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| Figure 1. Effect of dietary treatment with 17a-methyltestosterone (MT) on masculinization of Oreochromis niloticus fry in tanks with soil, gravel, or no soil. Fish were fed either a control diet or a diet containing 60 mg kg-1 of MT. Graph depicts the percentage of males in each treatment with sample sizes indicated in parentheses. Statistically significant differences from controls are represented by asterisks (* P < 0.05; *** P < 0.001). |