CHROMOSOME BANDING STUDIES OF NOEMACHEILUS-BARBATULUS (LINNAEUS, 1758) FROM POLAND

The karyotype of stoneloach, Noemacheilus barbatulus from Utrata river was studied by-conventional Giemsa staining, Ag-NOR technique and C-b anding. The diploid chromosome number 2n = 50, was composed of 4 pairs of metacentric, 10 pairs of submetacentric and 11 pairs of subtelo- t o acrocentric chromosomes (NF = 78). The NORs bearing chromosomes were from the biggest metacentric pair and they were-located on terminal p osition. This region was also positive for C-banding. The massive hete rochromatin block was also localized on the arms, on one side of centr omer, on the second pair of metacentric chromosomes. Almost all other biarmed and uniarmed elements of chromosome set had C-positive heteroc hromatin in the centromers. Most of the species studied from subfamily Noemacheilinae had diploid chromosomes number 2n = 50. In comparison with the fish from subfamily Cobitidinae a lack of interpopulation chr omosomal variability was observed. The results of karyotype of Noemach eilus barbatulus in comparison with the previously conducted studies a re thus suggesting karyological stability.