ANGELINI, Ronaldo; AGOSTINHO, Angelo Antonio. Parameter estimates for fishes of the Upper Paraná River Floodplain and Itaipu Reservoir (Brazil). NAGA, WorldFish Center Newsletter, Penang, Malaysia, v.28, no.1&2, p.53-57, 2005.Estimates of the growth (K), natural mortality (M), consumption/biomass (Q/B) rate and trophic level (TL) for 35 species in the upper Paraná river floodplain and the Itaipu reservoir (interconnected ecosystems) are presented. A compilation of these biological statistics is made for comparison purposes and some general trends are briefl y discussed.