Circadian variation in the free fatty acid level of abdominal muscle of Palaemon serratus (Pennant 1777) Crustacea, Decapoda]

Free fatty acids extracted from the abdominal muscle of Palaemon serratus (Crustacea, Decapoda) maintained on a L-D: 19-5 photoperiod show important circadian variations, characterised by two diurnal maximums and one nocturnal by the end of dark period. Principal maximum is diurnal and occurs 7 hours after the beginning of the light phase.