The ovary of the bignose fanskate Sympterygia acuta Garman, 1877 no estuario de Bahia Blanca, Argentina: morfologia e caracteristicas reprodutivas

Chondrichthyes have become an important economic resource in recent years. In spite of this importance, there is little knowledge about their reproductive biology, especially of species from the south-western Atlantic. In this work, we study the morphology and histology of the ovary of Sympterygia a...

Full description

Saved in:
Bibliographic Details
Published inBrazilian journal of biology Vol. 69; no. 2; pp. 405 - 413
Main Authors Diaz-Andrade, M.C, Galindez, E, Estecondo, S
Format Journal Article
LanguageEnglish
Published Association of the Brazilian Journal of Biology 01.05.2009
Online AccessGet full text

Cover

More Information
Summary:Chondrichthyes have become an important economic resource in recent years. In spite of this importance, there is little knowledge about their reproductive biology, especially of species from the south-western Atlantic. In this work, we study the morphology and histology of the ovary of Sympterygia acuta. The results show that oogonia were present only in the immature females (stage I of maturity scale), whereas specimens in stages II and III of maturity displayed oocytes in all developmental steps. The most important histological features that vary throughout oocyte development are the presence or absence of yolk, the number of types and layers of follicular cells and the degree of development of the thecae. Follicular cells are, at least, of two different types. Finally, a new point of view for the determination of maturity stages in the field based on the size of follicles is discussed.
ISSN:1519-6984
1678-4375