Reproductive success is very important in aquaculture production especially in species that are candidate for future production. As many investigation on fish sperm competitions show males have biased competition, so some functional gene alleles may be lost during mixed-milt fertilization. Major Histocompatibility Complex genes are one of the most important adaptive immune system genomes which should be conserved during artificial spawning. This issue becomes more critical in case of species like common carp (Cyprinuscarpio) that are in risk of inbreeding depression. In this study, analysis of MHC classI gene (UBA locus) was used by polyacrylamidegel electrophoresis (PAGE) in 30 brood stocks and 50 offspring (F1) larvae Results indicated that some genotypes become more frequent and some of them decreased or lost during propagation.it is concluded that these genes can be good candidate for two purposes simultaneously: larvae-parent assignment and genotype-assisted selection. Key words: Cyprinuscarpio, UBA, Parentage assignment, Histocompatibility Complex genes
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