Morfologia e desenvolvimento do núcleo vitelínico do lambari Astyanax bimaculatus (Linnaeus, 1758) (Osteichthyes, Characidae)

Morfologia e desenvolvimento do núcleo vitelínico do lambari Astyanax bimaculatus (Linnaeus, 1758) (Osteichthyes, Characidae)

Silvia Dantas Cangussu-Mariani; Elizete Rizzo; Nilo Bazzoli

Depto. Morfologia, ICB, UFMG - C.P. 2.486, 31270 Belo Horizonte-MG

ABSTRACT

A morphological study of the yolk nucleus in previtellogenic oocytes from A. bimacularus has been carried out. Six phases of development were described from its formation closed to the oocyte nucleus to its dispersion in the periferic ooplasm. Histochemical techniques indicate proteins, lipids and RNA in the yolk nucleus of A. bimaculatus, but there are no carbohydrate in this structure. The origin and functional activity of the teleost yolk nucleus are discussed.

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AGRADECIMENTOS

Ao PRPq/UFMG pelo auxílio financeiro e à bióloga Nádia M. Faria de Castro pela coleta do material.

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Datas de Publicação

• Publicação nesta coleção
  10 Ago 2009
• Data do Fascículo
  1990