Díaz-Andrade M C, Galíndez E, Estecondo S
Laboratorio de Histología Animal, Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina.
Braz J Biol. 2009 May;69(2):405-13. doi: 10.1590/s1519-69842009000200025.
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.
近年来，软骨鱼类已成为一种重要的经济资源。尽管具有这种重要性，但人们对它们的生殖生物学知之甚少，尤其是来自西南大西洋的物种。在这项研究中，我们对尖吻银鲛卵巢的形态学和组织学进行了研究。结果表明，卵原细胞仅存在于未成熟雌性个体中（成熟度等级的I期），而处于成熟度II期和III期的标本则显示卵母细胞处于所有发育阶段。在整个卵母细胞发育过程中变化最为重要的组织学特征是卵黄的有无、滤泡细胞的类型和层数以及卵泡膜的发育程度。滤泡细胞至少有两种不同类型。最后，讨论了一种基于卵泡大小在野外确定成熟阶段的新观点。
