Simple Summary: This study analyzed the genetic diversity and structure of thirteen wild populations of the Pacific oyster (Crassostrea gigas) collected from Korea. The findings revealed overall low genetic diversity across populations and suggested that all populations belonged to a single genetic group. Based on these results, potential reference populations were identified for future selective breeding programs aimed at improving the genetic diversity of C. gigas in Korea. This research provides valuable baseline information to support sustainable oyster breeding strategies. This study investigated the genetic diversity and structure of thirteen wild populations of Crassostrea gigas in Korea. The purpose of this investigation was to provide foundational data for selecting reference populations to enhance genetic diversity. Overall, the genetic diversity of Korean C. gigas was relatively low. Analysis using AMOVA, genetic differentiation, and DAPC revealed a genetic structure that was consistent with one group. This study identified reference populations to be used for selective breeding to increase the genetic diversity of Korean C. gigas and provided essential data on genetic diversity and structure for future selective breeding efforts in C. gigas. [ABSTRACT FROM AUTHOR]

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