Situacion de Girardinichthys viviparus (especieamenazada) en los Lagos de Chapultepec,Zumpango y Requena

The present study is regarding to Girardillichthys viviparus of Chapultepec Lakes, Zumpango Lagoon and Requena Reservoir. The fishes were captured with rectangular dip net. Were registered temperature, oxygen, conductivity, pH, hardness and alkalinity. G viviparus was absent in Zumpango and Requena, sistems what received residual and wastewaters. In the three Chapultepec Lakes \vas registered G. viviparus, the largest abundance was found in Lago Viejo, wich received water from Rio Hondo.