Sample and DNA extraction
A single female fish (~800 g) was collected in November 2019 from Heilong River, the northeastern part of China. Muscle, eye, gonad, gill, liver, and spleen tissues were collected and stored in liquid nitrogen until DNA and RNA extraction. Muscle tissues were used for DNA sequencing for genome assembly, while all tissues were used for transcriptome sequencing. Genomic DNA from the white muscle tissue was extracted using the standard phenol/chloroform extraction method to construct the DNA sequencing library. The integrity and concentration of the genomic DNA molecules were checked using 1% agarose gel electrophoresis and Pultton DNA/Protein Analyzer (Plextech, USA).