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首页> 外文期刊>Indian Journal of Fisheries >Anatomical changes during early gonad development in the protogynous greasy grouper Epinephelus tauvina (Forsskal)
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Anatomical changes during early gonad development in the protogynous greasy grouper Epinephelus tauvina (Forsskal)

机译：雌性油腻石斑鱼斑节虾（Forsskal）性腺发育早期的解剖学变化

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摘要

Anatomical changes during early gonad development of the culturable species of grouper Epinephelus tauvina was studied. All juveniles developed an ovarian phase initially followed by the bisexual phase gonad. Bisexual phase gonad occurred when the fish was around two years old and in the length range of 188-380 mm total length. The minimum size at first sexual maturation for females was 380 mm total length at an age of two and a half years. The presence of bisexual phase and spermatogenic cysts in juvenile gonads in E. tauvina could be an indication of primary male differentiation. Based on gonadal histological study of E. tauvina till first sexual maturation, it was found that all the juveniles developed an ovarian structure initially and subsequently developed a bisexual phase with male tissue scattered among lamellae, prior to first sexual maturation as females. Although it was not possible to find any primary males among fishes collected from the wild, the developmental significance of a bisexual phase in E. tauvina juveniles is assumed to be similar to diandric protogynous species, having secondary males as well as primary males developed directly from juveniles through sexual differentian.
机译：研究了石斑鱼石斑鱼的可培养物种在性腺发育早期的解剖学变化。所有的少年最初都发展为卵巢期，然后是双性恋性腺。双鱼性腺发生在两岁左右且鱼的总长度为188-380 mm时。女性在第一次性成熟时的最小尺寸为2岁半时的总长度为380 mm。牛肝菌中性腺的双性恋和生精囊肿的存在可能是男性分化的征兆。根据对tauvina的性腺组织学研究，直到首次性成熟之前，所有幼体均开始形成卵巢结构，随后发展为双性恋阶段，男性组织散布在片状细胞中，而在女性首次性成熟之前。尽管不可能在野外采集的鱼类中找到任何原代雄性，但据推测，牛肝菌幼体中双性恋阶段的发育意义与原宿双原种相似，既有次生雄性又有直接从中生出的原种雄性。青少年通过性差异。

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