Abstract
1. The enzymes 5-hydroxytryptophan decarboxylase (5-HTPD) and monoamine oxidase (MAO) are present in the eyestalk of the fiddler crab, Uca pugilator. 2. Both enzymes exhibit 24-hr variation in their activities. 5-HTPD is most active at 13:00 hr in crabs maintained under a 13-hr photoperiod, lights on at 05:30 hr. MAO is most active at midnight under the same conditions. 3. These 24-hr variations are discussed in relation to the circadian rhythm of color change this crab exhibits. 4. MAO appears to be present either in more than a single form (isoenzymes) or as a single enzyme species with at least two active sites.
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