Embryonic development of teleost Brycon orbignyanus

Zygote : the Biology of Gametes and Early Embryos
Luciana Nakaghi Ganeco-KirschnikLaura Satiko Okada Nakaghi

Abstract

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 cl...Continue Reading

References

Jul 1, 1995·Developmental Dynamics : an Official Publication of the American Association of Anatomists·C B KimmelT F Schilling
Jul 11, 2006·Zygote : the Biology of Gametes and Early Embryos·Alexandre Ninhaus-SilveiraAlexandre de Azevedo
Jul 20, 2007·Zygote : the Biology of Gametes and Early Embryos·A Ninhaus-SilveiraR Veríssimo-Silveira
Nov 16, 2013·Zygote : the Biology of Gametes and Early Embryos·Fernanda Nogueira ValentinLaura Satiko Okada Nakaghi
Nov 3, 2016·Zygote : the Biology of Gametes and Early Embryos·Matheus Pereira Dos SantosLaura Satiko Okada Nakaghi
Nov 23, 2016·Zygote : the Biology of Gametes and Early Embryos·Camila MarquesLaura Satiko Okada Nakaghi
Sep 21, 2017·Zygote : the Biology of Gametes and Early Embryos·Regiane Cristina da SilvaLaura Satiko Okada Nakaghi
Oct 31, 2017·Zygote : the Biology of Gametes and Early Embryos·Alexandre N MariaAna T M Viveiros

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