher than that of VC0 and other groups, but no significant difference was observed between VC0 group and other groups. Furthermore, bactericidal activity of the serum to Vibrio parahaemolyticus in shrimps fed with the VC1 diet was higher than that in the other groups (P<0.01), while no difference was demonstrated among all groups for the bactericidal activity to Vibrio alginolyticus (P>0.05). It is, therefore, suggested that vitamin C (100-400 mg(100 g) -1 diets) could be used as an immunostimulant of P. chinensis.
Prepared in this experiment were six groups of diets ie VC0, VC1, VC2, VC3, VC4 and VC5 with the contents of vitamin C (VC mg (100 g) -1 diet) of 0, 100, 200, 400, 800, It was found that vitamin C increased the concentrations of immunoglobulin-like (IgG-like, IgA-like and IgM-like) substances in the serum of Penaeus chinensis after a feeding period of 3 weeks. The differences among groups were significant (P <0.01), but there was no diffe- rence in the contents of complement3-like and complement4-like substances in the serum (P> 0.05). Phenoloxidase (PO) activity in the serum of VC3 group shrimps was higher than that of VC0 and other groups, but no significant difference was observed between VC0 group and other groups. However, the bactericidal activity of the serum to Vibrio parahaemolyticus in shrimps fed with the VC1 diet was higher than that in the other groups (P <0.01) while no difference was seen among all groups for the bactericidal activity to It is, therefore, suggested that vitamin C (100-400 mg (100 g) -1 diets) could be used as an immunostimulant of P. chinensis. Vibrio alginolyticus (P> 0.05)