When guppies breed, the proportion of female fish will account for two-thirds, while the proportion of male fish is only one-third. As to why there are more female guppies, many people think that it is the water temperature. Generally, the higher the temperature, the greater the possibility of giving birth to male fish, and the lower the temperature, the greater the possibility of giving birth to female fish. However, there are also cases where the temperature is higher and the number of breeding female fish is more.

Because guppies are oviparous and fertilized in vivo, we can't accurately control whether they give birth to male or female fish. If breeders want guppies to have more male fish, they can raise the water temperature as much as possible. When they breed, they can keep the water temperature above 26 ℃ all the time.

guppies are oviparous, and their reproductive sex is as difficult to control as human beings. At present, it is impossible to accurately control the sex of guppy by artificial means. There are only some methods to make them more likely to have male fish. The more common way is to raise the water temperature. When guppies breed, raise the water temperature to above 26 ℃, so that they may breed more male fish. However, it does not mean that the number of male fish bred when the water temperature is high must be large, but the probability of breeding male fish will be greater.