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Differential staining with Giemsa, CMA and DAPI was compared in 2 forms of Anabas testudineus (non-spotted and spotted form). The somatic chromosome number of these forms was determined as 2n=46. The range of chromosomal length of non-spotted form and spotted form was 1.86–5.33 μm and 1.60–5.32 μm, respectively. It indicates the gradual decrease in chromosome length of both the forms. The centromeric formulae were 14 m+32 t in non-spotted form and 6 m+40 t in spotted form. More telocentric chromosomes are present in spotted form, thus it is relatively advanced. Facultative heterochromatins were found in the spotted form, it was absent in non-spotted 1. Only one CMA-band was found in non-spotted form, whereas 4 CMA-bands present in the spotted form. Absence of CMA-positive band in a member of pair VI indicates a small deletion of GC-rich repeats in the non-spotted form. The percentage of GC-rich repeats is much more in spotted form. Neither DAPI positive nor negative band could be detected in any form. Since 2 forms possessed distinct centromeric formulae and CMA-banded karyotypes, they could be characterized authentically in these methods. The karyotypic features suggest for placing the 2 forms in at least different taxonomic variety.

Comparative Karyotype Analysis with Differential Staining in Two Forms of Anabas testudineus Bloch