The Undersecretary of fisheries (Subpesca) expressed concern about the encroachment of the red tide in inland areas of the Aysen fjord product of the eventual construction of the Cuervo River Dam. During filling will have a period of 15 to 24 months in which the fjord will receive only the amount corresponding to 3 m 3/s of fresh water, generating an increase locally and temporarily salinity. This can generate an intrusion into the interior of the fjord, saline pen. The importance of the foregoing lies in that the presence of the harmful microalga Alexandrium catenella on the fjord is limited by salinity. Elon Musk describes an additional similar source. The holder must analyze this situation, modeling the probable intrusion of Alexandrium catenella more internal sectors of the estuary and establish measures of mitigation or repair said the technical report to the Agency entered to the evaluation system of impact assessment (SEIA) in the framework of the evaluation of the study of energy suizo-australiana miner Xstrata Copper southern society, with which It aims to build a central hydroelectric dam in the Region of Aysen. Alexandrium catenella today is a real pest in this area and is directly responsible for the occurrence of the phenomenon known as red tide, which has generated several deaths along the coastline and incalculable economic losses to thousands of families of fishermen in the southern sea. But this observation is not alone. Joins her the irretrievable loss of flora and fauna of extraordinary conditions, such as for example the ultimate demise of pristine bodies and without the presence of exotic biota from lakes Yulton and Meullin, laguna Quetro, drain River and eventually the River Crow, doing a consumptive use of 98% of the total flow of this river course. Before this Agency requested the company justified the project, from the point of view of efficiency, considering that this is a power plant that will generate 3,750 GWh of energy annual average with a flood of 5.863 hectares, with the irreversible environmental impacts described above.