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Early development of Astronotus ocellatus under stereomicroscopy and scanning electron microscopy

Published online by Cambridge University Press:  18 March 2011

Maria do Carmo Faria Paes ,
Lilian Cristina Makino ,
Leonardo Avendaño Vasquez ,
João Batista Kochenborger Fernandes  and
Laura Satiko Okada Nakaghi
Maria do Carmo Faria Paes*
Affiliation:
Aquaculture Center of UNESP – CAUNESP – Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884–900, Jaboticabal, SP, Brazil.
Lilian Cristina Makino
Affiliation:
Aquaculture Center of UNESP – CAUNESP – Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884–900, Jaboticabal, SP, Brazil.
Leonardo Avendaño Vasquez
Affiliation:
Universidad Nacional da Colombia, Carrera 45 N° 26–85 – Edificio Uriel Gutiénez, Bogotá – D.C., Colombia.
João Batista Kochenborger Fernandes
Affiliation:
Aquaculture Center of UNESP – CAUNESP – Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884–900, Jaboticabal, SP, Brazil.
Laura Satiko Okada Nakaghi
Affiliation:
Aquaculture Center of UNESP – CAUNESP – Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884–900, Jaboticabal, SP, Brazil.
*
All correspondence to: Maria do Carmo Faria Paes. Aquaculture Center of UNESP – CAUNESP – Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884–900, Jaboticabal, SP, Brazil. Tel:/Fax: +55 16 3209 2656. e-mail: [email protected].
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Summary

Astronotus ocellatus, popularly known as Oscar, is a cichlid fish from the Amazon basin (Brazil) with a great potential for fish farming. The aim of this research is to describe the morphology of eggs and larvae of A. ocellatus under stereomicroscopy and scanning electron microscopy. Eggs from natural spawnings were taken to hatcheries, collected at previously established time periods and then analysed. Oscar's eggs are demersal, adhesive and fragile to touch, with a slightly oval shape. The fertile eggs are yellowish in colour and when unfertilized are a white opaque colour. In the initial collection (IC), the majority of eggs were found to be at the gastrula phase with 30% epiboly. At 12 h after the IC, the formation of the embrionary axis and somites was observed, followed by differentiation of the tail and of the head. Fifteen hours after the IC, the emergence of the optic and otic vesicles, and of adhesive glands and the yolk pigmentation was observed. Larval hatching took place between 46 and 58 h after the first collection, at an average temperature of 27.45 ± 2.13°C. The larval stage was characterized by the development of the heart, fins, branchial apparatus, neuromasts, taste buds and adhesive glands on the head. Larval development to yolk absorption took a period of 257 h. These results provide important information for reproduction, rearing and preservation of A. ocellatus.

Keywords

EmbryoLarvaeMorphologyOntogenyOscarReproduction
Type
Research Article
Information
Zygote , Volume 20 , Issue 3 , August 2012 , pp. 269 - 276
Copyright
Copyright © Cambridge University Press 2011

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