Publication: Larval organogenesis of Pagrus pagrus L., 1758 with special attention to the digestive system development
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Date
2007
Authors
Darias, M.J. ; Ortiz-Delgado, J.B. ; Sarasquete, C. ; Martínez Rodríguez, G. ; Yúfera, M.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Organogenesis of the red porgy (Pagrus
pagrus L., 1758) was examined from hatching until 63
days post-hatching (dph) using histological and
histochemical techniques. At hatching, the heart
appeared as a tubular structure which progressively
developed into four differentiated regions at 2 dph:
bulbus arteriosus, atrium, ventricle and sinus venosus.
First ventricle and atrium trabeculae were appreciated at
6 and 26 dph, respectively. Primordial gill arches were
evident at 2 dph. Primordial filaments and first lamellae
were observed at 6 and 15 dph, respectively. At mouth
opening (3dph), larvae exhausted their yolk-sac reserves.
The pancreatic zymogen granules appeared at 6 dph.
Glycogen granules, proteins and neutral lipids (vacuoles
in paraffin sections) were detected in the cytoplasm of
the hepatocytes from 4-6 dph. Hepatic sinusoids could
be observed from 9 dph. Pharyngeal and buccal teeth
were observed at 9 and 15 dph, respectively.
Oesophageal goblet cells appeared around 6 dph,
containing neutral and acid mucosubstances. An
incipient stomach could be distinguished at 2 dph. The
first signs of gastric gland development were detected at
26 dph, increasing in number and size by 35-40 dph.
Gastric glands were concentrated in the cardiac stomach
region and presented a high content of protein rich in
tyrosine, arginine and tryptophan. The intestinal mucous
cells appeared at 15 dph and contained neutral and acid glycoconjugates, the carboxylated mucins being more
abundant than the sulphated ones. Acidophilic
supranuclear inclusions in the intestinal cells of the
posterior intestine, related to pynocitosis of proteins,
were observed at 4-6 dph.
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