Guppy fish are fresh water fish that were discovered Trinidad in 1866. They were found by a man named Robert John Lechmere Guppy, but some people in Germany stated they had found it before him. That statement has not been proved right or wrong to this day. Their scientific name is Poecilia reticulata, because they are part of the Poeciliidae fish family. They were later introduced to different parts of the world, because they ate the larvae of mosquitoes, and helped stop the spread of malaria.
A man named Dr. Ab in the mid sixties observed that if you give a guppy quality food, water and care, the guppy grew in size. Then he realized if he somehow does the same thing to the fins then the fins will grow in size. After doing this he created what is know as the fancy guppy, the common guppy nowadays. Other breeders with the same information created different shapes of fins and colors.