The gestation period of guppies typically ranges from 21 to 40 days, with the exact length influenced by factors such as water temperature, individual differences, and breeding frequency. Here’s a detailed breakdown of the key points:
I. Basic Gestation Duration
Regular Range
In most cases, it lasts 22–28 days (when water temperature is 25–28°C).
First-time mothers may have an extended period of 28–32 days.
In low-temperature winter environments, it can exceed 35 days.
Extreme Cases
High summer temperatures may shorten it to 21 days.
Exceptional individuals may experience an unusually long gestation period of 40 days.
II. Influencing Factors
Water temperature: Around 26°C is ideal; temperatures below 23°C or above 30°C can prolong the period.
Female’s condition: First-time mothers, weak, or elderly fish tend to have longer gestation periods.
Breeding frequency: Females that breed continuously may have shorter gestation periods in subsequent cycles.
III. Signs of Impending Birth
Abdominal Changes
The abdomen shifts from flat → round → square-shaped enlargement.
The gravid spot (black mark near the anus) darkens in color.
Abnormal Behaviors
Reduced appetite and slow swimming.
Hiding in corners or swimming frantically.
IV. Special Considerations
Females can become pregnant again as soon as 1–2 weeks after giving birth.
It’s recommended to allow at least 30 days between each brood to avoid straining the mother’s health.