A high-quality chromosomal-level genome assembly of Greater Scaup (Aythya marila)

<em>Aythya marila</em> is one of the few species of Anatidae, and the only <em>Aythya</em> to live in the circumpolar. However, there is a relative lack of research on genetics of this species. In this study, we reported and assembled the first high-quality chromosome-level genome assembly of <em>A. marila</em>. This genome was assembled using Nanopore long reads, and errors corrected using Illumina short reads, with a final genome size of 1.14 Gb, scaffold N50 of 85.44 Mb, and contig N50 of 32.46 Mb. 106 contigs were clustered and ordered onto 35 chromosomes based on Hi-C data, covering approximately 98.28% of the genome. BUSCO assessment showed that 97.1% of the highly conserved genes in aves_odb10 were present intact in the genome assembly. In addition, a total of 154.94 Mb of repetitive sequences were identified. 15,953 protein-coding genes were predicted in the genome, and 98.96% of genes were functionally annotated. This genome will be a valuable resource for future genetic diversity and genomics studies of <em>A. marila</em>.