We report the whole mitochondrial genome of the Brycon orbignyanus, commonly known as the piracanjuba. The mitogenome was determined to be a circular, 16,800 bp DNA molecule, containing 13 protein-coding genes (PCGs), 2 rRNA genes, 22 tRNA genes and one 1160 bp noncoding control region. Twelve of the PCGs were located on the heavy strand, and one PCG (Nd6) was located on the light strand. The most common start codon was ATG; however, the Cox1 gene displayed the GTG start codon. Seven PCGs had incomplete stop codons: specifically, Cox2, Cox3, Nd3, Nd4, and Cytb contained the T- - codon, and Nd2 and Atp6 contained the TA- codon. The Cox1 gene contained the AGG stop codon.
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The migratory species Piaractus Mesopotamicus, popularly known as the pacu, was determined to have a complete mitochondrial genome of 16,722 bp with 45% GC content. The genome contained 13 protein-coding genes (PCGs), 2 rRNA genes, 22 tRNA genes, and a 1048 bp Control Region (D-loop). Almost all the PCGs used the standard ATG start codon, except for Cox1 that used a GTG start codon. Five of the 13 PCGs had a TAA stop codon, two had the incomplete stop codon TA- (Atp6 and Cox3), and five had the incomplete stop codon T-- (Nd2, Cox2, Nd3, Nd4, and Cytb). AGG was the stop codon of Cox1.
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