2017 年 82 巻 1 号 p. 59-65
We report the first chromosome analysis in the ocellated dragonet (Synchiropus ocellatus) and picturesque dragonet (S. picturatus) from Thailand. Kidney cell samples were taken from five male and five female fishes. The mitotic chromosome preparation was prepared directly from kidney cells. Conventional and Ag-NOR staining techniques were applied to stain the chromosomes. The results showed that the diploid chromosome number of S. ocellatus and S. picturatus were 2n=40, and the fundamental number (NF) was 40 in both males and females. The chromosomes were present as large telocentric, medium telocentric and small telocentric chromosomes in numbers of 16–18–6 and 14–24–2, respectively. No morphological difference was identified between sex chromosomes of male and female specimens. After Ag-NOR banding technique, a single pair of nucleolar organizer regions (NORs) was observed on the long arm centromeric region of large telocentric chromosome pair 5 in S. ocellatus and chromosome pair 4 in S. picturatus. The karyotype formulas could be deduced as:
