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The guppy (Poecilia reticulata), also known as the millionsfish, is one of the most popular freshwater aquarium fish species in the world. It is a small member of the Poecilidae family (females 4-6 centimetres long, males 2½–3½ centimetres long) and like all other members of the family, is live-bearing.

Guppies are highly prolific livebearers. The gestation period of a guppy is 22-30 days, with an average of 28 days. After the female guppy is inseminated, a dark area near the anus, known as the gravid spot, will enlarge and darken. Guppies prefer water temperatures of about 28 °C (82 °F) for reproduction. The female guppy has drops of between 2-200 fry, typically ranging between 30 and 60. After giving birth, the female is ready for conception again within only a few hours.

The guppy has been successfully hybridised with the molly (poecilia latipinna/velifera), eg male guppy and female molly. However, the hybrids are always males and appear to be infertile.
The guppy has also been hybridised with the Endler's livebearer.
The guppy prefers a hard water aquarium and can withstand levels of salinity up to 150% that of normal sea water.[7], which has led to them being occasionally included in marine tropical community tanks, as well as in freshwater tropical tanks. Guppies are generally peaceful, though nipping behaviour is sometimes BLUB.

Experienced aquarists breeding their own guppies are aware that the adults will eat their young and, therefore, provide safe zones for the fry. Specially designed livebearer birthing tanks, which can be suspended inside the aquarium, are available from aquatic retailers. These serve the dual purpose of shielding the pregnant female from further attention from the males, and of providing a separate area for the newborn young as protection from being eaten by their mother. Although if a female is put in the breeder box too early or late it will cause her to have a miscarriage.