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| Figure 3. Percent males at harvest of Nile tilapia fry immersed in MT at 50 or 100 mg l-1 and MDHT or TBA at 100 or 250 mg l-1 with or without ultrasound (us). The control was treated without ultrasound and without hormone but immersed in 5% ethanol solution. Treatments with different letter superscripts indicate mean values that are significantly different (P < 0.05). |