Gene map of the Acheilognathus barbatulus mitochondrial genomes. The genome contained two rRNA genes (in yellow), 13 coding genes (in black), 22 tRNA genes (in red) and a control region (D-loop) (in brown). The outer ring corresponds to the H- (outermost) and L-strands and depicts the location of PCGs (except for ND6 which is encoded in the L-strand and is portrayed in red). The inner ring (black sliding window) denotes GC content along the genome.