[The introduction of the larvivorous fish Poecilia reticulata (Peters, 1895) (Cyprinodontiformes: Poeciliidae), a bioregulator of culicids in oxidation ponds and contaminated drainage ditches on the Isla de la Juventud].

The larvivorous fish Poecilla reticulata, internationally known as mosquito larva bioregulators, was introduced in 2 oxidation ponds and 2 ditches containing polluted waters (sewage) without the presence of other fish species, in Isle of Youth, Cuba, in order to control the larva populations of the Culex quinquefasciatus mosquito Say, 1823 in these its main breeding sites. After 2.5 months, such reservoirs were free of mosquito larvae. The fish settled within one year, reaching enough density to be used in other aquatoria.