16S rRNA revealed a low rate of maternal genetic variations in Cyprinus carpio Linnaeus, 1758 across the southern Caspian Sea

Genetic diversity Haplotype diversity mtDNA Population Restocking

Authors

January 22, 2025

Genetic diversity surveys are informative and practical tools in aquaculture and restocking programs. With its maternal inheritance, mtDNA provides direct information about the available source of genetic variations in the female brood stock. The present study investigated the maternal genetic diversity of the Caspian common carp, Cyprinus carpio, and the farmed common carp across the southern Caspian Sea using direct sequencing of 571 bp fragment of 16S rRNA. A number of eight haplotypes were identified, with an average of Hd = 0.55. A low level of population differentiation was recognized with the overall Fst = 0.01, indicating an assumption of the shared ancestry in C. carpio in the southern Caspian Sea. Among different regions, Anzali population was observed to be a more unique stock of common carp across the southern Caspian Sea basin. Hence, considering Anzali as a separate population is highly recommended to enrich the genetic diversity and avoid the population structure breakdown in C. carpio. The obtained results during the present study can be useful in the ongoing restocking activities of C. carpio along the southern Caspian Sea. Furthermore, rehabilitation of the main rivers to provide the natural breeding of anadromous fish species such as C. carpio should be considered for their future conservation.