Gambusia Affinis

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The mosquitofish is a species of freshwater fish, also commonly if ambiguously known by its generic name, gambusia.

It is sometimes called the Western mosquitofish, to distinguish it from the eastern mosquitofish (G. holbrooki). It is a member of the family Poeciliidae of order Cyprinodontiformes.

The genus name gambusia is derived from the Cuban Spanish term gambusino, meaning useless.These fish are native to the watershed of the Gulf of Mexico, where they feed readily on the aquatic larval and pupal stages of mosquitoes.