Studies on the reproductive rhythms of fishes - III. Environmental regulation of annual reproductive cycle in a spring-spawning bitterling Acheilognathus tabira.
Studies on the reproductive rhythms of fishes - III. Environmental regulation of annual reproductive cycle in a spring-spawning bitterling Acheilognathus tabira.
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鱼类生殖节律的研究-III．
DOI：
10.2331/suisan.48.1563
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发表时间：
1982
影响因子：
0.4
通讯作者：
I. Hanyu
中科院分区：
文献类型：
--
作者：
A. Shimizu;I. Hanyu
春季产卵的苦齿蝽在其年度繁殖周期的不同阶段被饲养在几种光周期和水温条件的组合下。早春，无论光周期如何，性腺在温暖的温度（16°C）下都迅速发育。初夏，无论光周期如何，性腺在高温（26-30°C）下都会剧烈退化。初秋时节，无论光周期如何，性腺再生的第一阶段，即精母细胞的形成和卵黄囊的积累，都在较低的温度（22°C-16L）下进行。在中秋实验中，性腺复发的第二阶段，即活跃的精子发生和卵黄球的积累，只能通过温热长日照（22°C-16L）处理才能开始。由此可见，田螺的产卵期以春季水温上升为起始，以夏季高温结束。性腺再生的第一阶段是由秋季气温降低引起的。然而，在这个季节，尽管温度允许，但日照较短，阻止了性腺复发的第二阶段。还提出了光周期的季节性变化。
Spring-spawning bitterling Acheilognathus tabira were kept under several combinations of photoperiod and water temperature regimes at different phases of their annual reproductive cycle. In early spring, the gonads developed rapidly under warm temperature (16°C) regardless of photo-period. In early summer, gonads intensely regressed under high temperature (26-30°C), also regardless of photoperiod. In early autumn, the first phase of gonadal recrudescence, i.e. forma-tion of spermatocytes and accumulation of yolk vesicles, proceeded under lower temperature (22°C-16L), regardless of photoperiod. In a mid autumn experiment, the second phase of gonadal recrudescencd, i.e. active spermatogenesis and accumulation of yolk globules, could be commenced only by warm temperature-long day (22°C-16L) treatment. Thus, it is concluded that the spawning period of A. tabira is initiated by the rising of water temperature in spring and is terminated by the high temperature in summer. The first phase of gonadal recrudescence is induced by the lowering temperature in autumn. In this season, how-ever, the second phase of gonadal recrudescence is prevented by the short daylength although the temperature is permissive. Seasonal changes in photoperiodism are also suggested.