Publication: Posthatch development of the axial musculature of the common dentex Dentex dentex, L (Teleostei)
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Date
2010
Authors
Arizcun Arizcun, Marta ; Abellán, E. ; Blanco, A. ; Ayala Florenciano, María Dolores ; Latorre Reviriego, Rafael Manuel ; López Albors, Octavio Miguel ; Pastor García, Luis Miguel
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The common dentex is a promising candidate
for Mediterranean aquaculture. The present work is
aimed at describing the development of the axial
musculature from hatching to postlarval life.
Transmission electron microscopy, histochemical
(NADH-TR and mATPase) and immunohistochemical
techniques (S-58 and TUNEL) have been used. At
hatching superficial red and deep white muscles can be
distinguished. Presumptive dermomyotome (external)
cells are initially located over the superficial red muscle
but shortly (2 days) tend to concentrate towards the
epaxial and hipaxial limits of the myotome. Then, these
cells enter the myotome and spread around and within
the white muscle thus being apparently responsible for
the stratified hyperplasia of the myotome. Mosaic
hyperplasia is activated during the second half of the
larval period and initially relies on differentiation of a
population of atypical premyoblastic cells (APC). APC
are mononuclear cells with euchromatic nuclei,
cytoplasms full of thin longitudinally projected tubules,
occasional mitochondria and scattered ribosomes. By the
end of the larval period these cells tend to disappear,
partly due to apoptosis, but postlarval mosaic
hyperplasia continues by differentiation of presumptive
myosatellite cells. APC are an unexpected and singular
finding of this study which deserves more research, so as
to further characterize their ancestry, developmental
programme and fate. In addition to the white and
superficial red muscle fibres, intermediate (pink) and
tonic fibres appear during larval metamorphosis. Later,
during the early postlarval life, a new type of slow
twitch red muscle fibre is differentiated (red adult type).
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