![]() The genomic polymorphism and genetic diversity were revealed using a panel of single-nucleotide polymorphisms (SNPs) in wild and captive populations of Arapaima gigas through ddRAD sequencing. (2019) analyzed the genetic diversity and population structure of the endemic carp Ancherythroculter nigrocauda in the upper Yangtze River utilizing the mitochondrial cytochrome b gene and SSRs (simple sequence repeats). In fish, genetic diversity analysis also provides important data for the conservation and rational utilization of fish germplasm resources and the healthy development of aquaculture. Genetic diversity research has provided important theoretical guidance for resource assessment and conservation in various species, including mammals, birds, and plants. Understanding populations’ genetic structure is beneficial to developing targeted conservation measures and realizing species’ recovery potential. Population genetic diversity is the basis of biodiversity and also a measure of the evolutionary potential of species. nasus to provide data references for its conservation and resource utilization. ![]() Therefore, it is necessary to explore the population genetic characteristics of C. However, assessment of the wild and farmed population structure and diversity is limited. The artificial breeding and culture of C. nasus is prohibited and the consumption demand for C. Recently, with the implementation of the national policies of the Yangtze River Protection Law and the Ten-Year Fishing Ban in the Yangtze River, the wild catch of C. nasus has been listed on the IUCN Red List of Threatened Species. Its reproductive rate and body size have also declined. Meanwhile, continuous high-intensity fishing has also led to a sharp drop in its catch, from 3750 tons in 1973 to 12 tons in 2012. nasus habitat destruction since the 1970s. However, changes in hydrological conditions, such as river–lake isolation and water quality deterioration, have led to C. nasus was once abundant and one of the most important fish resources in the Yangtze River. nasus.Ĭoilia nasus is a migratory fish species with high nutritional and economic value and naturally inhabits the middle and lower reaches of the Yangtze River and offshore China. This study provides a theoretical basis for the conservation and rational exploitation of germplasm resources for C. nasus, suggesting that conservation of its resources is of great urgency. In conclusion, this study revealed that genetic diversity reduction and germplasm resource degradation had occurred in both wild and farmed C. It is speculated that the river–lake isolation of Yezhi Lake is the main cause of this phenomenon. Different amounts of gene flow were identified among WH, ZJ, and PY populations, but gene flow among YZ and other populations was low. Population genetic structure analyses indicated that the four populations may have come from two ancestral groups. The results indicate that both the wild and farmed populations had low genetic diversity, and germplasm resources have undergone varying degrees of degradation. nasus were analyzed using 44,718 SNPs obtained via 2b-RAD sequencing. ![]() ![]() nasus and the status of germplasm resources in the Yangtze River, the genetic diversity and structure of two wild populations (Yezhi Lake: YZ Poyang Lake: PY) and two farmed populations (Zhenjiang: ZJ Wuhan: WH) of C. To reveal the genetic diversity of natural and farmed populations of C. In conclusion, the present study provides a reference for germplasm conservation and breeding strategy optimization in Coilia nasus, and contributes to the healthy development of Coilia nasus aquaculture.Ĭoilia nasus is a threatened migratory species in the Yangtze River Basin. The aim of this study was to assess the germplasm resources of Coilia nasus by analyzing the genetic diversity and genetic structure of its natural and farmed populations. Artificial farming has gradually become an important way to protect and utilize the germplasm resources of Coilia nasus, but limited germplasm sources and unscientific breeding strategies have put the germplasm resources and genetic diversity of Coilia nasus at risk, which limits its resources protection and utilization. Since the 1970s, the continuous deterioration of the habitat environment and continuous high-intensity fishing have led to a sharp decline in the germplasm resources of the Coilia nasus, which has been listed in the Red List of Threatened Species by the International Union for Conservation of Nature. Coilia nasus is a migratory fish species with high nutritional and economic value, and naturally inhabits the middle and lower reaches of the Yangtze River and offshore China. ![]()
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