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Embryonic development of teleost Brycon orbignyanus

Published online by Cambridge University Press:  18 September 2018

Luciana Nakaghi Ganeco-Kirschnik ,
Irene Bastos Franceschini-Vicentini ,
Maria do Carmo Faria Paes Open the ORCID record for Maria do Carmo Faria Paes [Opens in a new window]  and
Laura Satiko Okada Nakaghi
Luciana Nakaghi Ganeco-Kirschnik*
Affiliation:
Embrapa, Palmas; Aquaculture Center of São Paulo State University, Jaboticabal; Department of Biological Sciences – São Paulo State University, Bauru; and Department of Animal Morphology and Physiology – São Paulo State University, Jaboticabal, Brazil
Irene Bastos Franceschini-Vicentini
Affiliation:
Aquaculture Center of São Paulo State University, Jaboticabal – SP, Brazil Department of Biological Sciences – São Paulo State University, Bauru – SP, Brazil
Maria do Carmo Faria Paes
Affiliation:
Department of Animal Morphology and Physiology – São Paulo State University, Jaboticabal – SP, Brazil
Laura Satiko Okada Nakaghi
Affiliation:
Aquaculture Center of São Paulo State University, Jaboticabal – SP, Brazil Department of Animal Morphology and Physiology – São Paulo State University, Jaboticabal – SP, Brazil
*
Author for correspondence: Luciana Nakaghi Ganeco-Kirschnik. Embrapa, Caixa Postal No. 90 CEP:77001-970. Palmas – TO, Brazil. E-mail: luciana.ganeco@embrapa.br
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Summary

Brycon orbignyanus is an important large teleost that is currently on the list of endangered species, therefore studies on its reproductive biology and embryology are fundamental to help species conservation and recovery. The objective of this research was to characterize the events that occur during extrusion, fertilization and embryonic development of the species. The samples were collected at predetermined times, fixed and processed for light microscopy and scanning electron microscopy. The greenish oocytes were spherical, had translucent chorion and a mean diameter of 1.3±0.11 mm. The eggs had well defined animal and vegetative poles approximately 18 min post-fertilization. Stages from 2 to 128 blastomeres occurred between 20 min and 3 h post-fertilization (hPF), when the morula was characterized. The blastula stage was observed between 2 and 3 hPF, and the gastrula between 3 and 7 hPF, when the embryonic shield emerged and the cellular migration with the consequent formation of epiblast and hypoblast. At 8 hPF, the formation of the neural tube, above the notochord and the encephalic region, was observed, delimiting the forebrain, mesencephalon and rhombencephalon regions. From 11 hPF onward, the optic vesicle was formed close to the forebrain and the embryo tail was well developed. The optic vesicle was observed from 12 hPF onward, and the tail showed an intense movement that culminated with the rupture of the chorion and consequent hatching of the larva at 13 hPF and 27°C.

Keywords

EmbryologyFishHistologyReproductionUltrastructure
Type
Research Article
Information
Zygote , Volume 26 , Issue 4 , August 2018 , pp. 294 - 300
Copyright
© Cambridge University Press 2018 

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