On the occurrence of three non-native cichlid species including the first record of a feral population of Pelmatolapia ( Tilapia ) mariae (Boulenger, 1899) in Europe

Thermally influenced freshwater systems provide suitable conditions for non-native species of tropical and subtropical origin to survive and form proliferating populations beyond their native ranges. In Germany, non-native convict cichlids ( Amatitlania nigrofasciata ) and tilapia ( Oreochromis sp.) have established populations in the Gillbach, a small stream that receives warm water discharge from a local power plant. Here, we report on the...