Updating the distribution data of recently introduced freshwater fish in the Guadalquivir River Basin (Spain).
We report new distribution data on four recently introduced species in the Guadalquivir River basin: chameleon cichlid (Australoheros facetus Jenyns, 1842), North American black bullhead (Ameiurus melas Rafinesque, 1820), European catfish (Silurus glanis Linnaeus, 1758) and a minnow species of unknown origin (Phoxinus spp.). A compilation of records is used to update the distribution range of these species. The information collected reinforces the evidence on the establishment and expansion of these non-native species. We recommend new field sampling to identify the dispersal pathways and to clarify their current statuses.