High-quality genome assembly and functional annotation of Hiroshima-derived Pacific oyster Magallana gigas

The Pacific oyster (Magallana gigas) is a widely distributed marine bivalve of major importance in aquaculture and is abundant along the Asian coasts. The Hiroshima Prefecture is the principal region for oyster production in Japan. The currently available reference genomes are derived from oysters of UK origin and do not fully capture the genetic characteristics of the Hiroshima populations. Here, we present a high-quality genome assembly and functional annotation of M. gigas from Hiroshima, Japan. The genome was assembled using PacBio HiFi long reads. After assembly, the contaminant contigs were removed, yielding a final assembly with a total length of 707 Mb, contig N50 of 7.9 Mb, and BUSCO completeness of 99.9 %. Of the 44,639 predicted protein-coding genes identified using GALBA, 43,806 were successfully annotated using a functional annotation workflow (Fanflow). Overall, the high-quality assembly and annotation provide a valuable genomic resource for exploring the genetic diversity and environmental adaptations of Hiroshima oyster populations. The data will facilitate future studies in breeding, functional genomics, and genome editing.