Occurrence and ultrastructural characterization of "nuage" during oogenesis and early spermatogenesis of Piaractus mesopotamicus Holmberg, 1887 (Teleostei)

We investigated the occurrence and ultrastructurally characterized electrondense nuclear material (nuage) released from the nucleus during oogenesis and early spermatogenesis of Piaractus mesopotamicus, a fish from Pantanal Matogrossense (Brazil) having a seasonal reproductive cycle. The female germ cells presented two instances of nuclear material extrusion: in the oogonia and in the oocyte in the perinucleolar phase. In males, material with similar morphology and behavior occurred in the spematogonia. In all cases, this material was associated to mitochondria. The possible function of this material is discussed.

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Bibliographic Details
Main Authors: Abdalla,F. C., Cruz-Landim,C.
Format: Digital revista
Language:English
Published: Instituto Internacional de Ecologia 2004
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842004000400002
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