How long is the pregnancy of guppies fish?

The gestation period of guppies varies depending on the water temperature, with higher temperatures leading to shorter gestation periods. At room temperature (around 72°F or 22°C), the pregnancy usually lasts about 28 days, but it can be as short as 21 days or as long as 35 days. During this time, the female guppy develops a gravid spot, which is a dark coloration near the anal fin that indicates that she is pregnant.