Comparative karyological studies on Chinese carps.
50 Giemsa-stained chromosome sets were examined for each of 3 species: grass carp (Ctenopharyngodon idella), bighead carp (Aristichthys nobilis) and silver carp (Hypophthalmichthys molitrix). The modal value for the diploid chromosome number was 48 for all 3 species. The grass and bighead carp both had 10 pairs of metacentrics, 8 pairs of submetacentrics and 6 pairs of telocentrics. The silver carp had 11 metacentric, 7 submetacentric and 6 telocentric pairs. For each chromosome, data are tabulated on the lengths of the long and short arms, arm ratio and total length. Total chromosome length was 59.15, 73.91 and 71.7 mu in the 3 species resp. (NF = 84 in each). For the F1 hybrid between C. idella and A. nobilis, the diploid chromosome number was 72 (NF = 126). There were 15 metacentric, 12 submetacentric and 9 telocentric pairs.