Credit: Ismael Radwan (Egypt)
The male hormone (17 alpha- methyl testosterone) is dissolved in alcohol at the dose of 60 milligram per 500 ml of alcohol and then after the alcohol containing hormone is to be mixed with one kg of fry feed. Treated feed is dried in shade and could be stored in freezer until used. This one kg of treated feed will be sufficient to sex reverse 5000 fry of Nile tilapia, Oreochromis niloticus for a 3-week treatment. One of the photos shows the mixing of hormone with feed while the second photo shows the shade drying of treated feed. One may notice that the person who handles the treated feed through mixing the hormone or spreading the treated feed is using gloves for health protection.