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Guppy

Stocking Fish Tips: Make sure that any new fish you are planning to add to your tank will be compatible with the current inhabitants. You need to look at temperament, water parameters and tank size requirements. For instance, please don’t put a common pleco in anything under 55 gallons.
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The guppy (Poecilia reticulata), also known as the millionfish,[1] is one of the most popular freshwater aquarium fish species in the world. It is a small member of the Poecilidae family (females 4-6 centimetres long, males 2½–3½ centimetres long) and like all other members of the family, is live-bearing.

Robert John Lechmere Guppy discovered this tiny fish in Trinidad in 1866, and the fish was named Girardinus guppii in his honour by Albert C. L. G. Gunther later that year. However, the fish had previously been described in America. Although Girardinus guppii is now considered a junior synonym of Poecilia reticulata, the common name “guppy” still remains. (In Trinidad and Tobago, the common name is “crayfish”.)[2] Over time guppies have been given a variety of taxonomic names, although Poecilia reticulata is the name currently considered to be valid.

Guppies are native to Barbados, Brazil, Guyana, Netherlands Antilles, Trinidad and Tobago, the US Virgin Islands, Venezuela.[3]

However, guppies have been introduced to many different countries on all continents, except Antarctica. Sometimes this has occurred accidentally, but most often as a means of mosquito control, the hope being that the guppies would eat the mosquito larvae slowing down the spread of malaria. In many cases, these guppies have had a negative impact on native fish faunas.[4]