[The genetic structure of the European goldfish Carassius auratus s. lato (Cyprinidae) in Ukrainian water bodies: an analysis of bisexual samples].

Biochemical gene mapping of goldfish populations in the middle Dnieper basin demonstrated that 8 out of 17 studied enzyme and protein systems are uncoded by duplicated loci and two of them represent isoloci. Noteworthily, the heterozygosity in the studied goldfish samples was significantly higher than the average for bony fish (Hexp = 0.128, 0.135). Cytometric analysis of the samples demonstrated that one of them includes about 20% of presumably triploid females that, nevertheless, did not demonstrate a common electrophoretic pattern of the polymorphic loci, which is typical for unisexual parthenogenetic forms. Moreover, no additional gene applications (constant heterozygotes), unique alleles (diagnostic patterns), or stable manifestation of a gene dose effect were revealed in the polyploid females. Several hypotheses were proposed to explain such unusual structure of triploid parthenogenetic individuals.