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Cytogenetic studies of fish species Horabagrus nigricollaris, Puntius denisonii and Puntius sarana subnasutus endemic to the Western Ghats



Cytogenetic studies of fish species Horabagrus nigricollaris, Puntius denisonii and Puntius sarana subnasutus endemic to the Western Ghats



Nucleus Calcuttadecember; 47(3): 143-148



Cytogenetic studies have been undertaken in three endemic fish species of the Western Ghats viz., Horabagrus nigricollaris, Puntius denisonii and Puntius sarana subnasutus by conventional karyotyping and nucleolus organizer regions (NOR) banding. Among them Horabagrus nigricollaris, Puntius denisonii have been reported to be endangered species. In H. nigricollaris the diploid chromosome number was 60 with CF = 26m+20sm+10st+4t (FN=106). Both P. denisonii and P. sarana subnasutus possessed similar diploid chromosome number 2n= 50, however, interspecies variation in karyomorphology was noticed, with chromosome formula (CF) 4m+20sm+18st+8t (FN=74) and 12m+26sm+8st+4t (FN=88), respectively. Ag-NOR staining revealed presence of NORs on 3rd metacentric chromosome in H. nigricollaris, while in P. denisonii and P. sarana subnasutus NORs were localized terminally on 4 pairs of chromosomes, with inter-species variation in their position. In P. denisonii the Ag-NORs were found on 1st submetacentric and 1st, 4th and 7th subtelocentric chromosomes, while in P. sarana subnasutus 4th, 8th, 9th submetacentric chromosome and 1st subtelocentric chromosomes exhibited Ag-NORs terminally.

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