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Barberry fruit (BF) has a long history as a folk remedy due to its antimicrobial, anti-inflammatory, antioxidant, and cholagogic properties. This study was performed to determine the dietary effect of BF extract on serum and skin mucus immune parameters, antioxidant status, and stress-selected gene expression in Siberian sturgeon. One hundred and fifty fish (30 ± 1 g initial weight) were fed with different levels of BF extract including 0 (control), 150, 300, 600, and 750 mg kg⁻¹ for 8-week. After the feeding trial, the counts of white blood cells and lymphocytes were increased in BF-added groups compared to the control group (P < 0.05). The highest levels of serum complement component 4, lysozyme activity, and alternative complement were obtained in 750 mg kg⁻¹ BF extract treatment (P < 0.05). The highest activities of protease, alkaline phosphatase, and esterase were obtained in the skin mucus samples of the fish …