How To Sex Tilapia
Sexing Tilapia is important, since most farmers wish to cultivate males only. Male Tilapia grows bigger and yields a higher profit for aquacultures. The fish are therefore sexed as early as possible, and the females are destroyed. manual sexing of Tilapia is tricky and requires specially trained personnel. Even those with experience will normally get at least two to five percent wrong, when sexing Tilapia.
When a Tilapia fingerling has reached a weight of one ounce, it can normally be sexed by looking at the genital paella. The genital papilla i located right behind the anus of the fish. If the genital paella has one single opening, you are looking at a male Tilapia. Males have only one opening, and both urine and milt will pass through this hole. If the genital papilla has two openings, you are looking at a female Tilapia, because Tilapia eggs pass through a separate opening from the urine. If you find it hard to examine the genital paella of the fingerlings, try placing a drop of dye, such a food coloring or methylene blue, on the genial region. The color will normally make it easier to distinguish the openings.
*This information is courtesy of the Aquatic Community*