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The guppy (Poecilia reticulata), also commonly known as guppie, is one of the most popular freshwater aquarium fish species in the world. It is a small member of the Poecilidae family (females 4 centimetres long, males 2½–3 centimetres long) and like all other members of the family, is live-bearing. It prefers a hard water aquarium and can withstand levels of salinity up to 150% sea water (58 ppt sodium chloride)[1], which has led to them being occasionally included in marine tropical community tanks, as well as in freshwater tropical tanks. Its most famous characteristic is its propensity for breeding, and it can breed in both fresh water and marine aquariums[2]

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