Tetra1990 said:Can you post a picture?
http://freshaquarium.about.com/cs/livebearers1/a/livebearingfish.htmIt is easy to determine the sex of most livebearers by noting the differences in the anal fin. The female has a fan shaped anal fin, while the male has a rod shaped anal fin. The modified anal fin in the male is known as the gonopodium, and is used to inseminate the female. Females are able to store sperm cells from the male, and can produce several broods of young from a single insemination. The gestational period is about four weeks for most livebearing species.