Guppy (Poecilia Reticulata):

Species Size Temparature Range pH Range dH Range Enviorment Origin
Fancy 1.5 inchs (male), 2 inches (female)

68°F-85°F

6.8-8.0 0°-15°

Freshwater. Note: They can't tolerate strong water currents because of their large tails. The use of some aquarium salt is recommended.

Breed from the wild guppy.
Wild 1 inch (male), 1.5 inches (female) 70°F-90°F 6.0-8.0 0°-20° Freshwater. Note: The use of some aquarium salt is recommended. Central and South America

There are hundreds of different strains of guppies. Reliant Aquatics at the moment have only a few strains listed.
See Listed Strains.