Abstract
Our recent faunistic surveys revealed some new exotic crayfish, fish and amphibian species recorded for the first time from the River Danube, as well as from several streams and warm water ponds located at public areas in Budapest. The most important discovered species are the red swamp crayfish (Procambarus clarcii (sic) Girard, 1852) originating from North America, several fish species belonging to different families (Callichthyidae, Cichlidae, Cyprinidae, Doradidae, Poecilidae) and originating from Africa, Asia, Central and South America, and the African dwarf frog (Hymenochirus curtipes Noble, 1924). All these species are presumably released by aquarists into the warm‐water ponds and by the floods into the Danube river system. An adult southern striped raphael (Platydoras armatulus Valenciennes, 1840) and armoured catfish (Megalechis thoracata Valenciennes, 1840) were caught in the water system of the River Danube after the record flood in 2013. Several individuals of blue streak hap (Labidochromis caeruleus Fryer 1956) and doctor fish (Garra rufa Heckel, 1843) were found in the Lake Városliget. Furthermore, adults, subadults and juveniles of convict cichlid (Amatitlania nigrofasciata Günther, 1867), molly (Poecilia sp.) and swordtail (Xiphophorus sp.) appeared in all major urban warm‐water ponds in Budapest. Consequently, we presume that these fish species are not only surviving but also breeding in these water bodies.
Keywords: pet trade • stocking • thermal water • Danube
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