The dynamics of oocyte growth during vitellogenesis in the rainbow trout (Oncorhynchus mykiss).
The dynamics of oocyte growth during vitellogenesis in the rainbow trout (Oncorhynchus mykiss).
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虹鳟（Oncorhynchus mykiss）卵黄发生过程中卵母细胞生长的动态。
DOI：
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发表时间：
1990
影响因子：
3.6
通讯作者：
P. Witthames
中科院分区：
文献类型：
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作者：
C. Tyler;J. Sumpter;P. Witthames
本报告描述了一个处女雌性虹鳟鱼种群卵黄发生过程中卵母细胞生长的动态。研究期间，卵巢发育指数急剧增加：性腺指数（GSI）增加了50倍以上，在排卵前达到峰值20;平均卵母细胞直径从不到1毫米增加到5.4毫米;血浆卵黄蛋白原水平从不到1.5毫克/毫升增加到25毫克/毫升。有没有变化的发展中的卵母细胞（测量0.5毫米或更大的直径）的时间时，大多数的卵母细胞进行二次发育已进入卵黄发生在8月排卵（平均4000卵母细胞每鱼）。因此，卵黄发生过程中卵巢重量的增加是由于卵母细胞大小的增加，而不是招募更多成熟的卵母细胞。在整个研究过程中，卵巢中卵黄发生卵母细胞的数量也表明，卵黄发生卵母细胞闭锁在决定生育力方面并不起重要作用。在卵黄发生早期，卵巢内成熟卵母细胞的体积变化高达250倍。从9月开始，当该季节所有要排卵的卵母细胞都进入卵黄发生时，大小开始逐渐均匀，因此在2月排卵时，所有卵子的大小都非常相似（体积变化小于2倍）。卵黄发生过程中卵母细胞在卵巢中的生长模式表明卵母细胞之间的生长是密切协调的。
This report describes the dynamics of oocyte growth during vitellogenesis in a population of virgin female rainbow trout. Indices of ovarian development increased dramatically during the period of study: the gonadosomatic index (GSI) increased over 50-fold, reaching a peak of 20 just before ovulation; the mean oocyte diameter increased from less than 1 mm to 5.4 mm; and plasma levels of vitellogenin increased from less than 1.5 mg/ml to 25 mg/ml. There were no changes in the numbers of developing oocytes (measuring 0.5 mm or greater in diameter) from the time when the majority of oocytes undergoing secondary development had entered vitellogenesis in August to ovulation in February (averaging 4000 oocytes per fish). The increase in ovary weight during vitellogenesis was, therefore, due to an increase in the size of oocytes rather than to recruitment of more maturing oocytes. The numbers of vitellogenic oocytes in the ovary during the entire study also suggested that atresia of vitellogenic oocytes does not play a prominent role in determining fecundity. During early vitellogenesis, the volume of maturing oocytes within an ovary varied by as much as 250-fold. From September onwards, when all oocytes to be ovulated that season had entered vitellogenesis, a gradual uniformity in size began to develop, such that at ovulation, in February, all the eggs were very similar in size (there was less than a 2-fold variation in volume). The pattern of growth of oocytes in an ovary during vitellogenesis suggests that growth between oocytes is closely coordinated.