Abstract
1. During the winter months, crayfishes maintained at moderate water temperatures (approximately 15° C.) respond to daily illumination by an increased tendency to molt.2. The strength of this tendency to molt increases with increasing length of the daily periods of illumination.3. If there is a threshold below which this response does not occur, it lies below a daily period of illumination of approximately ten and one quarter hours per day.4. There is an increase in mortality in groups exposed to various daily photoperiods with the highest mortality occurring in animals exposed to the longest light period. This is true of animals which fail to show any sign of the initiation of molt at the time of death.
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