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This study was conducted with different levels (0, 0.25, 0.5,1,2 g) of Zingiber officinale powder per 100 g of common carp commercial diet. Feed was offered for 8 weeks by the post pelleting liquid spraying method. Results showed that there were significant differences in all growth parameters and body composition except in survival rate, Gain Weight Percent (GW%) ,SGR and NFE between treatments (p<0.05). Significant differences were also detected in GW % between control group and the last two treatments but there were no significant differences in SGR index between control group and the group fed diets containing 2 g ginger/per100g diet (p<0.05). No significant differences were observed in their length, growth, survival rate as well as NFE (p>0.05). Also, Kruskall-Wallis test found significant difference in the amount of carbohydrate and body fiber (p<0.05). The best results for growth performance, protein, lipid, and energy were found in the group fed maximum dosage of ginger powder in carp commercial diet and lowest values for these parameters were seen in the control group. Additionally, there were high amount of carbohydrate and low amount of fiber in this group. Higher level of ash was reported in the third treatment. We may therefore conclude that using Z. officinale at higher levels can be an efficacious medicine to improve quality and quantity of juvenile Cyprinus carpio growth and muscle.

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This study was conducted to evaluate the effect of aqueous Zingiber officinale extract (ZE) on growth performance, antioxidant activity and resistance of shrimp (Litopenaeus vannamei) challenged with Photobacterium damselae bacteria. A total number of 600 post larvae shrimps (initial weight, 1.06±0.7 g) were randomly distributed into 12 fiberglass tanks representing four treatments each tank containing of 50 shrimp. The control shrimp group (ZE0) was fed a ZE free basal diet. Other groups were fed the basal diet supplemented with 0.5 (ZE 0.5), 1.0 (ZE1) and 1.5 (ZE 1.5) g kg^-1 diet. Diets were offered to shrimp at a feeding rate of 10% of live body weight for 8 weeks. After 8 weeks of experimental trial 30 shrimp from each group was infected with LD70 bacteria P. damselae over 10 days to evaluated disease resistance of infected shrimp. Results revealed that growth performance (WG, SGR, FW and PER), the antioxidant activity (SOD, PO, GPx and CAT) of shrimp have significantly increased and cumulative mortality rate decreased (p<0.05) in the ZE1 group compared with the other groups. Meanwhile, the lowest FCR and MDA value were observed in shrimp fed ZE1 supplemented diet. It can be concluded that Z. officinale extract at the level of 1g kg^-1 (ZE1) diet seems to be the most appropriate level for increasing growth performance, antioxidant activity and disease resistance of L. vannamei.