A chromosome-level whole genome of Red mahseer (Tor sinensis)

Genomic resources for Tor species are currently limited, and their molecular systematics remain poorly resolved. In this study, we report the first chromosome-level genome assembly of Tor sinensis, generated using PacBio long-read sequencing and Hi-C scaffolding. The final genome assembly spans approximately 1.80 Gb and consists of 228 contigs, with a contig N50 of 31.67 Mb. A total of 97 contigs were successfully anchored and ordered into 50 chromosomes, covering 96.57% of the genome. Chromosome lengths range from 23.67 Mb to 62.88 Mb. Repeat analysis identified 807.40 Mb of repetitive sequences, representing 44.84% of the genome. In addition, 3,794 rRNA genes and 11,264 tRNA genes were annotated, along with 379 snRNAs and 35 snoRNAs. The average length of tRNA genes was 72 bp. A total of 62,000 protein-coding genes were predicted, yielding 263,453 protein sequences. This high-quality reference genome provides a valuable foundation for future studies and facilitate comparative genomic analyses across the Tor genus and support biodiversity conservation efforts in the Lancang-Mekong River basin.