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Morphological abnormalities in species of the genera Narcine and Pseudobatos (Elasmobranchii: Batoidea) in the Mexican South Pacific
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Morphological abnormalities in species of the genera Narcine and Pseudobatos (Elasmobranchii: Batoidea) in the Mexican South Pacific
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Morphological abnormalities in species of the genera Narcine and Pseudobatos (Elasmobranchii: Batoidea) in the Mexican South Pacific
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Journal Article
Morphological abnormalities in species of the genera Narcine and Pseudobatos (Elasmobranchii: Batoidea) in the Mexican South Pacific
2025
Overview
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.
