Published Paper Details:

Karyological characters of Schizothorax richardsonii in Kosi River in ,Uttrakhand (India) were studied by examining metaphase chromosome spreads from the kidney tissues.The examination of 80 metaphases spread prepared from 20 fingerling specimens indicated that the chromosome numbers of this species was found 2n=92 and the arm number was determined as NF=122. The prepared karyotype of this species consisted of 9 pairs of metacentric (m), 14 pairs submetacentric (sm) and 25 pairs subtelocentric (st) chromosomes. The chromosome formula can be stated as 2n = 9m + 14sm + 25st.Karyological parameters showed that centromeric index, arm ratio, relative length and so length variation range of chromosomes of the fish were between 25.00 - 49.24, 1.03 - 3.55, 0.88 - 4.13 and 14.57 - 67.70 respectively and total length of chromosome was 1639.16?m. The largest chromosome in this species was a pair of the submetacentric chromosome. The sex chromosomes were cytologically indistinguishable.With respect to the number of chromosomes and resistant of this fish to the environmental conditions, it seems to be tetra ploid origin fish.