Abstract
This is the first report on karyo-morphological details and characteristic of nucleolar organizer regions (NORs) of Sundaic yellow catfish, Hemibagrus capitulum (Siluriformes, Siluridae), from Sirindhorn Peat Swamp Forest, Narathiwat Province, Thailand.The mitotic chromosome preparations were prepared from kidney cells of ten male and eight female specimens. Conventional staining and Ag-NOR banding techniques were applied to stain the chromosomes. The results showed that the diploid chromosome number of H. capitulum was 2n = 56 and the fundamental number of both sexes was 108. The karyotype consists of 2 large metacentric, 8 large submetacentric, 2 large acrocentric, 18 medium metacentric, 12 medium submetacentric, 6 medium acrocentric, 4 medium telocentric, and 4 small metacentric chromosomes. None of strange size chromosomes related to sex was found. In addition, the telomeric NORs were clearly observed in the short arm of the submetacentric chromosome pair 16. The karyotype formula for H. capitulum is as follows: 2n = 56 = L2m + L8sm + L2a + M18m + M12sm + M6a + M4t + S4m.
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