首页> 外文OA文献 >Gonad development and reproduction in the monoecious species Chlorophthalmus agassizi (Actinopterygii: Aulopiformes: Chlorophthalmidae) from the Sardinian Waters (Central-Western Mediterranean)
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Gonad development and reproduction in the monoecious species Chlorophthalmus agassizi (Actinopterygii: Aulopiformes: Chlorophthalmidae) from the Sardinian Waters (Central-Western Mediterranean)

机译:来自撒丁岛水域(中西地中海)的单性物种Chlorophthalmus agassizi(Actinopterygii:Aulopiformes:Chlorophthalmidae)的性腺发育和繁殖。

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摘要

Background. The shortnose greeneye, Chlorophthalmus agassizi Bonaparte, 1840, is a species with a circumglobal distribution and is among the most abundant commercial fishes in some Mediterranean areas. The knowledge of the biology and ecology of this species is poor and geographically limited, then the aim of this study is to provide a contribution to the knowledge on the reproductive biology of this monoecious deep-sea fish in Sardinian waters. Materials and Methods. In this paper the morphology and the development of the gonads, the mean size at maturity, the monthly evolution in the percent frequency of the maturity stages, and of the indices related to reproduction of the shortnose greeneye were examined. Individuals were caught by trawls, between 270 and 504 m of depth in the Sardinian seas. Results. The ovarian pattern is of an asynchronous type, characterized by releasing of eggs in successive batches. Seven stages of development for the ovary and four for the testis were identified on the basis of macroscopic and histological features. The female portion is the most evident component and shows a later maturation than the male portion. The spawning period is unique and takes place from May to September. Conclusion. The identification of spawning period and the adopted reproductive strategy is essential to obtain a better understanding of its biology and a good management of its fisheries.
机译:背景。短鼻绿眼鲸(Chlorophthalmus agassizi Bonaparte,1840年)是一种分布于全球的物种,是某些地中海地区最丰富的商业鱼类之一。该物种的生物学和生态学知识很贫乏且地理分布有限,因此,本研究的目的是为撒丁岛水域这种雌雄同体的深海鱼的生殖生物学知识提供一个贡献。材料和方法。本文研究了性腺的形态和发育,成熟期的平均大小,成熟期百分频率的月变化以及与短绒头绿眼繁殖有关的指标。在撒丁岛海域,深度为270至504 m的拖网捕获了个体。结果。卵巢模式是异步类型,其特征是连续分批释放卵。根据宏观和组织学特征,确定了卵巢的七个发育阶段和睾丸的四个发育阶段。女性部分是最明显的组成部分,其成熟度要高于男性部分。产卵期是独特的,发生在5月至9月之间。结论。确定产卵期和采用的繁殖策略对于更好地了解其生物学和良好的渔业管理至关重要。

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