Rio Capivari is a river system located in the state of São Paulo, Brazil, flowing through a region characterized by significant altitudinal variation that directly shapes the fish communities and fishing experiences found throughout its length. The upper reaches of the river are defined by narrower, higher-elevation watercourses that tend to be in better ecological condition, while the lower, wider sections support a broader and more diverse assemblage of fish species. This gradient from headwaters to lowland river creates a dynamic and ecologically rich fishery that rewards anglers who understand how altitude, river width, and habitat quality influence where different species are found.