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Research into the ichthyofauna of the Vlasina Lake reservoir in south Serbia,  which is part of the Danube basin, was carried out in 1993, 40 years after  its formation. The results of the research reveal the presence of several  species of fish belonging to the Adriatic and Aegean basin, such as Alburnus  albidus, Rutilus basak, Scardinius graecus and Pachychilon macedonicus. These  findings are of great importance from the aspect of conservation, because the  species Scardinius graecus and Alburnus albidus are on the European list of  endangered fish species. In the latest study of the Vlasina Lake reservoir  ichthyofauna (70 years after its formation), the above-mentioned species were  not found. However, the presence of naturalized populations of two species  from the Adriatic basin were confirmed: Scardinius knezevici and Alburnus  scoranza. These findings represent the first known areal expansion of these  species, which are new to the ichthyofauna of Serbia, from the Adriatic into  the Danube (Black Sea) basin.[Acknowledgments. The present work was supported by the  Ministry of Education and Science of the Republic of Serbia (Projects No.  43002 and 173025).

Scardinius knezevici Bianco & Kottelat, 2005 and Alburnus scoranza Bonaparte, 1845: New species of ichthyofauna of Serbia and the Danube basin