Seven species are here reported as new for Pampasic lagoon: Parauchenipterus striatulus, Callichthys callichthys, Otocinclus amoldi and Pimelodus clarins meculatus for Chascomús; Serrasalmus spilopleura, Ageneiosus valenciennesi for San Lorenzo and Brevoortis pectinata for Barrancas. Together with some recent references, these amplies a 10% of increase for the ichthyofauna of the Salado basin.