The investigation was carried out in the Aricota lagoon, located in the Tacna region. The environmental impact generated by the raising of trout fingerlings, which is carried out in an artisanal way in floating cages, was evaluated through the Rapid Impact Assessment Matrix methodology (RIAM). The physical, biological and socio-economic components that are affected were identified. The physical, chemical and microbiological parameters and metals were also determined by Inductively Coupled Plasma Mass Spectrometry in a certified laboratory. The results indicate that the negative environmental impacts are classified as moderate negative impact, as the water quality of the lagoon does not show signs of organic or biological contamination. However, when analyzing the total metals, high values of arsenic were found (0.672 ± 0. 0056 mg/L), and boron (8.78 ± 0.2687 mg/L) compared to those est...