Abstract
Yellowfin seabream is an important economic fish that is widely distributed in the East and South China seas. Many attempts to enhance stocks of yellowfin seabream have occurred in China, but a lack of genetic information for this species after stock release represents an obstacle to its management and conservation. To provide scientific guidance for sustainable germplasm resource development, we sequence the mitochondrial DNA (mtDNA) control region (CR) of 123 yellowfin seabream from 6 sample populations (Xiamen, Dongshan I, Dongshan II, Yangjiang, Fangchenggang, and Beibu Gulf). Populations of both wild and cultured yellowfin seabream have high genetic diversity, which we relate to their breeding habits and growth rate. A neighbor-joining tree of CR haplotypes reveals no specific phylogenetic structure corresponding to location of fish capture. Both neutral test and nucleotide mismatch distribution analyses suggest that yellowfin seabream have experienced population expansion events. Pleistocene glacial periods and recent stock releases have played important roles in the formation of present-day phylogeographical patterns. Our study provides baseline information which will assist future research on genetic structure, genetic diversity, and historical demography of yellowfin seabream after stock release in southeast China coastal waters. The use of exotic seeds should be avoided in stock breeding and release, and relevant follow-up surveys and genetic monitoring should be undertaken to clarify the genetic impact of exotic seed use on wild populations.
Highlights
Genetic diversity, the diversity of genes (Frankham et al 2010), forms the basis of species survival and evolution (Huang et al 2019) and is an important component of biodiversity (Jiang et al 1997; Norse et al 1986)
The mitochondrial DNA (mtDNA) control region (CR) is a non-coding sequence region which is subject to less natural selection pressure and has a faster mutation and evolution rate than other mtDNA coding sequences (Xiao et al 2000); it has been widely used in marine fish genetic diversity research (Zhou et al 2019; Huang et al 2019)
In October wild individuals were collected from Xiamen (XM), Dongshan I (DS I), and Fangchenggang (FC), and in November cultured individuals were collected from Dongshan II (DS II) and wild individuals from Yangjiang (YJ) and Beibu Gulf (BB) (Fig. 1, Table 1)
Summary
The diversity of genes (Frankham et al 2010), forms the basis of species survival and evolution (Huang et al 2019) and is an important component of biodiversity (Jiang et al 1997; Norse et al 1986). Understanding genetic diversity assists with the study of fish evolutionary history, spatial distribution, and population historical demography (Huang et al 2019; Zhou et al 2019; Li. 2015), and provides reference opinions for the rational utilization and sustainable development of species germplasm resources (Pimm et al 2014; Ward 2000). The mtDNA control region (CR) is a non-coding sequence region which is subject to less natural selection pressure and has a faster mutation and evolution rate than other mtDNA coding sequences (Xiao et al 2000); it has been widely used in marine fish genetic diversity research (Zhou et al 2019; Huang et al 2019)
Sign-in/Register to view highlights & summary 
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call