Easy Description Lebistes reticulatus or Poecilia reticulata , the guppy, has been bred into dozens of colors and varieties. They keep on changing the Latin name. Just like goldfish and koi, the guppy is a show fish. Wild guppies are nothing to jump up and down about. Females are just a brownish gray.
Males have some spots of red, blue, etc.
Some can be rather pretty. Native to parts of Central and South America, the native guppy is also called the Millions Fish. This is because it breeds so well. Most guppies stay at about 1-1.5 inches long but they can grow to 2.5 inches. Guppies do chase each other and other fish but generally do no harm.