A small, chiefly freshwater, carplike American fish that has internal fertilization and gives birth to live young. Many livebearers, including the guppy, swordtail, mollies, platyfish, and gambusias, are very popular in aquariums.
- Family Poeciliidae: many genera and species.
- Examples include the oscar, Jack Dempsey, jewelfish, convict cichlid, Midas cichlid, and spotted tilapia; and livebearers, such as swordtails, platies and mollies, and armored catfishes.
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