Invasion characteristics of Pterygoplichthys ambrosettii (Holmberg, 1893) in the lower Paranapanema River, Brazil.

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.