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Observation of the embryonic development in Pseudoplatystoma coruscans (Siluriformes: Pimelodidae) under light and scanning electron microscopy

Published online by Cambridge University Press:  01 November 2008

Camila Marques ,
Laura Satiko Okada Nakaghi ,
Francine Faustino ,
Luciana Nakaghi Ganeco  and
José Augusto Senhorini
Camila Marques*
Affiliation:
Departamento de Morfologia e Fisiologia Animal, UNESP – São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884–900, Jaboticabal, SP, Brazil. Aquaculture Center of UNESP, CAUNESP, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil. Departamento de Morfologia e Fisiologia Animal, UNESP – São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil.
Laura Satiko Okada Nakaghi
Affiliation:
Aquaculture Center of UNESP, CAUNESP, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil. Departamento de Morfologia e Fisiologia Animal, UNESP – São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil.
Francine Faustino
Affiliation:
Aquaculture Center of UNESP, CAUNESP, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil.
Luciana Nakaghi Ganeco
Affiliation:
Aquaculture Center of UNESP, CAUNESP, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil.
José Augusto Senhorini
Affiliation:
Centro de Pesquisa e Gestão de Recursos Pesqueiros Continentais – CEPTA/IBAMA, Rod. SP 201, Km 6.5, P.O. Box 64, CEP 13630-970, Pirassununga, SP, Brazil.
*
All correspondence to: C. Marques. Departamento de Morfologia e Fisiologia Animal, UNESP – São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, CEP 14884–900, Jaboticabal, SP, Brazil. Tel:/Fax: +55 16 3209-2654 (r. 232). e-mail: marques.cami@yahoo.com.br
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Summary

Pseudoplatystoma coruscans is a very popular species for tropical fish culture as it has boneless meat of delicate taste and firm texture. Few studies on fish reproductive biology refer to the morphological features of eggs. The goal, therefore, of this present work was to perform a structural and ultrastructural analysis of fertilization and embryonic development in P. coruscans. The incubation period, from fertilization to hatching, lasts 13 h at 28/29 °C and 18 h at 27 °C. The oocytes had a mean diameter of 0.95 mm and hatched larvae were 2.55 mm in diameter. Analysing their development, we observed round, yellow oocytes that bore a double chorion membrane and a single micropyle. At 10 s after fertilization, several spermatozoa were detected attached to the oocyte surface. After 1 min of development, a fertilization cone that obstructed the micropyle could be observed. Segmentation started between 20 and 30 min after fertilization, when the egg cell was then formed. The first cleavage occurred between 30 and 45 min after fertilization, prior to reaching the morula stage (75 and 90 min after fertilization). The epiboly movement started at 120 and 180 min after fertilization and ended at 360 and 480 min after fertilization. Differentiation between cephalic and caudal region was detected after 420 and 600 min after fertilization and larvae hatched between 780 and 1080 min after fertilization. Seven main embryonic development stages were identified: egg cell, cleavage, morula, blastula, gastrula, segmentation with differentiation between cephalic and caudal regions, and hatching.

Keywords

EggsEmbryologyMorphologyPseudoplatystoma coruscansSEM
Type
Research Article
Information
Zygote , Volume 16 , Issue 4 , November 2008 , pp. 333 - 342
Copyright
Copyright © Cambridge University Press 2008

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