Guppy fish (Poecilia reticulata) are some of the most breathtaking in the aquarium community. Revered for their stunning coloration and fast breeding rate, guppies are the quintessential domesticated freshwater fish. Many seasoned aquarists liken them to Goldfish, as they are pretty widespread and easy to keep healthy. These fish are sporting gorgeous tailfins filled with color! In most cases, the body is relatively muted.