First Cytogenetic Study of the Whitecheek Monocle Bream, Scolopsis vosmeri (Perciformes, Nemipteridae) from Thailand

The first chromosome analysis of the whitecheek monocle bream (Scolopsis vosmeri Bloch, 1792) from the Gulf of Thailand, was studied. Kidney cell samples were taken from two male and two female fish. The mitotic chromosome preparations were done 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. vosmeri was 2n=48, the fundamental numbers (NF) were 50 in both male and female. The types of chromosomes were 2 large acrocentric, 30 large telocentric, 14 medium telocentric, and 2 small telocentric chromosomes. The Ag-NOR banding indicated that a single pair of NORs was observed on the short arm subtelomeric region of the largest acrocentric chromosome pair 1. The karyotype formula could be deduced as: