When untreated effluents are released into water bodies, numerous changes are perceived, and it is possible to quantify those using physical and chemical parameters. This study aimed to verify the environmental quality of a section of Barbado Stream in Cuiaba-MT, using as the main parameter dissolved oxygen, determined by gravimetric chemical analysis. As well as additional parameters, specimens were collected and semi-structured interviews with people living around the stream were performed

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... ut their environmental perception. Dissolved oxygen values found were far superior to the expected for an anthropized stream, ranging from 6.42 mg.L -1 to 130.66 mg.L -1 . Identified specimens of fish showed selectivity resulting from pollution and how the relationship of the residents with the stream