Programa de Pós-Graduação em Biologia de Vertebrados, Pontifícia Universidade Católica de Minas Gerais, Av. Dom José Gaspar, 500, 30535-901 Belo Horizonte, MG, Brazil.
Centro Integrado de Recursos Pesqueiros e Aquicultura de Três Marias/CODEVASF, Estrada Piscicultura, s/n, 39205-000 Três Marias, MG, Brazil.
An Acad Bras Cienc. 2022 Mar 25;94(2):e20190919. doi: 10.1590/0001-3765202220190919. eCollection 2022.
The gametogenesis and reproduction of S. elegans from the São Francisco River at Três Marias, Minas Gerais, were analyzed in this study. Steindachrina elegans is a species abundant in the São Francisco River basin and an important fish in the food chain. The size at first gonadal maturation (indicated by the total length of the shortest spermatid male and spawned female) was 10.5 cm and 15.0 cm, respectively. Reproduction occurred more frequently from September to April. This period had high water temperature values. A high frequency of females was observed at the mature and spawned stages and height gonadosomatic index (GSI). Meanwhile, in males, the reproductive peak was from November to February. The long spawning period and the histological characteristics of the spawned ovaries that contained oocytes at different stages of development along with post-ovulatory and atretic oocytes indicates that the spawning of S. elegans is of the partial type.
本研究分析了米纳斯吉拉斯州特雷斯马里亚斯圣弗朗西斯科河的 S. elegans 的配子发生和繁殖。Steindachrina elegans 是圣弗朗西斯科河流域丰富的物种，也是食物链中的重要鱼类。第一次性腺成熟（以最短精子雄性和产卵雌性的总长度表示）的大小分别为 10.5 厘米和 15.0 厘米。繁殖更频繁地发生在 9 月至 4 月。这个时期的水温值较高。在成熟和产卵阶段观察到大量的雌性，性腺体指数（GSI）较高。同时，在雄性中，繁殖高峰期是从 11 月到 2 月。S. elegans 的产卵期较长，产卵后的卵巢组织学特征表明，其产卵类型为部分式。
