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...
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| Published in | Brazilian journal of biology Vol. 69; no. 2; pp. 405 - 413 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Association of the Brazilian Journal of Biology
01.05.2009
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| Online Access | Get full text |
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| Abstract | 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. |
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| AbstractList | 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. 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. Keywords: Chondrichthyes, folliculogenesis, maturity stage, reproductive biology, Sympterygia acuta. Os Chondrichthyes tornaram-se num importante recurso economico nos ultimos anos. Apesar da sua importancia, e muito pouco o que se conhece da sua biologia reprodutiva, especialmente das especies do Atlantico sul-ocidental. Neste trabalho, foi estudada a morfologia e histologia do ovario de Sympterygia acuta. Os resultados mostraram que as oogonias somente encontraram-se presentes nas femeas imaturas (fase I de escala de maturidade) e que os animais em estagio II e III de maturidade exibiram oocitos em todas as etapas de desenvolvimento. As caracteristicas histologicas mais importantes que variam ao longo de desenvolvimento dos oocitos sao a presenca da suarda, o tipo e quantidade de celas foliculares e o grau do desenvolvimento do thecae. Existem pelo menos dois tipos de celulas foliculares. Finalmente se discute um novo ponto de vista para a determinacao dos estagios de maturidade no campo, baseado no tamanho dos foliculos. Palavras-chave: Chondrichthyes, folliculogenesis, fase de maturidade, biologia reprodutiva, Sympterygia acuta. |
| Audience | Academic |
| Author | Diaz-Andrade, M.C Galindez, E Estecondo, S |
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| Title | The ovary of the bignose fanskate Sympterygia acuta Garman, 1877 no estuario de Bahia Blanca, Argentina: morfologia e caracteristicas reprodutivas |
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