Author: Kullander, 2009
Comments: Collected with electrofishing from rapids in a large stream, 5-10 m wide, to 1 m deep; water turbid and brownish; rocks came from road building; slope of rapids was about 10°. Associated fauna include <i>Crenicichla lepidota</i> (Cichlidae), <i>Ancistrus</i> sp. and <i>Rineloricaria</i> sp. (Loricariidae), <i>Bryconamericus</i> sp. (Characidae), <i>Heptapterus mustelinus</i> and <i>Rhamdia quelen</i>(Heptapteridae).  All other collection sites were small, shallow brown-water streams up to about 3 m wide; varying velocity and transparency; bottom of sand and stones; and, generally absent vegetation, mostly sampled in unfavorable high water conditions in the month of February.  Associated species here were generally typical forest stream species such as species of <i>Astyanax</i> and <i>Bryconamericus</i>, <i>H. mustelinus</i>, <i>Rineloricaria</i> sp., <i>Rhamdia quelen</i>, <i>Oligosarcus paranensis</i> (Characidae), <i>Apareiodon</i> sp., <i>C. lepidota</i>, and <i>Gymnogeophagus cf. caaguazuensis</i> (Cichlidae) (Ref. 80386).