In this study, we conducted analysis of the sequence of nucleotides of the Cytochrome coxidase gene subunit I (COI) gene of the mitochondrial form 45 yellow fin Angelfish are the province of Haiphong, Nha Trang and Vung Tau to identify genetic differences between groups is characterized by short-fin morphologythe median fins and anal fins, and the identification of their scientific name. Results of analysis showed that the gene sequence types 2 characteristic CONSIDERED in total 45 samples conducted an analysis of all three groups of fins are short, medium and long. Comparing the sequences of the genes CONSIDERED showed similar levels of short and medium fin fin group is very high and the difference with the group long fins. COI gene sequences of the oxidized in the median fins and fin group in this study were similar in 99%-100% with yellow fin Angelfish species Trachinotus ovantus, whereas long-group have a high similarity with species of Trachinotus blochii available in the Genbank database. Besides, we also use other specialized software for analysis of genetic distance and subspecies to be able to draw conclusions yellow fin Angelfish groups in Vietnam in two species of Trachinotus blochii Trachinotus and ovantus.Key words: fish, yellow fin, birds SEEN, the species identification
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