Fancy guppies are guppies that have been bred in captivity for bright color and long fins. Ideal guppies have long, wide tail fins that match the dorsal fins in color and pattern. Male guppies have brighter colors and longer fins than females.
Guppies are native to freshwater streams and pools in northeastern South America and the Caribbean but are kept in aquariums worldwide. They are fairly easy to breed and are bred into many strains distinguished by color and fin shape. The International Fancy Guppy Association sanctions shows, develops judging standards, trains judges and provides education on breeding and raising quality show guppies.