It is best for guppies to be isolated about 20 days after pregnancy, because they are oviparous fish, and it takes about 28-32 days from successful mating to production, so it is better to isolate them when they are pregnant for 20 days. First of all, they are not close to giving birth after about 20 days of pregnancy, so they can adapt well to the newly acquired environment. Although they have low requirements for the environment and strong adaptability, they are very sensitive to environmental changes after pregnancy, so isolation is the most appropriate around 20 days of pregnancy.

As mentioned above, guppies are oviparous, so they reproduce differently from other fish. When guppies mature, they will pair themselves. After successful pairing, the male fish will put their genitals into the drainage holes of the female fish, and then discharge sperm. At this time, the eggs in the mother fish will become fertilized eggs, and the fertilized eggs will develop in the mother. Fish eggs are not born until they mature in the body, so guppies produce small fish, not eggs.

Because guppies produce small larvae, they need more physical strength when they produce. Breeders need to isolate their parents immediately after guppy production, and ensure that their food and nutrition are sufficient, so that they can recover their physical strength as much as possible. In addition, guppy is prone to dystocia during production, so breeders need to keep the environment stable, quiet and comfortable, so as to avoid dystocia.