2b-RAD sequencing of the black rockfish Sebastes schlegelii

The black rockfish Sebastes schlegelii is an important fishery species in Japan, South Korea and China. In recent years, overfishing has decimated the natural resources of S. schlegelii, and the implementation of programs aimed at enhancing fish stock has been initiated. However, the genetic structure of northern populations remains elusive, posing challenges in the collection and preservation of germplasm resources. In this study, in total of 191 S. schlegelii individuals from seven populations including one cultured population (Changdao: CDYZ) and six wild populations (Liangyungang: LYG; Qingdao: QD; Weihai: WH; Changdao: CDYS; Beidaihe: BDH) sequenced by 2b-RAD method and their population genetics was analyzed using 27,064 SNPs obtained. The results indicated that the genetic diversity of the wild and cultured populations were all low (PIC 1). This study provides a theoretical basis for the conservation and rational utilization of germplasm resources for S. schlegelii.