Fig. (2).

Male (a) and female (b) karyotypes of Hoplias malabaricus (karyomorph F) under conventional Giemsa staining (left) and C-banding (right). In (c), distinct chromosome pairs no. 1 showing a conspicuous C-positive block in one of the homologues present only in males but not in females, identifying a cryptically Y chromosome and thus an XY sex chromosome system. Scale bar represents 5 µm.