Report on fetal mummification in the scalloped hammerhead shark Sphyrna lewini.
Carcharhiniformes, embryo, hematic mummification, Sphyrnidae, umbilical torsion
Journal
Journal of fish biology
ISSN: 1095-8649
Titre abrégé: J Fish Biol
Pays: England
ID NLM: 0214055
Informations de publication
Date de publication:
Jul 2020
Jul 2020
Historique:
received:
17
09
2019
revised:
18
04
2020
accepted:
01
05
2020
pubmed:
6
5
2020
medline:
24
11
2020
entrez:
6
5
2020
Statut:
ppublish
Résumé
This study describes the fetal mummification process in two embryos of a 310 cm total length scalloped hammerhead shark Sphyrna lewini caught in southeastern Brazil, in December 2017. Fourteen embryos were observed in total, in which two males in the left uterus presented different stages of mummification. Both mummified embryos were covered by an exudate (i.e., a mucous substance), indicating a hematic mummification process. All embryos were at the placentotrophic stage of development, indicating that they were close to parturition. An intrinsic characteristic is suggested as possible etiology for this condition, such as umbilical torsion, because both embryos were at different sizes and, therefore, at different development stages. In addition, the sample size did not allow the authors to presume any pollution effect once only one female was observed. Finally, fetal mummification and other embryonic development disorders might have populational impacts due to reduction in embryo survival and, consequently, recruitment. For this reason and considering that S. lewini is categorized as a "critically endangered species," this study's results have conservational relevance.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
309-313Subventions
Organisme : M.F.M. is supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. In addition, O.B.F.G. is supported by the National Council for Scientific and Technological Development (CNPq - # 308430/2015-8).
Informations de copyright
© 2020 The Fisheries Society of the British Isles.
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