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Oviposition cycle in the oviparous fish Xenopoecilus sarasinorum

机译：卵生鱼类Xenopoecilus sarasinorum的产卵周期

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摘要

To clarify the reproduction of the oviparous teleost Xenopoecilus sarasinorum, changes in oocyte composition and oviposition cycle were investigated. After release, a batch of spawned eggs hung from the urogenital pore by attaching filaments (36.3 +/- 0.8 in number, n=31; about 4.3-7.8 mm in length, 5-8 mu m in diameter) on the chorion (egg envelope) in the vegetal pole region. Females accommodated a cluster of fertilized eggs in a belly concavity until the embryos hatched. Hatching of embryos took place from 18-19 days after oviposition (25 degrees C). Between 0-2 days following hatching, the attaching filaments disappeared from the urogenital pore. Between 3 and 4 days following hatching, most of the females spawned again. The growth of oocytes proceeded slowly throughout the period when the egg cluster was carried in the belly, and no ovulation occurred during this period. If the current brood was accidentally lost, the day of the next oviposition was sooner. This might imply that carrying embryos in the belly affects endocrine activity, as in viviparous reproduction.
机译：为了阐明卵生硬骨鱼类异形骨的繁殖，研究了卵母细胞组成和产卵周期的变化。释放后，通过将细丝（数量为36.3 +/- 0.8，n = 31;长度约为4.3-7.8 mm，直径为5-8μm）附着在泌尿生殖器孔上，产生了一批产卵卵信封）。雌性在腹部凹处容纳一簇受精卵，直到胚胎孵化。胚胎孵化发生在产卵后（25摄氏度）18-19天。孵化后0-2天之间，附着的细丝从泌尿生殖道的孔中消失。孵化后三到四天，大多数雌性再次产卵。卵簇在腹部携带期间，卵母细胞的生长缓慢进行，在此期间未发生排卵。如果当前的亲戚意外丢失，那么下一次产卵的日子会早些。这可能暗示着在腹部携带胚胎会影响内分泌活动，就像在胎生生殖中一样。

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