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<p>Rays and sharks are increasingly at risk of extinction due to anthropogenic pressures, including industrial fishing, bycatch and habitat degradation, and climate change. Their slow life histories and the challenges associated with accurate species identification further hinder effective conservation efforts. This study investigated the diversity of ray and shark species along the coast of Côte d’Ivoire, with the aim of improving the taxonomic resolution and the accuracy of species identification. We applied a DNA barcoding approach based on two mitochondrial markers: COI (cytochrome c oxidase subunit I) and NADH2 (NADH dehydrogenase subunit 2), to characterize landed elasmobranchs and identify potential species complexes requiring further taxonomic investigation. A total of 220 rays and sharks specimens were collected from 11 landing sites between February 2022 and September 2024. Sequence analyses revealed 32 Barcode Index Numbers (BINs), including 11 not previously reported in the Barcode of Life Data System (BOLD). Several distinct genetic lineages were detected, suggesting the presence of cryptic species, misidentified taxa or potential undescribed species, including <i>Torpedo</i> cf<i>. torpedo, Aetomylaeus</i> cf<i>. bovinus, Gymnura</i> cf<i>. sereti, Raja</i> cf<i>. miraletus,</i> and <i>Squalus</i> cf<i>. blainville</i>. Notably, most of the identified species are listed as threatened on the IUCN Red List. These findings underscore the urgent need for comprehensive taxonomic reassessments and updated conservation evaluations, while highlighting the value of integrating molecular identification tools into national fisheries monitoring and management frameworks.</p>

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DNA barcoding reveals overlooked species diversity in rays and sharks of Côte d’Ivoire

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Aboueut Beatrice Judith Carine Adous,
  • N’Guessan Emmanuel Kouamé,
  • Nicolas Roland Owo,
  • Awa Ndiaye,
  • Philippe Béarez,
  • Fabien Rieuvilleneuve,
  • Segun Olayinka Oladipo,
  • Lotanna Micah Nneji,
  • Béatrice Abouo Adepo-Gourène,
  • Jean-Dominique Durand

摘要

Rays and sharks are increasingly at risk of extinction due to anthropogenic pressures, including industrial fishing, bycatch and habitat degradation, and climate change. Their slow life histories and the challenges associated with accurate species identification further hinder effective conservation efforts. This study investigated the diversity of ray and shark species along the coast of Côte d’Ivoire, with the aim of improving the taxonomic resolution and the accuracy of species identification. We applied a DNA barcoding approach based on two mitochondrial markers: COI (cytochrome c oxidase subunit I) and NADH2 (NADH dehydrogenase subunit 2), to characterize landed elasmobranchs and identify potential species complexes requiring further taxonomic investigation. A total of 220 rays and sharks specimens were collected from 11 landing sites between February 2022 and September 2024. Sequence analyses revealed 32 Barcode Index Numbers (BINs), including 11 not previously reported in the Barcode of Life Data System (BOLD). Several distinct genetic lineages were detected, suggesting the presence of cryptic species, misidentified taxa or potential undescribed species, including Torpedo cf. torpedo, Aetomylaeus cf. bovinus, Gymnura cf. sereti, Raja cf. miraletus, and Squalus cf. blainville. Notably, most of the identified species are listed as threatened on the IUCN Red List. These findings underscore the urgent need for comprehensive taxonomic reassessments and updated conservation evaluations, while highlighting the value of integrating molecular identification tools into national fisheries monitoring and management frameworks.