Abstract
The esterase activities of Penaeus japonicus hemolymph, revealed by a mixture of α- and β-naphtylacetate exhibit tricircadian variations under an LD:12-12 photoperiod. During the 24 h period, the total esterase activities can vary by 0,12 to 0,64 V/μg of protein. Under the experimental conditions adopted, circadian variations of the hemolymph esterase activities are observed whatever the sex and molt stage; the sex factor seems to be predominant for the esterase activities studied. Concurrently, a circadian rhythm of individual variabilities is observed for both sexes. The variabilities are assessed from the ratio of standard deviations on the esterase activity means, for each hour of experimentation. The minimum variabilities correspond to maximum total or specific esterase activities for the females whereas they precede the maximum esterase activities for males.
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