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In this study, the dietary effect of garlic powder (GP) as an herbal supplement on the growth performance, digestive enzymes, innate immunity, and antioxidant capacity of narrow-clawed crayfish, Postantacus leptodactylus, was investigated. In a 90-day feeding trial, the crayfish (N = 360; 25.90 ± 0.41 g initial weight) were fed with a basal diet (control; GP-free) and supplemented diets with three levels of GP (0.5%, 1%, and 2%). The highest final weight and specific growth rate were obtained in the crayfish fed with GP at 1% and 2% (P