Chromosome Karyotype analysis of Erythroculter ilishaeformis

Metaphases of Erythroculter ilishaeformis were prepared directly from kidney cells in vivo. Chromosome number in all counted complete metaphases of Carassius auratus var. Dongtingking is 48. Analysis of chromosome can be divided into four sections according to the position of the centromere. It is metacentric chromosome, submetacentric chromosome, subtelocentric chromosome, telocentric chromos- ome.There are 18 metacentric chromosomes, 10 submetacentric chromosomes, 18subteocentric chromosomes and 2 telocentric chromosomes. Each homologous chromosomes group containned three complete metched homologous chromosomes. These results suggest that Erythroculter ilishaeformis is a double Carassius auratus with a chromosome number of 2n=48. The karyo formula is 2n=18m+10sm+18st+2t ,NF=38.