I have noticed, say over an eight hour period, the bite can be very sporatic with Zone chums. You can really be hittin'em for an hour or so then the bite dies off for 30-45 minutes. Then the bite is back on for 30 minutes then dies off for 20 minutes. Kind of weird. I would not worry about a "best time of day" for Zone chums. The Zone is good all day long for the most part. The best time of day for fisherman is at low tide.
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Carl C.