Male
In the male, the testes are a pair of white elongated bodies lying just below the air bladder to which they are joined by a thin sheet of tissue, the mesentery. They fuse together toward the posterior end, and the sperm are passed to the outside through the urogenital opening.
Female
In the female, the ovary lies between the intestine and the air bladder. It is an epithlial sac filled with eggs. The posterior end of the ovary is tapered, and the eggs pass to the outside through the urogenital opening just behing the anus. The ovaries are paired in early stages, as they are in other vertebrates, but during development, they fuse into a single organ.
Refer to Figure 1 to help you identify these structures.