Fish were fed diets containing dehydrated ginger powder (GgP) to determine its effects on growth, immune response, antioxidant capacity and resistance to Aeromonas hydrophila infection. 540 Nile tilapia were distributed in 36 250 L aquaria and fed six isonitrogenous and isoenergic diets supplemented with six graded levels of GpP: 0, 2.5, 5, 7.5, 10 and 15 g/kg, during 30 days. After that, growth, hemato‐immunological parameters and antioxidant enzymes activities were determined. All parameters, but growth, were re‐evaluated after the bacterial infection challenge. Fish fed diets up to 5 GgP showed higher body weight and specific growth rate compared with 0 GgP. Fish fed 10 GgP showed the highest H₂O₂ and NO compared with 0 GgP (p < .05). Fish fed 2.5 GgP and 10 GgP maintained catalase and superoxide dismutase activities after infection. The highest survival was observed for fish fed 10 GgP. The best results for specific growth rate and feed conversion ratio were determined at 4.1 and 5.8 g/kg of GgP and for survival rate and immunological response at 10 g/kg of GgP. In sum, 10 g/kg GgP is indicated to improve Nile tilapia growth performance and resistance against Aeromonas hydrophila infection.

中文翻译：

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生姜粉可改善生长性能和免疫反应，但对感染嗜水气单胞菌的尼罗罗非鱼的抗氧化能力有限

用含有脱水姜粉（GgP）的饲料饲喂鱼，以确定其对生长，免疫反应，抗氧化能力和对嗜水气单胞菌感染的抵抗力。在36 250 L的水族箱中分布了540尼罗罗非鱼，并在30天内喂食了六种等氮和等能量的日粮，并补充了六种分级的GpP：0、2.5、5、7.5、10和15 g / kg。之后，确定生长，血液免疫参数和抗氧化酶活性。挑战细菌感染后，重新评估除生长以外的所有参数。与0 GgP相比，以5 GgP为食的鱼饲料显示出更高的体重和比生长率。饲喂10 GgP的鱼显示出最高的H ₂ O ₂和NO，而0 GgP（p <.05）。喂食2.5 GgP和10 GgP的鱼在感染后仍保持过氧化氢酶和超氧化物歧化酶活性。饲喂10 GgP的鱼的存活率最高。确定特定生长速率和饲料转化率的最佳结果分别为4.1和5.8 g / kg GgP，以及成活率和免疫应答为10 g / kg GgP时。总之，表明10 g / kg GgP可以改善尼罗罗非鱼的生长性能和对嗜水气单胞菌感染的抵抗力。