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