Standardized Karyotype and Idiogram of Quoy's Parrotfish, Scarus quoyi (Perciformes: Scaridae) by Conventional Staining and Ag-NOR Banding Techniques

抄録

This is the first report on standardized karyotype and idiogram analyses of Quoy's parrotfish, Scarus quoyi, from the Andaman Sea, Southern Thailand. Kidney cell samples were taken from three male and three female fish. Mitotic chromosome preparations were prepared directly from kidney cells. Conventional staining and Ag-NOR banding techniques were applied to stain the chromosomes. The results showed that the diploid chromosome number of Sc. quoyi was 2n=48, and the fundamental number (NF) was 74 in both males and females. The types of chromosomes were 4 large metacentric, 4 large submetacentric, 16 large acrocentric, 18 large telocentric, 2 medium acrocentric, 2 medium telocentric, and 2 small telocentric chromosomes. There were no irregularly sized chromosomes related to sex. The region adjacent to the short arm near the telomere of acrocentric chromosome pair 6 showed clearly observable nucleolar organizer regions/NORs. The karyotype formula for Sc. quoyi is as follows:
2n (diploid) 48=L₄^m+L₄^sm+L₁₆^a+L₁₈^t+M₂^a+M₂^t+S₂^t