The results show that the F 2 hybridy is the allodiploid fish and has the chromosome numbers of 100 and the karyotype of 22m+34sm+22st+22t,NF=156; the F 3 hybrid is the allotetraploid fish and has the chromosome numbers of 200 and the karyotype of 44m+68sm+44st+44t, NF=312.
为证明红鲫×湘江野鲤杂交后代由异源二倍体转变为异源四倍体发生于F2 与F3代之间提供了直接证据。