Abstract
SUMMARYKaryotype of European leuciscine cyprinid species Aspius aspius from various river basins of Europe have been described. It consists of 7 pairs of metacentric, 14 pairs of submetacentric and 4 pairs of subtelocentric to acrocentric chromosomes including the «marker» leuciscine subtelocentric pair. According to its morphology, the karyotype is substantially the same as found in many other species of European leuciscine cyprinids. The only significant and remarkable difference is the localization of nucleolar organizer regions (NORs) as visualized by both silver staining and C-banding. Contrary to other species of European leuciscins, chromosomal NORs are located on the longer arms of the smallest pair of acrocentrics. This finding as well as the intraspecific karyotype variability of A. aspius has been discussed on the basis of our data as well as previous reports.
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