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Here, we determined the complete mitochondrial genome of a bagrid catfish, Mystus rhegma. The whole mitogenome of M. rhegma was a circular molecule with 16,525 nucleotides, composed of 22 tRNA, 2 rRNA, 13 protein-coding genes, and a non-coding control region. The contents of A, T, C, and G are 30.89%, 26.00%, 27.43%, and 15.68%, respectively. In terms of AT and CG contents, the content of AT is obviously higher than that of CG, 56.89% and 43.11%, respectively. The phylogenetic analysis reveals that M. rhegma has a close relationship with M. mysticetus.

The complete mitochondrial genome of Parabramis pekinensis was determined in this study. It contained 13 protein-coding genes (PCGs), 22 tRNA, two rRNAs, and a control region with the base composition 31.11% A, 27.80% C, 24.81% T, and 16.27% G. Here, we compared this newly determined mitogenome with another one from the same species reported before. The variable sites and the genetic distances between the two mitogenomes were 96 bp and 0.6%. Eight-three variable sites were occurred in the PCGs. The results from the phylogenetic analysis showed that P. pekinensis is close to Megalobrama terminalis.

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