In this study, we cloned and sequenced the complete mitochondrial DNA (mtDNA) of Oncorhynchus mykiss triploid to characterize and compare their mitochondrial genomes. The total length of the mitochondrial genome is 16,656 bp with an accession number KP085590. The organization of the mitochondrial genomes was similar to those reported from other fish mitochondrial genomes containing 37 genes (13 protein-coding genes, 2 ribosomal RNA, and 22 transfer RNAs) and a major non-coding control region. Except for ND6 and 8 tRNAs, all other genes are encoded on the heavy strand. The nucleotide skewness for the coding strands of O. mykiss triploid (AT-skew = -0.41, GC-skew = 0.34) is biased toward T and G. The complete mitogenome may provide important date set for the study of genetic mechanism of O. mykiss.
Keywords: Base composition; Oncorhynchus mykiss; mitogenome; organization.