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sperm plasma membrane integrity

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Sperm characterization of the Amazonian freshwater cururu stingray Potamotrygon wallacei (Potamotryogonidae): basic knowledge for reproduction and conservation plans
Ruben Dario Morales-Gamba, Jôsie Schwartz Caldas, Leandro Godoy, Jaydione Luiz Marcon
Journal:

Zygote / Volume 27 / Issue 4 / August 2019

Published online by Cambridge University Press:

09 August 2019, pp. 259-261
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This study aimed to describe the morphology and sperm quality of free-living adult males of cururu stingray Potamotrygon wallacei, endemic from the Rio Negro basin, Brazilian Amazon. The sperm was collected in loco from the seminal vesicle region and fixed in buffered saline formaldehyde solution for further evaluation of morphometry, sperm plasma membrane integrity and sperm concentration. The spermatozoa presented a total length of 138.25 ± 1.82 μm with a helical shape and a long head. A high percentage of cells with intact membrane (98 ± 2%) and normal spermatozoa (92 ± 1%) were observed. The cell concentration was 0.34 ± 0.05 × 1010 spermatozoa/ml of semen. These observations are unprecedented for potamotrygonid species and will serve as a basis for future management and conservation strategies.