The distribution and abundance of the Neogobius fishes in their native range (Bulgaria) with notes on the non-native range in the Danube River

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Authors	POLAČIK Matej JANÁČ Michal TRICHKOVA T. VASSILEV M. KECKEIS H. JURAJDA Pavel
Year of publication	2008
Type	Article in Periodical
Magazine / Source	Archiv für Hydrobiologie (Large Rivers)
MU Faculty or unit	Faculty of Science
Citation
Field	Ecology
Keywords	Neogobius fishes; Danube River
Description	The recent distribution and abundances of the genus Neogobius were studied (using electrofishing and beach seining) within (Bulgaria) and outside (Austria, Slovakia, Croatia) its native range along the longitudinal profile of the Danube River in 2004, 2005 and 2006. The presence of four Neogobius species - N. kessleri, N. fluviatilis N. melanostomus, and N. gymnotrachelus was confirmed in Bulgaria and Croatia. In general, the Neogobius spp. showed the lowest density within their native range (6 individuals per 100 m shoreline) while their densities were considerably larger outside their native range (18 - 28 individuals per 100 m shoreline). In addition, N. kessleri and N. melanostomus were significantly larger at sites of non-native distribution compared to native sites.
Related projects:	Ichtyoparazitology - the center of basic research