Impressive miniature fish in aquariums
In aquariums, guppies are therefore always kept in groups, with far more females than males. If a female indicates that she is willing to mate, the male swims up to her and inserts his sperm directly into the female’s copulatory opening via a small, thickened groove in his anal fin. This is known as internal insemination and leads to an exciting characteristic seen in guppies: they are live-bearers. As this name infers, rather than laying eggs, female guppies give birth to live fish.