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Ontogeny of the digestive tract of Brycon amazonicus (Teleostei, Bryconidae) under culture conditions: from hatching to juvenile stage

Published online by Cambridge University Press:  20 February 2020

Erika Neumann ,
Maria do Carmo Faria Paes Open the ORCID record for Maria do Carmo Faria Paes [Opens in a new window] ,
José Mário Ribeiro Mendes ,
Francisco Manoel de Souza Braga  and
Laura Satiko Okada Nakaghi
Erika Neumann
Affiliation:
Centro de Aquicultura da Universidade Estadual Paulista (CAUNESP). Via de Acesso Professor Paulo Donato Castellane, S/N, CEP: 14884-900. Jaboticabal, São Paulo, Brazil
Maria do Carmo Faria Paes
Affiliation:
Centro de Aquicultura da Universidade Estadual Paulista (CAUNESP). Via de Acesso Professor Paulo Donato Castellane, S/N, CEP: 14884-900. Jaboticabal, São Paulo, Brazil
José Mário Ribeiro Mendes
Affiliation:
Piscicultura Buriti. P.O. Box 198, CEP: 78450-000. Nova Mutum, Mato Grosso, Brazil
Francisco Manoel de Souza Braga
Affiliation:
Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Biociências de Rio Claro, Departamento de Zoologia. Avenida 24 – A, 1515, CEP: 13506-900. Rio Claro, São Paulo, Brazil
Laura Satiko Okada Nakaghi*
Affiliation:
Centro de Aquicultura da Universidade Estadual Paulista (CAUNESP). Via de Acesso Professor Paulo Donato Castellane, S/N, CEP: 14884-900. Jaboticabal, São Paulo, Brazil
*
Author for correspondence: Laura Satiko Okada Nakaghi. Centro de Aquicultura da Universidade Estadual Paulista (CAUNESP). Via de Acesso Professor Paulo Donato Castellane, S/N, CEP: 14884-900. Jaboticabal, São Paulo, Brazil. Tel:/Fax: +55 16 3209 2656 234. E-mail: laurankg@fcav.unesp.br
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Summary

In the present study, the morphological development of the Brycon amazonicus digestive tract is described to provide basic knowledge for nutritional studies and, therefore, increase the survival of this species during larviculture. Samples were collected from hatching up to 25 days of age, measured, processed and observed under a stereomicroscope and light microscopy. Newly hatched larvae presented their digestive tract as a straight tube, dorsal to the yolk sac, lined with a single layer of undifferentiated cells. At 24 h post-hatching (hPH), the buccopharyngeal cavity was open, but the posterior region of the digestive tube remained closed. At 25 hPH, the digestive tube was completely open and could be divided into buccopharyngeal cavity, oesophagus and intestine. At 35 hPH, the intestine presented a dilatation in the proximal region, which had the function of storing food. Differentiation of the stomach started at 83 hPH, and mucous cells were observed in the epithelium. These cells are important in the production of mucus, whose function is to protect the organ against acidity, although the gastric glands began developing only from 171 hPH, when three stomach regions were observed: cardiac, fundic and pyloric. The gastric glands were observed in the cardiac region, indicating that this organ already had digestive functionality. From 243 hPH, the absorption and assimilation of nutrients were already possible but, only from 412 hPH, the digestive tract was completely developed and functional.

Keywords

DevelopmentDigestionFish larvaeHistologyMorphology
Type
Research Article
Information
Zygote , Volume 28 , Issue 3 , June 2020 , pp. 208 - 216
Copyright
© Cambridge University Press 2020

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