Integrative Taxonomy of Riverine Cyprinids (Genera Henicorhynchus and Labiobarbus) in the Mekong Delta: Morphological and DNA Barcoding Approaches

Main Article Content

Diem-My Thi Bui
Anh-Khoa Tran
Damien Habinshuti
Ngoc-Tran Thi Nguyen
Dac-Dinh Tran
Thuy-Yen Duong

Abstract

Riverine cyprinids, known as "ca linh" in Viet Nam play a vital role in the economic and ecological systems of the Mekong Delta, particularly during the flooding season. These fish include four species from two genera: Labiobarbus (L. leptocheilus and L. siamensis) and Henicorhynchus (H. entmema and H. siamensis). Identifying species within each genus is challenging for non-ichthyologists due to their similar external appearance, particularly at early developmental stages. This study aimed to combine morphological and DNA-based approaches to comprehensively analyze morphological variations and DNA barcoding of riverine cyprinids in the Mekong Delta, Viet Nam. Fish samples were collected along the Mekong River during the flooding seasons. Initially, morphological classification was performed, including the measurement of meristic and morphometric parameters. The results revealed additional morphometric differences between congeneric species. Subsequently, the cytochrome c oxidase subunit I (COI) gene of each species was sequenced. The Kimura 2-parameter (K2P) genetic distances between the two species within each genus, Labiobarbus and Henicorhynchus, were 0.0878±0.0135 and 0.1005±0.123, respectively. Meanwhile, intraspecific genetic distances ranged from 0 to 0.0046. The findings emphasize the importance of integrating traditional morphological taxonomy with molecular methods to overcome challenges in fish species identification.

Article Details

How to Cite
Bui, D.-M. T. ., Tran, A.-K. ., Habinshuti, D. ., Nguyen, N.-T. T. ., Tran, D.-D. ., & Duong, T.-Y. (2025). Integrative Taxonomy of Riverine Cyprinids (Genera Henicorhynchus and Labiobarbus) in the Mekong Delta: Morphological and DNA Barcoding Approaches. Journal of Fisheries and Environment, 49(2), 1–16. https://doi.org/10.34044/j.jfe.2025.49.2.01
Section
Research Article

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