Our circadian clock, or biological timing system, governs our daily cycles of feeding, activity and sleep, with respect to external dark and light cycles.

我们的生物钟或生物调时系统，对外界黑夜和天明循环的反应，控制着我们每天进食、活动和睡眠的循环。

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The result showed that the circadian feeding rhythm of juvenile yellow catfish belongs to nocturnal.

结果表明黄颡鱼幼鱼为夜行性摄食，但投喂频率、投喂量等因素直接影响其摄食节律。

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