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<p>We describe here the morphological abnormalities found in six free-living specimens of <i>Narcine vermiculata</i>, <i>N. </i>sp., <i>N. entemedor</i>, and <i>Pseudobatus leucorhynchus.</i> Specimens were captured off the coast of the Gulf of Tehuantepec in November and December 2017 using bottom trawl nets and off the Ventanilla Lagoon from August 2023 to March 2024 using gillnets. We found abnormal disc width, pelvic fins, eyes, and spiracles in <i>Narcine vermiculata</i>; abnormal disc development in <i>Narcine </i>sp.; abnormal disc development, anophthalmia, and a spot on the liver in <i>N. entemedor</i>; and clasper absence, abnormal development of the disc and pelvic fins, and malformation of the vertebral column in <i>Pseudobatos leucorhynchus</i>. Based on the total batoid captures obtained during from 52 bottom trawls, we estimate that the probability of finding disc abnormalities (pectoral fins not fused or other types of abnormal development) was 1.0%, whereas anophthalmia occurred in 0.3% of specimens, and 0.2% of males did not have a clasper. The causes of these deformations need to be further investigated, in order to take appropriate actions to preserve the health of ecosystems and human beings.</p>

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Morphological abnormalities in species of the genera Narcine and Pseudobatos (Elasmobranchii: Batoidea) in the Mexican South Pacific

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Edgar Cruz-Acevedo,
  • Adrián López-Arroyo,
  • Sandra Martínez-Reséndiz,
  • Eduardo Juventino Ramírez-Chávez,
  • Adolfo Gracia,
  • Ana María Torres-Huerta

摘要

We describe here the morphological abnormalities found in six free-living specimens of Narcine vermiculata, N. sp., N. entemedor, and Pseudobatus leucorhynchus. Specimens were captured off the coast of the Gulf of Tehuantepec in November and December 2017 using bottom trawl nets and off the Ventanilla Lagoon from August 2023 to March 2024 using gillnets. We found abnormal disc width, pelvic fins, eyes, and spiracles in Narcine vermiculata; abnormal disc development in Narcine sp.; abnormal disc development, anophthalmia, and a spot on the liver in N. entemedor; and clasper absence, abnormal development of the disc and pelvic fins, and malformation of the vertebral column in Pseudobatos leucorhynchus. Based on the total batoid captures obtained during from 52 bottom trawls, we estimate that the probability of finding disc abnormalities (pectoral fins not fused or other types of abnormal development) was 1.0%, whereas anophthalmia occurred in 0.3% of specimens, and 0.2% of males did not have a clasper. The causes of these deformations need to be further investigated, in order to take appropriate actions to preserve the health of ecosystems and human beings.