Abstract
The ecotoxicological evaluation of the upper-middle part of Camana-Majes-Colca Basin, Peru was -1carried out in three sampling points: Capiza, Colca and Majes compared with CuSO (1 mg·L ), 4 which is a toxic standard for the bioindicator microalga Pseudokirchneriella subcapitata. In each sampling point, pH, temperature, conductivity, dissolved oxygen, total suspended solids (TSS), biochemical oxygen demand (BOD), chemical oxygen demand (COD), sulfides, ammoniacal nitrogen, cyanide WAD, free cyanide, nitrates, total phosphorus, total nitrogen, thermo-tolerant coliforms, oils grease and heavy metals were measured. The lowest rate of P. subcapitata growth was in Capiza's sampling Point (0.008) where values of pH, manganese and iron exceeded Peruvian EQS (Environment Quality Standard) for water in category 3. These results show a correlation with high level of significance (P
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