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<p>The genus <i>Urogymnus</i> comprises six distinct species, with three species (<i>U. asperrimus</i>, <i>U. granulatus</i>, and <i>U. polylepis</i>) sparsely reported from Indian waters. The current paper presents confirmed observations of all three species and the discovery of new river systems where <i>U. polylepis</i> was observed for the first time. Four adult <i>U. asperrimus</i> (Bloch &amp; Schneider 1801) specimens (disc width = 90~91 cm) were caught near the Lakshadweep islands and were auctioned in Mangalore fish market. The molecular barcodes generated from two separate specimens displayed 100% genetic similarity with specimens from the same region. A single specimen of <i>U. granulatus</i> (MacLeay 1883) (disc width = 132&#xa0;cm) was landed near Pamban harbour, hence indicating the Gulf of Munnar (GoM) region to be a stable habitat of this species. Seven specimens of <i>U. polylepis</i> (Bleeker 1852) (disc width = 95~345 cm) were landed in Kankinara (Andhra Pradesh), Digha, and Bankra fish markets (West Bengal). These specimens were caught from the Ichamati and the Goureshwar rivers in West Bengal, the Subarnarekha and the Budhabalanga rivers in Orissa, and the Godavari river in Andhra Pradesh. Specimens from Ichamati were caught approximately 103&#xa0;km from the river mouth. Fishers from Ichamati and Godavari reported a steep decline in <i>U. polylepis</i> populations, suggesting more than 80% declines were mainly due to overfishing. The present paper assists in identifying pocket habitats of endangered <i>Urogymnus</i> species found in India, especially near the Lakshadweep islands, the GoM, and the Sunderban biosphere reserve, which is crucial for conservation and developing fishery management strategies.</p>

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New reports reveal novel habitats and geographic range extension of endangered Urogymnus rays across the Indian coastal and riverine ecosystems

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Sourav Chattopadhyay,
  • Mohammad Syed Abdul Rahman,
  • Kumaran Ramachandran

摘要

The genus Urogymnus comprises six distinct species, with three species (U. asperrimus, U. granulatus, and U. polylepis) sparsely reported from Indian waters. The current paper presents confirmed observations of all three species and the discovery of new river systems where U. polylepis was observed for the first time. Four adult U. asperrimus (Bloch & Schneider 1801) specimens (disc width = 90~91 cm) were caught near the Lakshadweep islands and were auctioned in Mangalore fish market. The molecular barcodes generated from two separate specimens displayed 100% genetic similarity with specimens from the same region. A single specimen of U. granulatus (MacLeay 1883) (disc width = 132 cm) was landed near Pamban harbour, hence indicating the Gulf of Munnar (GoM) region to be a stable habitat of this species. Seven specimens of U. polylepis (Bleeker 1852) (disc width = 95~345 cm) were landed in Kankinara (Andhra Pradesh), Digha, and Bankra fish markets (West Bengal). These specimens were caught from the Ichamati and the Goureshwar rivers in West Bengal, the Subarnarekha and the Budhabalanga rivers in Orissa, and the Godavari river in Andhra Pradesh. Specimens from Ichamati were caught approximately 103 km from the river mouth. Fishers from Ichamati and Godavari reported a steep decline in U. polylepis populations, suggesting more than 80% declines were mainly due to overfishing. The present paper assists in identifying pocket habitats of endangered Urogymnus species found in India, especially near the Lakshadweep islands, the GoM, and the Sunderban biosphere reserve, which is crucial for conservation and developing fishery management strategies.