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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study

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Author(s):
Honji, Renato M. ; Caneppele, Danilo ; Pandolfi, Matias ; Lo Nostro, Fabiana L. ; Moreira, Renata G.
Total Authors: 5
Document type: Journal article
Source: Neotropical Ichthyology; v. 14, n. 4 2016.
Web of Science Citations: 3
Abstract

Little is known about reproductive biology of endangered Steindachneridion parahybae, a gonochoristic teleost species inhabiting the Paraiba do Sul River Basin, and herein is the first description of intersex in S. parahybae juvenile. The normal appearance of ovaries and testes in juvenile from the same lot of breeding were also described for comparison, even as cytogenetic analysis was performed in these juveniles. One specimen was a priori classified as female due to the macroscopic characteristic of ovaries, with small yellow oocytes, without fringes (a main characteristic of catfish male), and larger than testes; however the microscopic analysis revealed the presence of ovotestes, including the complete spermatogenesis. S. parahybae had diploid number, 2n = 56 chromosomes with no evidence of differentiated sex chromosomes or supernumerary chromosomes among them. These findings may be due to the result of exposure to endocrine disrupting compounds or may also be influenced by environmental conditions. The possibility of intersexes might also happen spontaneously and it cannot be ruled out. Therefore, the functional significance and reproductive consequences of this anomaly remain to be determined, suggesting that this species may be susceptible to endocrine disruption. These results contribute to gain expertise about reproductive biology of an endangered species in captivity. (AU)

FAPESP's process: 12/50918-1 - Behavioral performance in ectothermic vertebrates: responses to environmental change
Grantee:Carlos Arturo Navas Iannini
Support type: Regular Research Grants
FAPESP's process: 08/57687-0 - Effects of global climate change of the Brazilian fauna: a conservation physiology approach
Grantee:Carlos Arturo Navas Iannini
Support type: Research Program on Global Climate Change - Thematic Grants