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The first find of Balon's ruffe (Gymnocephalus baloni) in the river Drava in Slovenia and in Croatia

In March 1986, Balon's ruffe (Gymnnocephalus baloni Holčik & Hensel, 1974), was first captured in the River Drava (Danube basin) in Croatia near Varaždin. In September 1990 it was first captured in the same river in Slovenia near Ptuj, 27 km from the Croatian border. This is the south-western most part of its distribution range in Europe.

Balon's ruffe; first record; river Drava; Danube basin

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