The gestation period of guppies is influenced by water temperature, individual differences, and environmental factors, typically ranging from 21 to 40 days. Here is a detailed analysis:
1. Regular Gestation Periods
In most cases: The average gestation period is 22-30 days. When the water temperature is maintained at 25-28°C, the period may shorten to 22-26 days.
First-time mothers: Female guppies pregnant for the first time have a longer gestation period, approximately 28-32 days, which may be related to their sexual maturity.
Extreme conditions: Low temperatures in winter (e.g., water temperature below 22°C) can prolong the period to more than 35 days, while high temperatures in summer may shorten it to around 21 days.
2. Signs of Impending Birth
In the late stages of pregnancy, the delivery time can be predicted through the following characteristics:
Abdominal changes: The abdomen becomes swollen and square-shaped, and in some cases, the fry inside can even be seen through the transparent skin.
Color of the gravid spot: The black or orange-red gravid spot at the junction of the abdomen and tail darkens.
Abnormal behavior: The mother fish may become restless or hide, and its swimming posture may be unbalanced.
3. Influencing Factors
Water temperature: Around 26°C is the ideal temperature; temperatures that are too high or too low can alter the gestation period.
Nutrition and health: Female fish with weaker physical condition may experience delayed delivery.
Breed differences: Some artificially bred varieties (such as Thai Red Diamond) may have slightly shorter gestation periods.
4. Precautions
Timing of isolation: It is recommended to isolate the mother fish around 25 days into the pregnancy to prevent her from eating the fry.
Duration of delivery: The birthing process usually lasts 3-10 hours, requiring close observation.