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Abstract
In an 80-day experiment performed with stage 2 juvenile signal crayfish, Pucifastacus leniusculus, under laboratory conditions, two photoperiod/light intensity combinations were tested: natural light conditions (light period lasting between 13.5 and 15 hours/day) and modified light conditions (20:4; 850 lux). There were no significant (P < 0.05) differences in survival (natural light = 55.0% and modified light = 62.5%) and growth rates between treatments. Using conditions in the present study, it may not be necessary to increase photoperiod and light intensity from natural conditions, when raising juvenile signal crayfish indoors.