The complete mitochondrial genome was sequenced in two individuals of the Kamchatka grayling Thymallus mertensii. The genome sequences are 16 662 bp in size, and the gene arrangement, composition, and size are very similar to the salmonid fish genomes published previously. The low level of sequence divergence (0.92%) detected between the genome of T. mertensii and the GenBank complete mitochondrial genomes of the Arctic grayling T. arcticus (FJ872559) may likely be due to recent divergence of the species and/or historical hybridization and interspecific replacement of mtDNA.
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