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| Figure 3. Effect of dose of trenbolone acetate (TA) and 17a-methyldihydrotestosterone (MDHT) on masculinization of Oreochromis niloticus fry. Fish were immersed for 3 h at a density of 33 fish l-1 on 13 and 14 days post-fertilization. Graph depicts the percentage of males in each treatment with samples sizes of 15 to 49 for (a) and 45 and 48 for (b). Statistically significant differences from controls are represented by asterisks (* P < 0.05; ** P< 0.01; *** P < 0.001). |