Figure 4.

Karyotypes of the silver arowana Osteoglossum bicirrhosum (A,B), black arowana Osteoglossum ferreirai (C,D), Asian arowana Scleropages formosus (E,F); northern saratoga Scleropages jardinii (G,H) and southern saratoga Scleropages leichardti (I,J) arranged from chromosomes labeled with 5S rDNA (red) and 18S rDNA (green) probes after a dual-color FISH (A,C,E,G,I) and after CMA₃/DAPI staining (B,D,F,H,J). In boxes, the different forms of the 18th chromosome pairs of Asian arowana with their heteromorphic 18S rDNA sites and CMA₃⁺ signals. Bar = 5 µm.