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

Little is known about reproductive biology of endangered Steindachneridion parahybae, a gonochoristic teleost species inhabiting the Paraíba 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...

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Autores principales: Pandolfi, Matías, Lo Nostro, Fabiana Laura
Publicado: 2016
Materias:
Histology
Karyotype
Ovary
Ovotestes
Testicles
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v14_n4_p_Honji
http://hdl.handle.net/20.500.12110/paper_16796225_v14_n4_p_Honji
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_16796225_v14_n4_p_Honji2023-06-08T16:26:33Z A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study Pandolfi, Matías Lo Nostro, Fabiana Laura Histology Karyotype Ovary Ovotestes Testicles Little is known about reproductive biology of endangered Steindachneridion parahybae, a gonochoristic teleost species inhabiting the Paraíba 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. © 2016, Sociedade Brasileira de Ictiologia. All rights reserved. Fil:Pandolfi, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lo Nostro, F.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v14_n4_p_Honji http://hdl.handle.net/20.500.12110/paper_16796225_v14_n4_p_Honji
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Histology
Karyotype
Ovary
Ovotestes
Testicles
spellingShingle Histology
Karyotype
Ovary
Ovotestes
Testicles
Pandolfi, Matías
Lo Nostro, Fabiana Laura
A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study
topic_facet Histology
Karyotype
Ovary
Ovotestes
Testicles
description Little is known about reproductive biology of endangered Steindachneridion parahybae, a gonochoristic teleost species inhabiting the Paraíba 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. © 2016, Sociedade Brasileira de Ictiologia. All rights reserved.
author Pandolfi, Matías
Lo Nostro, Fabiana Laura
author_facet Pandolfi, Matías
Lo Nostro, Fabiana Laura
author_sort Pandolfi, Matías
title A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study
title_short A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study
title_full A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study
title_fullStr A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study
title_full_unstemmed A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study
title_sort case of intersex occurrence in steindachneridion parahybae (steindachner, 1877) (siluriformes: pimelodidae) under captivity condition: a cytogenetic and morphological study
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16796225_v14_n4_p_Honji
http://hdl.handle.net/20.500.12110/paper_16796225_v14_n4_p_Honji
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