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Mekong tiger perch ( Datnioides undecimradiatus ) is an ornamental and vulnerable freshwater fish native to the Mekong basin in Indochina, belonging to the order Lobotiformes. Here, we generated 121X stLFR co-barcode clean reads and 18X Oxford Nanopore MinION reads and obtained a 595 Mb Mekong tiger perch genome, which is the first whole genome sequence in the order Lobotiformes. Based on this genome, the phylogenetic tree analysis suggested that Lobotiformes is more closely related to Sciaenidae than to Tetraodontiformes, resolving a long-time dispute. We depicted the genes involved in pigment development in Mekong tiger perch and results confirmed that the four rate-limiting genes of pigment synthesis had been retained after fish-specific genome duplication. We also estimated the demographic history of Mekong tiger perch, which showed that the effective population size suffered a continuous reduction possibly related to the contraction of immune-related genes. Our study provided a reference genome resource for the Lobotiformes, as well as insights into the phylogenetic position of Lobotiformes and biological conservation.

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The genome of Mekong tiger perch (Datnioides undecimradiatus) provides insights into the phylogenetic position of Lobotiformes and biological conservation