Vasal S, Sundararaj B I
J Exp Zool. 1976 Aug;197(2):247-63. doi: 10.1002/jez.1401970206.
Responses of the ovary of the catfish, Heteropneustes fossilis, to various regimes of photoperiod and temperature, were studied during the different periods of the annual ovarian cycle. During the preparatory and post-spawning periods moderate temperatures of 25 degrees C and above, regardless of photoperiod, were more favorable for the formation of yolky (stage III) oocytes than coller temperatures (below 23 degrees C). Even under conditions of continuous dark or light, ovarian development occurred as a function of warm temperatures. Gravid ovaries were maintained beyond the spawning period only with a temperature of 30 degrees C, photoperiod notwithstanding. Nevertheless, moderate or cool temperatures did not prevent the ovarian regression that occurred by the first week of October in the post-spawning period. Regulation of ovarian activity at least in part by an endogenous circannual rhythm appears possible.
在鲶鱼（Heteropneustes fossilis）一年的卵巢周期的不同阶段，研究了其卵巢对各种光照周期和温度条件的反应。在准备期和产卵后期，25摄氏度及以上的适度温度，无论光照周期如何，比低温（低于23摄氏度）更有利于形成含卵黄的（III期）卵母细胞。即使在持续黑暗或光照的条件下，卵巢发育也随着温暖的温度而发生。仅在30摄氏度的温度下，尽管有光照周期的影响，妊娠卵巢在产卵期后仍得以维持。然而，适度或凉爽的温度并不能阻止产卵后期10月第一周出现的卵巢退化。卵巢活动至少部分受内源性年节律调节似乎是可能的。
