Effects of Photoperiod on Survival, Growth, Physiological, and Biochemical Indices of Redclaw Crayfish () Juveniles.

Through a 30-day experiment, this study investigated the effects of five photoperiods (0L:24D, 6L:18D, 12L:12D, 18L:6D, and 24L:0D) on the survival, enzyme activity, body color, and growth-related gene expression of redclaw crayfish () juveniles. The results showed that juveniles under 18L:6D and 24L:0D photoperiods exhibited the highest survival rate, which was significantly higher than the survival rates of juveniles under the other three photoperiods ( < 0.05).