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Seasonal changes in oocyte size and maturity of the giant jellyfish, Nemopilema nomurai

机译：巨型水母Nemopilema nomurai的卵母细胞大小和成熟度的季节性变化

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摘要

To determine the reproductive season of the giant jellyfish Nemopilema nomurai, we investigated gonadal maturity in specimens collected from the East China Sea, Korea Strait, Wakasa Bay, and the Shonai Coast of Yamagata Prefecture. After the sex of the samples was determined, the long axis of at least 256 oocytes from each female was measured. In specimens collected from the coast of Japan in 2005 and in 2006, all gonads were sufficiently developed to determine sex. However, 18 of the 20 specimens from the East China Sea collected in July 2005 were immature, and sex could not be determined. The maximum and third quartile of oocyte length had a significant correlation with days elapsed from 30 June, but they were not related to bell diameter. Observations of gonad tissue sections of specimens collected in Wakasa Bay in 2006 confirmed that oocyte length was a good proxy for female maturity. Male maturity could also be determined. In conclusion, the sex of all of the small-sized medusae collected along the coast of Japan was determinable, and their gonads were at various stages of development up to fully mature. Therefore, the occurrence of small-sized jellyfish during the autumn in Wakasa Bay is not caused by recruitment of young population from the nearby coast. Keywords Cnidaria - Growth - Life cycle - Maturation - Rhizostoma - Scyphozoa
机译：为了确定巨型水母Nemopilema nomurai的繁殖季节，我们调查了从东海，朝鲜海峡，若狭湾和山形县庄内海岸采集的标本中的性腺成熟度。在确定样品的性别之后，测量每个雌性的至少256个卵母细胞的长轴。在2005年和2006年从日本海岸收集的标本中，所有性腺都已发育成熟，可以确定性别。然而，2005年7月从东海采集的20个标本中有18个不成熟，无法确定性别。卵母细胞长度的最大和第三个四分位数与从6月30日起经过的天数有显着相关性，但与钟形直径无关。对2006年在Wakasa湾采集的标本的性腺组织切片进行的观察证实，卵母细胞的长度是女性成熟的良好代表。男性成熟度也可以确定。总之，在日本沿海收集的所有小型美杜鹃的性别都是可以确定的，它们的性腺处于不同的发育阶段，直至完全成熟。因此，若狭湾在秋季出现小型水母并不是由于附近海岸的年轻种群招募造成的。刺ni-生长-生命周期-成熟-根瘤菌-裂殖体

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