Michał Nowak

Range expansion of an invasive alien species, Chinese sleeper, Perccottus glenii Dybowski, 1877 (Teleostei: Odontobutidae) in the Vistula River drainage

In October 2007 an invasive alien species, the Chinese sleeper, Perccottus glenii Dybowski, 1877 (known also as the Amur sleeper), was recorded in carp ponds in Krakow-Mydlniki (southern part of Vistula River drainage). As far as we know, this is the uppermost site in the Polish part of the Vistula River drainage. Thirty-six individuals of P. glenii were collected during fishery works. Basic morphometric measurements were obtained, following the commonly accepted procedures, in order to describe the general body shape of P. glenii.

NEW DATA REGARDING THE DISTRIBUTION AND ICHTHYOCOENOLOGICAL AFFINITIES OF THE UKRAINIAN BROOK LAMPREY, LAMPETRA (EUDONTOMYZON) MARIAE (CEPHALASPIDOMORPHI: PETROMYZONTIFORMES: PETROMYZONTIDAE), IN SOUTHERN POLAND

Fifteen new localities of the Ukrainian brook lamprey, Lampetra (Eudontomyzon) mariae, were found within 2008-2010. The majority of them are located in the Nida River drainage. Additionally, the occurrence of that species in the Strwiąz River, a tributary of the Dniester, was confirmed. The cluster analysis performed sug- gests, that L. mariae exhibits strong affinity to the stone loach, Barbatula barbatula, and the Eurasian minnow, Phoxinus phoxinus. We believe that the distribution of L. mariae on the territory of Poland seems to be strongly underestimated.