Project description:The complete mitochondrial genome of gilbert's irish lord (Hemilepidotus gilberti), a fish belonging to family Cottidae, was sequenced for the first time. This complete mitochondrial genome was 16,907 nucleotides in length, consisting of 38 mitochondrial genes (13 protein-coding genes, 22 tRNA genes, 2 rRNA genes, and a control region). The order of these genes was similar to that of other teleosts. The overall A, C, G, and T nucleotide contents in mitogenome were 26.8%, 30.4%, 17.0%, and 25.8%, respectively. The A?+?T content (52.6%) was higher than the G?+?C content (47.4%). NJ phylogenetic analysis was performed for 10 related species within the family of Cottidae along with, two fish species belonging to another family (Sebastidae).