Many people cannot accurately judge the guppy’s birthing period, leading to the female fish giving birth directly in the main tank. After the fry are born, they are eaten by other large fish, or the guppies become prone to pin-tail disease, and you will gradually notice the number of fry decreasing.
When you notice the female guppy is about to give birth, it usually manifests as the belly becoming increasingly distended, starting to appear droopy, and the vent protruding. At this time, you can use a breeding box to isolate the female fish; she will likely give birth in about 3 days.

Post-Birth Precautions
After the female fish has given birth, do not put her directly back into the main tank, nor should she be kept in the breeding box indefinitely. She must be allowed to recuperate for a few days to recover her strength. If released too early, she is very likely to be chased by other male fish.
If you discover the female guppy starting to hide in the corners of the fish tank, or becoming inactive, these symptoms are also signs of impending birth.
Water Quality and Medication Prevention
You must control the water change in the tank where the fry are born by changing “1/4” of the water in advance. This is because when the female guppy gives birth, the fluids released are prone to infection and carrying bacteria. If you have Methylene Blue or Gentamicin, you can use a moderate amount to avoid unintended cross-infection and “pin-tail” issues.
Providing a Safe Environment
If conditions permit, be sure to place more aquatic plants in the fish tank, as this benefits the breeding and hiding of the fry.
Feeding Methods for Fry
Do not feed the fry until they are more than 3 days old. Feeding frequency should be about 6 – 7 times a day; as they slowly grow up, you can increase the amount of food but should reduce the number of feedings.
These are the techniques and practical tips that can make your guppy breeding fill the tank. If you can’t remember them, you can like and save this post so you can view it whenever you need to in the future.
Original article by KPTer, if reproduced, please cite the source: https://www.kaipet.com/en/explaining-guppy-breeding-techniques-fill-tank


