Guppies are live-bearers and can quickly increase in population; it is recommended to separate males and females to control breeding.

One of seven senior judges for the International Fancy Guppy Association (IFGA) and a best-of-show winner many times over, Carwile has been breeding guppies competitively for more than 20 years ...

Researchers found that it was easy to breed guppies with bigger brains, but the fish had smaller guts and also produced fewer progeny. The results serve as experimental evidence of evolutionary ...