Scientific article The present study makes the first report of the presence of Corbicula fluminea in aquaculture systems of the Mala Basin, also, it is detailed some highlighting characters for easy recognition. Fifty specimens were collected from an irrigation ditch of the Mala River in Lima. Measurements of temperature and pH were taken, as well as some conicometric variables. Some characteristics of the visceral mass were taken into account for its determination. Initially, the descriptive statistics of the variables were obtained and a chart of frequencies of the valvar length was made, considered as size, the normality of the variables was verified by a Q-Q plot, ratified by the Kolmogorov-Smirnov test. Finally, Pearson correlations were made. An average of 1.57 cm was found for the valve length, the maximum size was 2.50 cm. The highest proportion of individuals was found in the range of 1.50 cm to 2 cm, and the age of the population was estimated at least one year. C. fluminea revealed a high positive correlation among all its variables (p <0.0001). C. fluminea is characterized by conspicuous concentric ribs, both the inhalation siphon and the exhalation are bordered by a dark coloration of pigments, differs from Corbicula largillierti in its bathymetric distribution. The temperature found provides the appropriate conditions for the reproduction of C. fluminea. It is presumed that the localized individuals represent a satellite population, dispersed by the El Niño phenomenon.