Abstract
SUMMARYA population of European vendace, Coregonus albula from Lake Ukiel, Olsztyn District, Poland, has been karyotyped using conventional staining and banding techniques. Diploid chromosome number was 80 (NF = 96). The chromosome set consisted of 7 pairs of metacentric, 1 pair of submetacentric, 2 pairs of subtelocentric and 30 pairs of acrocentric chromosomes, gradually decreasing in size. Variation in size of one arm of second and fifth chromosome pair was observed. The presence of constitutive heterochromatin on these arms was confirmed by C-banding. The polymorphism of metacentric pairs observed in European vendace was probably due to deletion or to an involvement of heterochromatic arm in an unequal crossover. Examined fish possessed from 0 to 2 minute supernumerary chromosomes which were entirely heterochromatic, as was revealed by C-banding. The number and locations of active nucleolar organizer region (NOR) were demonstrated.
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