First karyological analysis of the vermiculate spinefoot, Siganus vermiculatus (Perciformes, Siganidae) from Thailand

Abstract

Standardized karyotype and idiogram of the vermiculate spinefoot, Siganus vermiculatus (Valenciennes, 1835) from Andaman Sea, Southern Thailand were established. The mitotic chromosome preparations were prepared directly from kidney cells of two male and two female fish. The chromosomes were stained by using conventional and Ag-NOR banding techniques. Its diploid chromosome number was 2n=48 and the fundamental number (NF) was 50 in both males and females. The types of chromosomes were 2 large acrocentric, 30 large telocentric, 12 medium telocentric, and 4 small telocentric chromosomes. No strange size chromosomes related to sex were observed. The region adjacent to the telomere of the short arm of chromosome pair 1 showed clearly observable nucleolar organizer regions (NORs). The karyotype formula could be inferred as: (Formula presented.)