김태섭, et al. J Korean Orthop Assoc. 2024 Apr;59(2):90-100. https://doi.org/10.4055/jkoa.2024.59.2.90

Since the early 1990s in South Korea, climatic and anthropogenic factors have incurred the reduction of the wild seeds of the Pacific oyster, Crassostrea gigas , which raised concerns about losing genetic diversity and accelerating genetic deterioration. We assessed the genetic diversity of C. gigas populations from two farms (Tongyeong and Gadeokdo) on the southern coast, where about 80% of the cultivated oysters in Korea are produced. Tongyeong showed slightly higher diversity than Gadeokdo, but both populations had a similar genetic structure characterized by low nucleotide diversity. Comparative haplotype analyses provided data supporting genetic features of the populations that include (1) weak genotype-locality relationship, (2) low levels of gene flow between populations, and (3) possible seasonal fluctuation of genetic variation within a population. Furthermore, the highly alike haplotype network patterns were observed between the wild and farm populations as well as among the populations in neighboring countries, which suggests that the genetic structure is conserved between wild and hatchery populations, and geographic proximity has minimal influence on the genetic composition.

박진영, et al. J Korean Orthop Assoc. 2023 Apr;58(2):115-123. https://doi.org/10.4055/jkoa.2023.58.2.115

South Korea is among the major producers of the Pacific oyster, Magallana gigas ( Crassostrea gigas ), which is one of the most valued aquaculture species. Since the early 1990s, climatic and anthropogenic factors have incurred the reduction of their wild seeds, whereby the dependence on hatchery-produced seeds has constantly increased in South Korea, thus raising concerns about losing genetic diversity and accelerating genetic deterioration. To better understand their genetic make-up, we assessed the genetic diversity of M . gigas populations from two farms (Tongyeong and Gadeokdo) in the southern coast, where about 80% of the cultivated oysters in Korea are produced. Tongyeong showed slightly higher diversity than Gadeokdo, but both populations had a similar genetic structure characterized by low nucleotide diversity. Comparative haplotype analyses provided data supporting unique genetic features of the populations that include (1) weak genotype-locality relationship, (2) low levels of gene flow between populations, and (3) seasonal fluctuation of genetic variation within a population. Furthermore, the highly alike haplotype network patterns were observed between the wild and farm populations as well as among the populations in neighboring countries, which suggests that the genetic structure is conserved between wild and hatchery populations, and geographic proximity has minimal influence on the genetic composition. These results warrant further study in biological and ecological contexts and will be invaluable in formulating genetic monitoring and sustainable long-term management of M. gigas .

Jinho Lee, Jin-Young Park, Hong-Keun Park, Tae-sup Kim. KJSM 2023;41:201-6. https://doi.org/10.5763/kjsm.2023.41.4.201