Fishes in first order stream in Ivaí River drainage basin, upper Paraná River Basin, Paraná state, Brazil

Itiz Stream is a first order tributary of the Ivaí River basin, located in a rural area of Marialva municipality, Paraná state. Fish were sampled in October, November and December 2007, September 2008 and March 2009, using electrofishing and a sieve technique in three stretches along the stream. We collected 20 species belonging to 13 genera, seven families and three orders. Only Poecilia reticulata was considered non-native species and five are probably undescribed