Verification of mitotic gynogenesis in ornamental (koi) carp (Cyprinus carpio L.) using microsatellite DNA markers

The Japanese ornamental (koi) carp is a popular decorative fish all over the world. In koi, clones have not yet been obtained, although production of fish with identical colour patterns could be of commercial interest. Mitotic gynogenetic progenies are essential for subsequent production of clones in fish. However, resulting late-shocked progenies may be contaminated with meiotic gynogens from spontaneous suppression of the second meiotic division in eggs. In this study, microsatellite DNA markers were used to confirm mitotic gynogenetic origin of obtained late-shocked progenies. Recombination rate (y) and mapping distance relative to centromere (M-C) of 10 microsatellite loci were determined based on percentage of heterozygotes in meiotic gynogenetic progenies. The range of y varied from 0.01 to 0.96 and the M-C map ranged from 0.5 to 48 cM. The mean value of y over the 10 loci was 0.481. Six loci, which had y 0.47 and higher, were used as markers in two late-shocked gynogenetic progenies. Complete homozygosity was revealed at all six microsatellite loci indicating mitotic gynogenetic origin of analysed progenies.