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The aim of this study was to analyze the conditions of oxygenation of the river Capivari the year 1997 to 2012 and their influences on the aquatic life of that. Methodologies of qualitative and quantitative nature allied to the preferred search properties of documents, were applied in addition to ratings derived from the author himself, as conditions for aquatic life in lotic water bodies. Sampling was conducted on the water quality of the county Capivary South, the Fundação Estadual de Proteção Ambiental, a fixed depth of 0.2 m monitoring station. Through this study it was concluded that 92.2 % of aquatic life Capivari River has been preserved as a function of dissolved oxygen during the sixteen years engaged in the study. Degradations of aquatic life were found on the body of water in the summer of the years 2001, 2005 and 2012 and fall in 2002 and 2007. Low levels of dissolved oxygen found in these periods are explained, mainly, by the increase of water temperature, high rates of degradation of organic matter and the presence of processes involving nitrification. As can be concluded that from 1997 to 2012, the river Capivari nearby municipality Capivary do Sul, showed in general good quality of oxygenation and preservation of aquatic life due to the oxygenation parameter.

SÉRIE HISTÓRICA (1997-2012) DAS CONDIÇÕES DE OXIGENAÇÃO DO RIO CAPIVARI (RS) E SUAS INFLUÊNCIAS SOBRE A PROTEÇÃO DA VIDA AQUÁTICA DO RECURSO HÍDRICO