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This study describes the invasion of the upper Paraná River basin by Pterygoplichthys ambrosettii based on a literature review and field samples. Pterygoplichthys ambrosettii has been reported in 42 localities throughout the upper Paraná River basin, including the Tietê, Paranapanema, Paraná, Grande and Aguapeí rivers. The ascent of P. ambrosettii after the inundation of the Sete Quedas Falls on the Paraná River and the release of individuals by aquarium hobbyists were the primary drivers of this invasion. [ABSTRACT FROM AUTHOR]

The aim of this study is to report the presence of a three non-native hybrid long-whiskered catfishes (family Pimelodidae) in the Upper Paraná River basin, Brazil. Genetic analyses demonstrated that the three presumptive hybrids were a result of the crossbreeding of Pseudoplatystoma reticulatum (central Amazonas River basin and Lower Paraná River) and Leiarius marmoratus (Amazonas, Essequibo and Orinoco rivers), producing a hybrid commonly known in Brazil as cachandiá. The potential threat to biodiversity, due to possible genetic contamination, competition and predation of wild stocks, of such artificially produced hybrid fishes is discussed. [ABSTRACT FROM AUTHOR]

The article offers information on a study which assesses and chracterize the Pterygoplichthys ambrosttii catfish in lower Paranapanema River in Brazil. It states that samples for the study were gathered from February 2010 to October 2011 and that sieves, cast nets and trawl were used for sample collection. Results reveal that fish sex ratios of the species varies through life cycle, growth act and mortality.

Summary The relationship between length and weight are described for 15 fish species in the Capivara Reservoir, Brazil, an impoundment of the rivers Paranapanema, Ashes and Tibagi. The fish community of the reservoir was sampled using a multi-method sampling strategy in 2003 and 2004 to enable the collection of fish samples that were not biased regarding length or weight. For seven of these fishes, the data represent the first description of length-weight data for the species. [ABSTRACT FROM AUTHOR]

The article focuses on the introduction of the armored catfish, Pterygoplichthys ambrosettii in a large effluent of the Upper Parana River basin in Brazil. As stated, there are several routes of introduction of freshwater fishes in Brazil, including deliberately releasing non-native species, the transposition of hydrographic basins, and accidental escapes from fish culture. It states that one of the likely means through which this species reached the region is the process of manual rescue.