Genetic and ecological studies of the origin and reproduction about hemi-clonal hybrids that were first found from marine fishes

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Hexagrammos populations including the hemi-clone strains were analyzed with genetic markers. Ecological researches and artificial closs breeding suggested that hemiclonal strains were different from F1 hybrids between pure species and possess certain genetic materials to hemi-clonally reproduce. In addition one or two sets of chromosomes of hemi-clonal strains fused as the Robertson translocation. The clossbreeding experiments suggested that the translocation may be inducing factors of hemiclone reproduction.A hypothesis concerning the longevity of hemiclonal strains was proposed based on these findings. Hemiclone hybrids usually mate with males of paternal ancestors, but the hybrid would possess the same genome composition as the hemiclone origin species if the hybrids mate with males of maternal ancestors. This type produces recombined gametes, so hemiclonal genome can produce renewal genetical diversity. Thus, the longevity of hemiclonal reproduction will be guaranteed.