[Triploidy in hybrids of carp with other representatives of the Cyprinidae family].

As a result of remote hybridization of carp (Cyprinus carpio L.) with the representatives of certain other subfamilies of Cyprinidae a few viable F1 hybrids were obtained for the first time. These hybrids proved to be allotriploids. In the cross Cyprinus carpio L. female X Hemiculter eigenmanni (Jord. et Metz.) male the rate of survival of this year's brood was 0,5% of the fertilized eggs and 3n=128; whereas in the cross Cyprinus carpio L. male X Ctenopharyngodon idella (val.) female the rate of survival was 0,008%, while the chromosome number (3n) varied from 124 to 128. The chromosome number of non-viable E1 hybrids derived from this cross was intermediate (2n=76). The diploidization of the maternal chromosome set was spontaneous, since no stimulating agents were used to induce it. It is assumed by the authors that it is the tetraploid nature of carp that affords the possibility of the initiation of allotriploids.