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This study aimed at investigating the potential role of β-glucan in improving the immunity, anti-inflammatory and histopathology disorders induced by chlorpyrifos in Nile tilapia. Fish were allocated in four group where the control fed the basal diet without chlorpyrifos toxicity and chlorpyrifos group fed the basal diet and subjected to chlorpyrifos (15 μg/L water). The third group fed dietary β-glucan (1 g/kg diet) without chlorpyrifos toxicity and the fourth group fed dietary β-glucan and exposed to chlorpyrifos (β-glucan/chlorpyrifos). Results revealed that the exposure to chlorpyrifos tended to decrease final body weight (FBW), weight gain (WG), specific growth rate (SGR), and survival but increased the feed intake (FI) and feed conversion ratio (FCR). Administration of β-glucan tended to increase FBW, WG, SGR, survival, and FI but did not change the FCR. Exposure to chlorpyrifos did not change the blood alkaline …