Ontogenetic development of the digestive tract in Cuban gar (Atractosteus tristoechus) larvae

Ontogenetic development of the digestive tract in Cuban gar (Atractosteus tristoechus) larvae Histological method was used to describe the development of the digestive tract in Atractosteus tristoechus larvae reared under culture conditions. The larvae were kept at 28 ± 1 °C in three 15 L circular tanks for 18 days and they were fed with Artemia. According to the structural changes in the digestive system, three significant stages were established: (1) lecithotrophic, (2) lecithoexotrophic and (3) exotrophic. The first stage spanned from hatching to 3 days after hatching (DAH), the digestive system started to differentiate and larvae depended entirely on the endogenous nutrition from the yolk sac. During second stage (4–10 DAH), considered critical since it is the transition period to exotrophic feeding, the digestive tract was fully differentiated into buccopharynx, esophagus, non-glandular and glandular stomach, anterior and posterior intestine. First periodic Schiff reagent-positive goblet cells also appeared, interdispersed within the epithelium of the digestive tract, increasing substantially in numbers and distribution as development continued. At this early stage, gastric glands were only observed in the fundic stomach and not in the cardiac and pyloric region. Pyloric caeca, spiral valve and rectum were also clearly distinguishable in the intestine. After the onset of the exogenous feeding (11–18 DAH), the organization and differentiation of the digestive tract did not undergo any noticeable modification, only the increase in size and complexity of the structures, and it attained the four tissue layer arrangement characteristic of adult vertebrates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

Ontogenetic development of the digestive tract in Cuban gar (Atractosteus tristoechus) larvae

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Publisher
Springer Netherlands
Copyright
Copyright © 2012 by Springer Science+Business Media Dordrecht
Subject
Life Sciences; Freshwater & Marine Ecology; Zoology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1007/s11160-012-9289-z
Publisher site
See Article on Publisher Site

Abstract

Histological method was used to describe the development of the digestive tract in Atractosteus tristoechus larvae reared under culture conditions. The larvae were kept at 28 ± 1 °C in three 15 L circular tanks for 18 days and they were fed with Artemia. According to the structural changes in the digestive system, three significant stages were established: (1) lecithotrophic, (2) lecithoexotrophic and (3) exotrophic. The first stage spanned from hatching to 3 days after hatching (DAH), the digestive system started to differentiate and larvae depended entirely on the endogenous nutrition from the yolk sac. During second stage (4–10 DAH), considered critical since it is the transition period to exotrophic feeding, the digestive tract was fully differentiated into buccopharynx, esophagus, non-glandular and glandular stomach, anterior and posterior intestine. First periodic Schiff reagent-positive goblet cells also appeared, interdispersed within the epithelium of the digestive tract, increasing substantially in numbers and distribution as development continued. At this early stage, gastric glands were only observed in the fundic stomach and not in the cardiac and pyloric region. Pyloric caeca, spiral valve and rectum were also clearly distinguishable in the intestine. After the onset of the exogenous feeding (11–18 DAH), the organization and differentiation of the digestive tract did not undergo any noticeable modification, only the increase in size and complexity of the structures, and it attained the four tissue layer arrangement characteristic of adult vertebrates.

Journal

Reviews in Fish Biology and FisheriesSpringer Journals

Published: Oct 14, 2012

References

  • Ultrastructural study on the intestine of Senegal sole, Solea senegalensis
    Arellano, JM; Storch, V; Sarasquete, C
  • Ontogeny of the digestive tract during larval development of yellowtail flounder: a light microscopic and mucous histochemical study
    Baglole, CJ; Murray, HM; Goff, GP; Wright, GM
  • Development of the digestive tract in larval summer flounder
    Bisbal, GA; Bengtson, DA
  • Ontogenetic development of the digestive system in yellowtail kingfish Seriola lalandi larvae
    Chen, BN; Qin, JG; Kumar, MS; Hutchinson, W; Clarke, S
  • Digestive enzyme activity during early larval development of the Cuban gar Atractosteus tristoechus
    Comabella, Y; Mendoza, R; Aguilera, C; Carrillo, O; Hurtado, A; García-Galano, T

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