Differential C-heterochromatin distribution in two species of freshwater fish, <i>Anabas testudineus </i>(Bloch.) and <i>Puntius sarana </i>(Hamilton.)

265-268Anabas testudineus (2n=46) had the more conserved pattern of its C-heterochromatin distributed mainly in the centromeric region, whereas Puntius sarana (2n=50) exhibited a rather unorthodox pattern, many chromosomes showing interstitial, some telomeric and a few chromosomes showing centromeric C-band localization. Further, lateral asymmetry in distribution of heterochromatin was also noted in two pairs of chromosomes in P. sarana. The possible implications of the differential distribution noted in these two species has been discussed