The armored catfish Loricariichthys platymetopon was recently caught by the first time in the middle region of river Paranapanema. It has quickly become one of the most abundant species. This study evaluated reproductive aspects of 1,044 specimens collected in the Capivara reservoir. Abundance, sex ratio, RGS, IAR and oocyte diameter were evaluated. Sites far away from the dam showed higher abundances than the one next to it. Breeding occurred when temperature was higher, with moderate intensity. Mean absolute fecundity and mean relative fecundity were 663.95 ± 141.99 oocytes and 4.9 ± 1.24 oocytes.gr-1 respectively. Spawning occurred in batches. Mean diameter of mature oocytes was 3.67 mm.
Neotropical; Upper Rio Paraná; armored catfish; reproduction; fecundity
