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Oocyte adhesiveness and embryonic development of Astyanax bimaculatus (Linnaeus, 1758) (Pisces: Characidae)

Published online by Cambridge University Press:  02 May 2012

André Alberto Weber ,
Fábio Pereira Arantes ,
Yoshimi Sato ,
Elizete Rizzo  and
Nilo Bazzoli
André Alberto Weber
Affiliation:
Programa de Pós-graduação em Zoologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Av. Dom José Gaspar, 500, CEP: 30535-610, Belo Horizonte, MG, Brasil.
Fábio Pereira Arantes
Affiliation:
Programa de Pós-graduação em Zoologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Av. Dom José Gaspar, 500, CEP: 30535-610, Belo Horizonte, MG, Brasil.
Yoshimi Sato
Affiliation:
Estação de Hidrobiologia e Piscicultura de Três Marias, Companhia de Desenvolvimento dos Vales do São Francisco e Parnaíba, P.O. Box 11, CEP: 39205-000, Três Marias, MG, Brasil.
Elizete Rizzo
Affiliation:
Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, UFMG, P.O. Box 486, CEP: 30161-970, Belo Horizonte, MG, Brasil.
Nilo Bazzoli*
Affiliation:
Programa de Pós-graduação em Zoologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, PUC Minas, Av. Dom José Gaspar, 500, CEP: 30535-610, Belo Horizonte, MG, Brasil.
*
All correspondence to: N. Bazzoli. Programa de Pós-graduação em Zoologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, PUC Minas, Av. Dom José Gaspar, 500, CEP: 30535-610, Belo Horizonte, MG, Brasil. Tel: +55 31 33194936. Fax: +55 31 33194269. e-mail: [email protected]
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Summary

This study shows for the first time the presence of a jelly coat on oocytes of neotropical Characiformes fish. This structure could be responsible for the adhesiveness of Astyanax bimaculatus oocytes, a species widely distributed in South America including in the São Francisco River basin in Brazil. Adult specimens of A. bimaculatus were submitted to artificial reproduction in order to analyse the egg morphology and embryonic development. The eggs were fertilised and kept in incubators with a water temperature of 24°C so that embryogenesis could be monitored. Ovulated and unfertilised oocytes were also collected and submitted to routine histological techniques. Astyanax bimaculatus oocytes were found to be spherical, yellowish, and covered by a thin jelly coat with a slightly adhesive surface. The mean oocyte diameter was 1.03 ± 0.03 mm, the perivitelline space was 0.21 ± 0.02 mm and the jelly coat's thickness was 0.04 ± 0.01 mm. Positive periodic acid–Schiff (PAS) stain and Alcian blue stain pH 2.5 indicated the presence of neutral glycoproteins, and carboxylated acid glycoconjugates on the jelly coat that formed mucosubstances that may be associated with egg adhesiveness. At a water temperature of 24°C, blastopore closure and hatching occurred at 5 h and 17 h after fertilisation, respectively. The results of this study provide essential information for phylogenetic studies and for a better understanding of the reproductive strategy of A. bimaculatus, currently included in the incertae sedis group of the Characidae family due to the lack of monophyly among the families of the group.

Keywords

AdhesivenessCharacidaeEmbryogenesisIncertae sedisJelly coat
Type
Research Article
Information
Zygote , Volume 21 , Issue 2 , May 2013 , pp. 198 - 202
Copyright
Copyright © Cambridge University Press 2012

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