Feeding Rhythm of Red Swamp Crayfish Procambarus clakii

The feeding rhythm of red swamp crayfish Procambarus clakii was studied indoor under weak light less than 100 lx.It was found that the crayfish feed on their food in an apparent rhythm(P0.01) without sexual difference(P0.05).The maximum food consumption occurred during 18:00—19:00(P0.05),followed by 19:00—20:00 and 14:00—15:00(P0.05),and the minimum during the other time.However,unlike common fish,no apparent diurnal feeding rhythm was observed(P0.05).The results will provide quantitative basis for feeding management,polyculture of fish with crayfish,and water quality control in red swamp crayfish culture.